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Class Index

These are the API classes. See all API packages.

A

AbsSavedState A Parcelable implementation that should be used by inheritance hierarchies to ensure the state of all classes along the chain is saved. 
AbstractDetailsDescriptionPresenter An abstract Presenter for rendering a detailed description of an item. 
AbstractDetailsDescriptionPresenter.ViewHolder The ViewHolder for the AbstractDetailsDescriptionPresenter. 
AbstractMediaItemPresenter Abstract Presenter class for rendering media items in a playlist format. 
AbstractMediaItemPresenter.ViewHolder The ViewHolder for the AbstractMediaItemPresenter. 
AbstractMediaListHeaderPresenter Abstract presenter class for rendering the header for a list of media items in a playlist. 
AbstractMediaListHeaderPresenter.ViewHolder The ViewHolder for the AbstractMediaListHeaderPresenter. 
AbstractResolvableFuture<V> An AndroidX version of Guava's AbstractFuture. 
AbstractSavedStateVMFactory Skeleton of androidx.lifecycle.ViewModelProvider.KeyedFactory that creates SavedStateHandle for every requested ViewModel. 
AccessibilityClickableSpanCompat ClickableSpan cannot be parceled, but accessibility services need to be able to cause their callback handlers to be called. 
AccessibilityDelegateCompat Helper for accessing View.AccessibilityDelegate. 
AccessibilityEventCompat Helper for accessing features in AccessibilityEvent. 
AccessibilityManagerCompat Helper for accessing features in AccessibilityManager. 
AccessibilityManagerCompat.AccessibilityStateChangeListener This interface is deprecated. Use AccessibilityManager.AccessibilityStateChangeListener directly instead of this listener.  
AccessibilityManagerCompat.AccessibilityStateChangeListenerCompat This class is deprecated. Use AccessibilityManager.AccessibilityStateChangeListener directly instead of this listener.  
AccessibilityManagerCompat.TouchExplorationStateChangeListener Listener for the system touch exploration state. 
AccessibilityNodeInfoCompat Helper for accessing AccessibilityNodeInfo in a backwards compatible fashion. 
AccessibilityNodeInfoCompat.AccessibilityActionCompat A class defining an action that can be performed on an AccessibilityNodeInfo. 
AccessibilityNodeInfoCompat.CollectionInfoCompat Class with information if a node is a collection. 
AccessibilityNodeInfoCompat.CollectionItemInfoCompat Class with information if a node is a collection item. 
AccessibilityNodeInfoCompat.RangeInfoCompat Class with information if a node is a range. 
AccessibilityNodeProviderCompat Helper for accessing AccessibilityNodeProvider. 
AccessibilityRecordCompat Helper for accessing AccessibilityRecord. 
AccessibilityServiceInfoCompat Helper for accessing features in AccessibilityServiceInfo. 
AccessibilityViewCommand Functional interface used to create a custom accessibility action. 
AccessibilityViewCommand.CommandArguments Object containing arguments passed into an AccessibilityViewCommand  
AccessibilityViewCommand.MoveAtGranularityArguments Arguments for #ACTION_NEXT_AT_MOVEMENT_GRANULARITY and #ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY  
AccessibilityViewCommand.MoveHtmlArguments Arguments for AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT and #ACTION_PREVIOUS_HTML_ELEMENT  
AccessibilityViewCommand.MoveWindowArguments Arguments for #ACTION_MOVE_WINDOW  
AccessibilityViewCommand.ScrollToPositionArguments Arguments for #ACTION_SCROLL_TO_POSITION  
AccessibilityViewCommand.SetProgressArguments Arguments for #ACTION_SET_PROGRESS  
AccessibilityViewCommand.SetSelectionArguments Arguments for #ACTION_SET_SELECTION  
AccessibilityViewCommand.SetTextArguments Arguments for AccessibilityNodeInfoCompat.AccessibilityActionCompat.ACTION_SET_TEXT  
AccessibilityWindowInfoCompat Helper for accessing AccessibilityWindowInfo. 
Action An action contains one or two lines of text, an optional image and an optional id. 
ActionBar A primary toolbar within the activity that may display the activity title, application-level navigation affordances, and other interactive items. 
ActionBar.LayoutParams Per-child layout information associated with action bar custom views. 
ActionBar.OnMenuVisibilityListener Listener for receiving events when action bar menus are shown or hidden. 
ActionBar.OnNavigationListener This interface is deprecated. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBar.Tab This class is deprecated. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBar.TabListener This interface is deprecated. Action bar navigation modes are deprecated and not supported by inline toolbar action bars. Consider using other common navigation patterns instead.  
ActionBarDrawerToggle This class provides a handy way to tie together the functionality of DrawerLayout and the framework ActionBar to implement the recommended design for navigation drawers. 
ActionBarDrawerToggle This class provides a handy way to tie together the functionality of DrawerLayout and the framework ActionBar to implement the recommended design for navigation drawers. 
ActionBarDrawerToggle.Delegate  
ActionBarDrawerToggle.Delegate This interface is deprecated. Use ActionBarDrawerToggle.DelegateProvider in support-v7-appcompat.  
ActionBarDrawerToggle.DelegateProvider Allows an implementing Activity to return an ActionBarDrawerToggle.Delegate to use with ActionBarDrawerToggle. 
ActionBarDrawerToggle.DelegateProvider This interface is deprecated. Use ActionBarDrawerToggle.DelegateProvider in support-v7-appcompat.  
ActionListItem Class to build a list item that has up to two actions. 
ActionListItem.ViewHolder Holds the children views of ActionListItem. 
ActionMenuView ActionMenuView is a presentation of a series of menu options as a View. 
ActionMenuView.LayoutParams  
ActionMenuView.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
ActionMode Represents a contextual mode of the user interface. 
ActionMode.Callback Callback interface for action modes. 
ActionOnlyNavDirections An implementation of NavDirections without any arguments. 
ActionProvider This class is a mediator for accomplishing a given task, for example sharing a file. 
ActionProvider.VisibilityListener Listens to changes in visibility as reported by ActionProvider.refreshVisibility(). 
ActivityCompat Helper for accessing features in Activity. 
ActivityCompat This class is deprecated. Use androidx.core.app.ActivityCompat.  
ActivityCompat.OnRequestPermissionsResultCallback This interface is the contract for receiving the results for permission requests. 
ActivityCompat.PermissionCompatDelegate Customizable delegate that allows delegating permission compatibility methods to a custom implementation. 
ActivityInfoCompat This class is deprecated. Use ActivityInfo directly.  
ActivityManagerCompat Helper for accessing features in ActivityManager in a backwards compatible fashion. 
ActivityNavigator ActivityNavigator implements cross-activity navigation. 
ActivityNavigator.Destination NavDestination for activity navigation  
ActivityNavigator.Extras Extras that can be passed to ActivityNavigator to customize what ActivityOptionsCompat and flags are passed through to the call to ContextCompat.startActivity(Context, Intent, Bundle). 
ActivityNavigator.Extras.Builder Builder for constructing new ActivityNavigator.Extras instances. 
ActivityOptionsCompat Helper for accessing features in ActivityOptions in a backwards compatible fashion. 
AdapterListUpdateCallback ListUpdateCallback that dispatches update events to the given adapter. 
AlarmManagerCompat Compatibility library for AlarmManager with fallbacks for older platforms. 
AlertDialog A subclass of Dialog that can display one, two or three buttons. 
AlertDialog.Builder  
AlphaJumpAdapter An interface that you can implement on your Adapter to enable support for Alpha-Jump. 
AlphaJumpBucket A bucket represents a "button" in the alpha-jump menu. 
AlphaJumpBucketer A helper class for building the list of buckets for alpha jump. 
AlphaJumpBucketer.Bucket A basic implementation of AlphaJumpBucket. 
AlphaJumpOverlayView This view shows a grid of alphabetic letters that you can tap on to advance a list to the beginning of that list. 
AmbientMode This class is deprecated. please use AmbientModeSupport instead.  
AmbientMode.AmbientCallback Callback to receive ambient mode state changes. 
AmbientMode.AmbientCallbackProvider Interface for any Activity that wishes to implement Ambient Mode. 
AmbientMode.AmbientController A class for interacting with the ambient mode on a wearable device. 
AmbientModeSupport Use this as a headless Fragment to add ambient support to an Activity on Wearable devices. 
AmbientModeSupport.AmbientCallback Callback to receive ambient mode state changes. 
AmbientModeSupport.AmbientCallbackProvider Interface for any Activity that wishes to implement Ambient Mode. 
AmbientModeSupport.AmbientController A class for interacting with the ambient mode on a wearable device. 
AndroidViewModel Application context aware ViewModel. 
Animatable2Compat Interface that drawables supporting animations and callbacks should extend in support lib. 
Animatable2Compat.AnimationCallback Abstract class for animation callback. 
AnimatedStateListDrawableCompat A Drawable providing animated transitions between states. 
AnimatedVectorDrawableCompat For API 24 and above, this class is delegating to the framework's AnimatedVectorDrawable. 
AnimatorRes Denotes that an integer parameter, field or method return value is expected to be an animator resource reference (e.g. 
AnimRes Denotes that an integer parameter, field or method return value is expected to be an anim resource reference (e.g. 
AnyRes Denotes that an integer parameter, field or method return value is expected to be a resource reference of any type. 
AnyThread Denotes that the annotated method can be called from any thread (e.g. 
AppBarConfiguration Configuration options for NavigationUI methods that interact with implementations of the app bar pattern such as Toolbar, CollapsingToolbarLayout, and ActionBar. 
AppBarConfiguration.Builder The Builder class for constructing new AppBarConfiguration instances. 
AppBarConfiguration.OnNavigateUpListener Interface for providing custom 'up' behavior beyond what is provided by NavController.navigateUp(). 
AppCompatActivity Base class for activities that use the support library action bar features. 
AppCompatAutoCompleteTextView A AutoCompleteTextView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatButton A Button which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatCallback Implemented this in order for AppCompat to be able to callback in certain situations. 
AppCompatCheckBox A CheckBox which supports compatible features on older versions of the platform, including:
AppCompatCheckedTextView A CheckedTextView which supports compatible features on older versions of the platform. 
AppCompatDelegate This class represents a delegate which you can use to extend AppCompat's support to any Activity. 
AppCompatDialog Base class for AppCompat themed Dialogs. 
AppCompatDialogFragment A special version of DialogFragment which uses an AppCompatDialog in place of a platform-styled dialog. 
AppCompatEditText A EditText which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatImageButton A ImageButton which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatImageView A ImageView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatMultiAutoCompleteTextView A MultiAutoCompleteTextView which supports compatible features on older version of the platform, including:
AppCompatRadioButton A RadioButton which supports compatible features on older versions of the platform, including:
AppCompatRatingBar A RatingBar which supports compatible features on older versions of the platform. 
AppCompatResources Class for accessing an application's resources through AppCompat, and thus any backward compatible functionality. 
AppCompatSeekBar A SeekBar which supports compatible features on older versions of the platform. 
AppCompatSpinner A Spinner which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatTextView A TextView which supports compatible features on older versions of the platform, including:
  • Allows dynamic tint of its background via the background tint methods in ViewCompat. 
AppCompatToggleButton A ToggleButton which supports compatible features on older versions of the platform, including:

This will automatically be used when you use ToggleButton in your layouts. 

AppCompatViewInflater This class is responsible for manually inflating our tinted widgets. 
AppComponentFactory Version of AppComponentFactory that works with androidx libraries. 
AppLaunchChecker This class provides APIs for determining how an app has been launched. 
AppOpsManagerCompat Helper for accessing features in AppOpsManager. 
AppWidgetProviderWithCallbacks<T extends CallbackReceiver> Version of AppWidgetProvider that implements a CallbackReceiver. 
ArcMotion A PathMotion that generates a curved path along an arc on an imaginary circle containing the two points. 
ArrayCreatingInputMerger An InputMerger that attempts to merge the inputs, creating arrays when necessary. 
ArrayMap<K, V> ArrayMap is a generic key->value mapping data structure that is designed to be more memory efficient than a traditional HashMap, this implementation is a version of the platform's android.util.ArrayMap that can be used on older versions of the platform. 
ArrayObjectAdapter An ObjectAdapter implemented with an ArrayList. 
ArrayRes Denotes that an integer parameter, field or method return value is expected to be an array resource reference (e.g. 
ArraySet<E> ArraySet is a generic set data structure that is designed to be more memory efficient than a traditional HashSet. 
AsyncDifferConfig<T> Configuration object for ListAdapter, AsyncListDiffer, and similar background-thread list diffing adapter logic. 
AsyncDifferConfig.Builder<T> Builder class for AsyncDifferConfig. 
AsyncLayoutInflater

Helper class for inflating layouts asynchronously. 

AsyncLayoutInflater.OnInflateFinishedListener  
AsyncListDiffer<T> Helper for computing the difference between two lists via DiffUtil on a background thread. 
AsyncListDiffer.ListListener<T> Listener for when the current List is updated. 
AsyncListUtil<T> A utility class that supports asynchronous content loading. 
AsyncListUtil.DataCallback<T> The callback that provides data access for AsyncListUtil. 
AsyncListUtil.ViewCallback The callback that links AsyncListUtil with the list view. 
AsyncPagedListDiffer<T> Helper object for mapping a PagedList into a RecyclerView.Adapter. 
AsyncPagedListDiffer.PagedListListener<T> Listener for when the current PagedList is updated. 
AsyncTaskLoader<D> Static library support version of the framework's AsyncTaskLoader. 
AtomicFile Static library support version of the framework's AtomicFile, a helper class for performing atomic operations on a file by creating a backup file until a write has successfully completed. 
AttrRes Denotes that an integer parameter, field or method return value is expected to be an attribute reference (e.g. 
AudioAttributesCompat A class to encapsulate a collection of attributes describing information about an audio stream. 
AudioAttributesCompat.Builder Builder class for AudioAttributesCompat objects. 
AudioFocusRequestCompat Compatibility version of an AudioFocusRequest. 
AudioFocusRequestCompat.Builder Builder class for AudioFocusRequestCompat objects. 
AudioManagerCompat Compatibility library for AudioManager with fallbacks for older platforms. 
AutoScrollHelper AutoScrollHelper is a utility class for adding automatic edge-triggered scrolling to Views. 
AutoTransition Utility class for creating a default transition that automatically fades, moves, and resizes views during a scene change. 

B

BackgroundManager Supports background image continuity between multiple Activities. 
BackoffPolicy An enumeration of backoff policies when retrying work. 
BandPredicate Provides a means of controlling when and where band selection can be initiated. 
BandPredicate.EmptyArea A BandPredicate that allows initiation of band selection only in areas of RecyclerView that map to RecyclerView.NO_POSITION. 
BandPredicate.NonDraggableArea A BandPredicate that allows initiation of band selection in any area that is not draggable as determined by consulting ItemDetailsLookup.ItemDetails.inDragRegion(MotionEvent). 
BaseCardView A card style layout that responds to certain state changes. 
BaseCardView.LayoutParams Per-child layout information associated with BaseCardView. 
BaseFragment This class is deprecated. use BaseSupportFragment  
BaseGridView An abstract base class for vertically and horizontally scrolling lists. 
BaseGridView.OnKeyInterceptListener Listener for intercepting key dispatch events. 
BaseGridView.OnMotionInterceptListener Listener for intercepting generic motion dispatch events. 
BaseGridView.OnTouchInterceptListener Listener for intercepting touch dispatch events. 
BaseGridView.OnUnhandledKeyListener  
BaseLeanbackPreferenceFragment This class is deprecated. Use BaseLeanbackPreferenceFragmentCompat  
BaseLeanbackPreferenceFragmentCompat This fragment provides a preference fragment with leanback-style behavior, suitable for embedding into broader UI elements. 
BaseOnItemViewClickedListener<T> Interface for receiving notification when an item view holder is clicked. 
BaseOnItemViewSelectedListener<T> Interface for receiving notification when a row or item becomes selected. 
BaseSupportFragment Base class for leanback Fragments. 
BatchingListUpdateCallback Wraps a ListUpdateCallback callback and batches operations that can be merged. 
BidiFormatter Utility class for formatting text for display in a potentially opposite-directionality context without garbling. 
BidiFormatter.Builder A class for building a BidiFormatter with non-default options. 
BinderThread Denotes that the annotated method should only be called on the binder thread. 
BiometricPrompt A class that manages a system-provided biometric prompt. 
BiometricPrompt.AuthenticationCallback Callback structure provided to BiometricPrompt. 
BiometricPrompt.AuthenticationResult Container for callback data from BiometricPrompt.authenticate(PromptInfo) and BiometricPrompt.authenticate(PromptInfo, CryptoObject). 
BiometricPrompt.CryptoObject A wrapper class for the crypto objects supported by BiometricPrompt. 
BiometricPrompt.PromptInfo A class that contains a builder which returns the BiometricPrompt.PromptInfo to be used in BiometricPrompt.authenticate(PromptInfo, CryptoObject) and BiometricPrompt.authenticate(PromptInfo). 
BiometricPrompt.PromptInfo.Builder A builder that collects arguments to be shown on the system-provided biometric dialog. 
BitmapCompat Helper for accessing features in Bitmap. 
BoolRes Denotes that an integer parameter, field or method return value is expected to be a boolean resource reference. 
BoundaryInterfaceReflectionUtil A set of utility methods used for calling across the support library boundary. 
BoundsRule This class contains the rules for updating the bounds of a CompositeDrawable.ChildDrawable. 
BoundsRule.ValueRule This class represents individual rules for updating the bounds. 
BoxInsetLayout BoxInsetLayout is a screen shape-aware ViewGroup that can box its children in the center square of a round screen by using the boxedEdges attribute. 
BoxInsetLayout.LayoutParams Per-child layout information for layouts that support margins, gravity and boxedEdges. 
BrandedFragment This class is deprecated. use BrandedSupportFragment  
BrandedSupportFragment Fragment class for managing search and branding using a view that implements TitleViewAdapter.Provider. 
BroadcastReceiverWithCallbacks<T extends CallbackReceiver> Extend this broadcast receiver to be able to receive callbacks as well as normal broadcasts. 
BrowseFragment This class is deprecated. use BrowseSupportFragment  
BrowseFragment.BrowseTransitionListener This class is deprecated. use BrowseSupportFragment  
BrowseFragment.FragmentFactory<T extends Fragment> This class is deprecated. use BrowseSupportFragment  
BrowseFragment.FragmentHost This interface is deprecated. use BrowseSupportFragment  
BrowseFragment.ListRowFragmentFactory This class is deprecated. use BrowseSupportFragment  
BrowseFragment.MainFragmentAdapter<T extends Fragment> This class is deprecated. use BrowseSupportFragment  
BrowseFragment.MainFragmentAdapterProvider This interface is deprecated. use BrowseSupportFragment  
BrowseFragment.MainFragmentAdapterRegistry This class is deprecated. use BrowseSupportFragment  
BrowseFragment.MainFragmentRowsAdapter<T extends Fragment> This class is deprecated. use BrowseSupportFragment  
BrowseFragment.MainFragmentRowsAdapterProvider This interface is deprecated. use BrowseSupportFragment  
BrowseFrameLayout A ViewGroup for managing focus behavior between overlapping views. 
BrowseFrameLayout.OnChildFocusListener Interface for managing child focus in a BrowseFrameLayout. 
BrowseFrameLayout.OnFocusSearchListener Interface for selecting a focused view in a BrowseFrameLayout when the system focus finder couldn't find a view to focus. 
BrowserActionItem A wrapper class holding custom item of Browser Actions menu. 
BrowserActionsIntent Class holding the Intent and start bundle for a Browser Actions Activity. 
BrowserActionsIntent.Builder Builder class for opening a Browser Actions context menu. 
BrowseSupportFragment A fragment for creating Leanback browse screens. 
BrowseSupportFragment.BrowseTransitionListener Listener for transitions between browse headers and rows. 
BrowseSupportFragment.FragmentFactory<T extends Fragment> Factory class responsible for creating fragment given the current item. 
BrowseSupportFragment.FragmentHost Possible set of actions that BrowseSupportFragment exposes to clients. 
BrowseSupportFragment.ListRowFragmentFactory FragmentFactory implementation for ListRow. 
BrowseSupportFragment.MainFragmentAdapter<T extends Fragment> Interface that defines the interaction between BrowseSupportFragment and its main content fragment. 
BrowseSupportFragment.MainFragmentAdapterProvider Interface to be implemented by all fragments for providing an instance of BrowseSupportFragment.MainFragmentAdapter. 
BrowseSupportFragment.MainFragmentAdapterRegistry Registry class maintaining the mapping of Row subclasses to BrowseSupportFragment.FragmentFactory. 
BrowseSupportFragment.MainFragmentRowsAdapter<T extends Fragment> This is used to pass information to RowsSupportFragment or its subclasses. 
BrowseSupportFragment.MainFragmentRowsAdapterProvider Interface to be implemented by RowsSupportFragment and its subclasses for providing an instance of BrowseSupportFragment.MainFragmentRowsAdapter. 
BuildCompat This class contains additional platform version checking methods for targeting pre-release versions of Android. 
BundleCompat Helper for accessing features in Bundle. 
BundledEmojiCompatConfig EmojiCompat.Config implementation that loads the metadata using AssetManager and bundled resources. 

C

CallableMethod  
CallbackHandlerRegistry The holder for callbacks that are tagged with RemoteCallable. 
CallbackHandlerRegistry.CallbackHandler<T extends CallbackReceiver> The interface used to trigger a callback when the pending intent is fired. 
CallbackMediaItem Structure for media item descriptor for DataSourceCallback. 
CallbackMediaItem.Builder This Builder class simplifies the creation of a CallbackMediaItem object. 
CallbackReceiver<T> An objects that can receive remote callbacks. 
CallbackReceiver Holder class that is created for each class instance that is a CallbackReceiver and has methods tagged with @RemoteCallable. 
CallbackToFutureAdapter A utility that provides safety checks as an alternative to ResolvableFuture, failing the future if it will never complete. 
CallbackToFutureAdapter.Completer<T> Used to complete the future returned by CallbackToFutureAdapter.getFuture(CallbackToFutureAdapter.Resolver)  
CallbackToFutureAdapter.Resolver<T> Called by CallbackToFutureAdapter.getFuture(CallbackToFutureAdapter.Resolver). 
CallSuper Denotes that any overriding methods should invoke this method as well. 
Cancellable Token representing a cancellable operation. 
CancellationSignal Static library support version of the framework's CancellationSignal. 
CancellationSignal.OnCancelListener Listens for cancellation. 
CarAlertDialog A subclass of Dialog that is tailored for the car environment. 
CarAlertDialog.Builder Builder class that can be used to create a CarAlertDialog by configuring the options for what shows up in the resulting dialog. 
CarDrawerAdapter Base adapter for displaying items in the car navigation drawer, which uses a PagedListView. 
CarDrawerController A controller that will handle the set up of the navigation drawer. 
CardView A FrameLayout with a rounded corner background and shadow. 
CarListDialog A subclass of Dialog that is tailored for the car environment. 
CarListDialog.Builder Builder class that can be used to create a CarListDialog by configuring the options for the list and behavior of the dialog. 
CarListDialog.DialogSubSection A struct that holds data for a section. 
CarMenuItem Class to build a CarMenuItem that appears in the CarToolbar menu. 
CarMenuItem.Builder Builder for creating a CarMenuItem  
CarMenuItem.DisplayBehavior Display behaviors for CarMenuItems. 
CarMenuItem.OnClickListener Interface definition for a callback to be invoked when a CarMenuItem is clicked. 
CarToolbar A toolbar for building car applications. 
CarUxRestrictions Car UX Restrictions event. 
CarUxRestrictions.Builder Builder class for CarUxRestrictions  
CarUxRestrictionsHelper Helps registering OnUxRestrictionsChangedListener and managing car connection. 
ChangeBounds This transition captures the layout bounds of target views before and after the scene change and animates those changes during the transition. 
ChangeClipBounds ChangeClipBounds captures the View.getClipBounds() before and after the scene change and animates those changes during the transition. 
ChangeImageTransform This Transition captures an ImageView's matrix before and after the scene change and animates it during the transition. 
ChangeScroll This transition captures the scroll properties of targets before and after the scene change and animates any changes. 
ChangeTransform This Transition captures scale and rotation for Views before and after the scene change and animates those changes during the transition. 
Channel A convenience class to access TvContractCompat.Channels entries in the system content provider. 
Channel.Builder The builder class that makes it easy to chain setters to create a Channel object. 
ChannelLogoUtils A utility class for conveniently storing and loading channel logos. 
CheckBoxPreference A Preference that provides checkbox widget functionality. 
CheckResult Denotes that the annotated method returns a result that it typically is an error to ignore. 
CircularArray<E> CircularArray is a generic circular array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
CircularIntArray CircularIntArray is a circular integer array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
CircularProgressDrawable Drawable that renders the animated indeterminate progress indicator in the Material design style without depending on API level 11. 
CircularProgressLayout CircularProgressLayout adds a circular countdown timer behind the view it contains, typically used to automatically confirm an operation after a short delay has elapsed. 
CircularProgressLayout.OnTimerFinishedListener Interface to implement for listening to onTimerFinished(CircularProgressLayout) event. 
CircularPropagation A propagation that varies with the distance to the epicenter of the Transition or center of the scene if no epicenter exists. 
ClassPresenterSelector A ClassPresenterSelector selects a Presenter based on the item's Java class. 
CollapsibleActionView When a View implements this interface it will receive callbacks when expanded or collapsed as an action view alongside the optional, app-specified callbacks to MenuItemCompat.OnActionExpandListener. 
ColorFilterCache Cache of ColorFilters for a given color at different alpha levels. 
ColorFilterDimmer Helper class for applying a dim level to a View. 
ColorInt Denotes that the annotated element represents a packed color int, AARRGGBB. 
ColorLong

Denotes that the annotated element represents a packed color long. 

ColorOverlayDimmer Helper class for assigning a dim color to Paint. 
ColorRes Denotes that an integer parameter, field or method return value is expected to be a color resource reference (e.g. 
ColorUtils A set of color-related utility methods, building upon those available in Color. 
ColumnCalculator Utility class that calculates the width of the columns that will fit on the screen. 
ColumnCardView A CardView whose width can be specified by the number of columns that it will span. 
ColumnInfo Allows specific customization about the column associated with this field. 
ColumnInfo.Collate  
ColumnInfo.SQLiteTypeAffinity The SQLite column type constants that can be used in ColumnInfo.typeAffinity()  
ComponentActivity Base class for activities that enables composition of higher level components. 
CompositeDrawable Generic drawable class that can be composed of multiple children. 
CompositeDrawable.ChildDrawable Wrapper class holding a drawable object and BoundsRule to update drawable bounds when parent bound changes. 
CompoundButtonCompat Helper for accessing CompoundButton. 
Configuration The Configuration object used to customize WorkManager upon initialization. 
Configuration.Builder A Builder for Configurations. 
ConfigurationCompat Helper class which allows access to properties of Configuration in a backward compatible fashion. 
ConfigurationHelper Helper class which allows access to properties of Configuration in a backward compatible fashion. 
ConfirmationActivity This Activity is used to display confirmation animations after the user completes an action on the wearable. 
ConfirmationOverlay Displays a full-screen confirmation animation with optional text and then hides it. 
ConfirmationOverlay.OnAnimationFinishedListener Interface for listeners to be notified when the ConfirmationOverlay animation has finished and its View has been removed. 
ConfirmationOverlay.OverlayType Types of animations to display in the overlay. 
ConnectivityManagerCompat Helper for accessing features in ConnectivityManager. 
Constraints A specification of the requirements that need to be met before a WorkRequest can run. 
Constraints.Builder A Builder for a Constraints object. 
Consumer<T> Compat version of Consumer 
ContentLoadingProgressBar ContentLoadingProgressBar implements a ProgressBar that waits a minimum time to be dismissed before showing. 
ContentPager ContentPager provides support for loading "paged" data on a background thread using the ContentResolver framework. 
ContentPager.ContentCallback Callback by which a client receives results of a query. 
ContentPager.CursorDisposition  
ContentPager.QueryRunner Implementations of this interface provide the mechanism for execution of queries off the UI thread. 
ContentPager.QueryRunner.Callback Callback that receives a cursor once a query as been executed on the Runner. 
ContentProviderWithCallbacks<T extends ContentProviderWithCallbacks> Version of ContentProvider that can be used as a CallbackReceiver. 
ContentRecommendation The ContentRecommendation object encapsulates all application provided data for a single content recommendation item. 
ContentRecommendation.Builder Builder class for ContentRecommendation objects. 
ContentRecommendation.ContentMaturity  
ContentRecommendation.ContentPricing  
ContentRecommendation.ContentStatus  
ContentRecommendation.ContentType  
ContentRecommendation.IntentData Object used to encapsulate the data to be used to build the PendingIntent object associated with a given content recommendation, at the time this recommendation gets posted to the home Screen. 
ContentRecommendation.IntentType  
ContentResolverCompat Helper for accessing features in ContentResolver in a backwards compatible fashion. 
ContentView Annotation that can be attached to a constructor with a single LayoutRes parameter to denote what layout the component intends to inflate and set as its content. 
ContextCompat Helper for accessing features in Context. 
ContextThemeWrapper A context wrapper that allows you to modify or replace the theme of the wrapped context. 
ControlButtonPresenterSelector Displays primary and secondary controls for a PlaybackControlsRow. 
CoordinatorLayout CoordinatorLayout is a super-powered FrameLayout. 
CoordinatorLayout.AttachedBehavior Defines the default attached CoordinatorLayout.Behavior of a View class

When writing a custom view, implement this interface to return the default behavior when used as a direct child of an CoordinatorLayout. 

CoordinatorLayout.Behavior<V extends View> Interaction behavior plugin for child views of CoordinatorLayout. 
CoordinatorLayout.DefaultBehavior This @interface is deprecated. Use CoordinatorLayout.AttachedBehavior instead  
CoordinatorLayout.LayoutParams Parameters describing the desired layout for a child of a CoordinatorLayout. 
CoordinatorLayout.SavedState  
CountingTaskExecutorRule A JUnit Test Rule that swaps the background executor used by the Architecture Components with a different one which counts the tasks as they are start and finish. 
CursorAdapter Static library support version of the framework's CursorAdapter. 
CursorLoader Static library support version of the framework's CursorLoader. 
CursorMapper Abstract class used to convert the current Cursor row to a single object. 
CursorObjectAdapter An ObjectAdapter implemented with a Cursor. 
CursorWindowCompat Helper for accessing features in CursorWindow  
CurvingLayoutCallback An implementation of the WearableLinearLayoutManager.LayoutCallback aligning the children of the associated WearableRecyclerView along a pre-defined vertical curve. 
CustomTabsCallback A callback class for custom tabs client to get messages regarding events in their custom tabs. 
CustomTabsClient Class to communicate with a CustomTabsService and create CustomTabsSession from it. 
CustomTabsIntent Class holding the Intent and start bundle for a Custom Tabs Activity. 
CustomTabsIntent.Builder Builder class for CustomTabsIntent objects. 
CustomTabsService Abstract service class for implementing Custom Tabs related functionality. 
CustomTabsService.Relation  
CustomTabsService.Result  
CustomTabsServiceConnection Abstract ServiceConnection to use while binding to a CustomTabsService. 
CustomTabsSession A class to be used for Custom Tabs related communication. 
CustomTabsSessionToken Wrapper class that can be used as a unique identifier for a session. 

D

Dao Marks the class as a Data Access Object. 
Data A persistable set of key/value pairs which are used as inputs and outputs for ListenableWorkers. 
Data.Builder A builder for Data objects. 
Database Marks a class as a RoomDatabase. 
DatabaseConfiguration Configuration class for a RoomDatabase. 
DatabaseUtilsCompat This class is deprecated. Use DatabaseUtils directly.  
DatabaseView Marks a class as an SQLite view. 
DataSource<Key, Value> Base class for loading pages of snapshot data into a PagedList. 
DataSource.Factory<Key, Value> Factory for DataSources. 
DataSource.InvalidatedCallback Invalidation callback for DataSource. 
DataSourceCallback For supplying media data, implement this if your app has special requirements for the way media data is obtained. 
DatePicker DatePicker is a directly subclass of Picker. 
DefaultItemAnimator This implementation of RecyclerView.ItemAnimator provides basic animations on remove, add, and move events that happen to the items in a RecyclerView. 
DefaultLifecycleObserver Callback interface for listening to LifecycleOwner state changes. 
Delete Marks a method in a Dao annotated class as a delete method. 
Destination Final or intermediate stop in a navigation route. 
Destination.Builder Builder for creating a Destination  
Destination.Traffic Congestion level on the way to a destination, compared to ideal driving conditions. 
DetailsFragment This class is deprecated. use DetailsSupportFragment  
DetailsFragmentBackgroundController This class is deprecated. use DetailsSupportFragmentBackgroundController  
DetailsOverviewLogoPresenter Presenter that responsible to create a ImageView and bind to DetailsOverviewRow. 
DetailsOverviewLogoPresenter.ViewHolder ViewHolder for Logo view of DetailsOverviewRow. 
DetailsOverviewRow An overview Row for a details fragment. 
DetailsOverviewRow.Listener Listener for changes of DetailsOverviewRow. 
DetailsOverviewRowPresenter This class is deprecated. Use FullWidthDetailsOverviewRowPresenter  
DetailsOverviewRowPresenter.ViewHolder A ViewHolder for the DetailsOverviewRow. 
DetailsParallax Subclass of Parallax object that tracks overview row's top and bottom edge in DetailsFragment or DetailsSupportFragment. 
DetailsSupportFragment A fragment for creating Leanback details screens. 
DetailsSupportFragmentBackgroundController Controller for DetailsSupportFragment parallax background and embedded video play. 
DialogCompat Helper for accessing features in Dialog in a backwards compatible fashion. 
DialogFragment Static library support version of the framework's DialogFragment. 
DialogPreference A base class for Preferences that are dialog-based. 
DialogPreference.TargetFragment Interface for PreferenceFragmentCompats to implement to allow DialogPreferences to find the preference that launched the dialog. 
DiffCallback<Value> Callback that informs ArrayObjectAdapter how to compute list updates when using DiffUtil in ArrayObjectAdapter.setItems(List, DiffCallback) method. 
DiffUtil DiffUtil is a utility class that calculates the difference between two lists and outputs a list of update operations that converts the first list into the second one. 
DiffUtil.Callback A Callback class used by DiffUtil while calculating the diff between two lists. 
DiffUtil.DiffResult This class holds the information about the result of a DiffUtil.calculateDiff(Callback, boolean) call. 
DiffUtil.ItemCallback<T> Callback for calculating the diff between two non-null items in a list. 
DimenRes Denotes that an integer parameter, field or method return value is expected to be a dimension resource reference (e.g. 
Dimension Denotes that an integer parameter, field or method return value is expected to represent a dimension. 
DisplayCutoutCompat Represents the area of the display that is not functional for displaying content. 
DisplayManagerCompat Helper for accessing features in DisplayManager. 
Distance Distance along the planned route between relevant points in the navigation  
Distance.Unit Possible units used to display this distance. 
DividerItemDecoration DividerItemDecoration is a RecyclerView.ItemDecoration that can be used as a divider between items of a LinearLayoutManager. 
DividerPresenter DividerPresenter provides a default presentation for DividerRow in HeadersFragment. 
DividerRow Used to represent divider in HeadersFragment. 
DocumentFile Representation of a document backed by either a DocumentsProvider or a raw file on disk. 
DragAndDropPermissionsCompat Helper for accessing features in DragAndDropPermissions a backwards compatible fashion. 
DragStartHelper DragStartHelper is a utility class for implementing drag and drop support. 
DragStartHelper.OnDragStartListener Interface definition for a callback to be invoked when a drag start gesture is detected. 
DrawableCompat Helper for accessing features in Drawable. 
DrawableRes Denotes that an integer parameter, field or method return value is expected to be a drawable resource reference (e.g. 
DrawerArrowDrawable A drawable that can draw a "Drawer hamburger" menu or an arrow and animate between them. 
DrawerItemViewHolder Re-usable RecyclerView.ViewHolder for displaying items in the CarDrawerAdapter. 
DrawerLayout DrawerLayout acts as a top-level container for window content that allows for interactive "drawer" views to be pulled out from one or both vertical edges of the window. 
DrawerLayout.DrawerListener Listener for monitoring events about drawers. 
DrawerLayout.LayoutParams  
DrawerLayout.SavedState State persisted across instances  
DrawerLayout.SimpleDrawerListener Stub/no-op implementations of all methods of DrawerLayout.DrawerListener. 
DropDownPreference A ListPreference that presents the options in a drop down menu rather than a dialog. 
DynamicAnimation<T extends DynamicAnimation<T>> This class is the base class of physics-based animations. 
DynamicAnimation.OnAnimationEndListener An animation listener that receives end notifications from an animation. 
DynamicAnimation.OnAnimationUpdateListener Implementors of this interface can add themselves as update listeners to an DynamicAnimation instance to receive callbacks on every animation frame, after the current frame's values have been calculated for that DynamicAnimation. 
DynamicAnimation.ViewProperty ViewProperty holds the access of a property of a View. 

E

EdgeEffectCompat Helper for accessing EdgeEffect. 
EditorInfoCompat Helper for accessing features in EditorInfo in a backwards compatible fashion. 
EditTextPreference A DialogPreference that shows a EditText in the dialog. 
EditTextPreference.OnBindEditTextListener Interface definition for a callback to be invoked when the corresponding dialog view for this preference is bound. 
EditTextPreference.SimpleSummaryProvider A simple Preference.SummaryProvider implementation for an EditTextPreference. 
EditTextPreferenceDialogFragment This class is deprecated. Use EditTextPreferenceDialogFragmentCompat instead  
EditTextPreferenceDialogFragmentCompat  
Embedded Can be used as an annotation on a field of an Entity or Pojo to signal that nested fields (i.e. 
EmojiAppCompatButton AppCompatButton widget enhanced with emoji capability by using EmojiTextViewHelper. 
EmojiAppCompatEditText AppCompatEditText widget enhanced with emoji capability by using EmojiEditTextHelper. 
EmojiAppCompatTextView AppCompatTextView widget enhanced with emoji capability by using EmojiTextViewHelper. 
EmojiButton Button widget enhanced with emoji capability by using EmojiTextViewHelper. 
EmojiCompat Main class to keep Android devices up to date with the newest emojis by adding EmojiSpans to a given CharSequence. 
EmojiCompat.Config Configuration class for EmojiCompat. 
EmojiCompat.InitCallback Listener class for the initialization of the EmojiCompat. 
EmojiCompat.MetadataRepoLoader Interface to load emoji metadata. 
EmojiCompat.MetadataRepoLoaderCallback Callback to inform EmojiCompat about the state of the metadata load. 
EmojiEditText EditText widget enhanced with emoji capability by using EmojiEditTextHelper. 
EmojiEditTextHelper Utility class to enhance custom EditText widgets with EmojiCompat. 
EmojiExtractTextLayout Layout that contains emoji compatibility enhanced ExtractEditText. 
EmojiSpan Base span class for the emoji replacement. 
EmojiTextView TextView widget enhanced with emoji capability by using EmojiTextViewHelper. 
EmojiTextViewHelper Utility class to enhance custom TextView widgets with EmojiCompat. 
EmptyResultSetException Thrown by Room when the query needs to return a result (e.g. 
Entity Marks a class as an entity. 
EnvironmentCompat Helper for accessing features in Environment. 
ErrorFragment This class is deprecated. use ErrorSupportFragment  
ErrorSupportFragment A fragment for displaying an error indication. 
EventInfo Represents information associated with a logged event on SliceView. 
ExifInterface This is a class for reading and writing Exif tags in a JPEG file or a RAW image file. 
ExistingPeriodicWorkPolicy An enumeration of the conflict resolution policies available to unique PeriodicWorkRequests in case of a collision. 
ExistingWorkPolicy An enumeration of the conflict resolution policies available to unique OneTimeWorkRequests in case of a collision. 
Explode This transition tracks changes to the visibility of target views in the start and end scenes and moves views in or out from the edges of the scene. 
ExploreByTouchHelper ExploreByTouchHelper is a utility class for implementing accessibility support in custom Views that represent a collection of View-like logical items. 
ExternalInput Identifies parameters of an RemoteCallable that will be pulled from the caller of the callback. 

F

FacetProvider This is the query interface to supply optional features(aka facets) on an object without the need of letting the object to subclass or implement java interfaces. 
FacetProviderAdapter Optional interface that implemented by RecyclerView.Adapter to query FacetProvider for a given type within Adapter. 
Fade This transition tracks changes to the visibility of target views in the start and end scenes and fades views in or out when they become visible or non-visible. 
FastOutLinearInInterpolator Interpolator corresponding to R.interpolator.fast_out_linear_in. 
FastOutSlowInInterpolator Interpolator corresponding to R.interpolator.fast_out_slow_in. 
Features Class containing all the features the support library can support. 
FileMediaItem Structure for media item for a file. 
FileMediaItem.Builder This Builder class simplifies the creation of a FileMediaItem object. 
FileProvider FileProvider is a special subclass of ContentProvider that facilitates secure sharing of files associated with an app by creating a content:// Uri for a file instead of a file:/// Uri. 
FingerprintManagerCompat This class is deprecated. Use androidx.biometrics.BiometricPrompt instead.  
FingerprintManagerCompat.AuthenticationCallback Callback structure provided to FingerprintManagerCompat.authenticate(CryptoObject, int, CancellationSignal, AuthenticationCallback, Handler). 
FingerprintManagerCompat.AuthenticationResult Container for callback data from FingerprintManagerCompat.authenticate(CryptoObject, int, CancellationSignal, AuthenticationCallback, Handler). 
FingerprintManagerCompat.CryptoObject A wrapper class for the crypto objects supported by FingerprintManager. 
FitWidthBitmapDrawable Subclass of Drawable that can be used to draw a bitmap into a region. 
FlingAnimation

Fling animation is an animation that continues an initial momentum (most often from gesture velocity) and gradually slows down. 

FloatPropertyCompat<T>

FloatPropertyCompat is an abstraction that can be used to represent a mutable float value that is held in a host object. 

FloatRange Denotes that the annotated element should be a float or double in the given range

Example: 


  @FloatRange(from=0.0,to=1.0)
  public float getAlpha() {
      ... 
FloatValueHolder

FloatValueHolder holds a float value. 

FocusDelegate<K> Override methods in this class to provide application specific behaviors related to focusing item. 
FocusHighlight Interface for highlighting the item that has focus. 
FocusHighlightHelper Sets up the highlighting behavior when an item gains focus. 
FontRequest Information about a font request that may be sent to a Font Provider. 
FontRequestEmojiCompatConfig EmojiCompat.Config implementation that asynchronously fetches the required font and the metadata using a FontRequest. 
FontRequestEmojiCompatConfig.ExponentialBackoffRetryPolicy A retry policy implementation that doubles the amount of time in between retries. 
FontRequestEmojiCompatConfig.RetryPolicy Retry policy used when the font provider is not ready to give the font file. 
FontRes Denotes that an integer parameter, field or method return value is expected to be a font resource reference (e.g. 
FontsContractCompat Utility class to deal with Font ContentProviders. 
FontsContractCompat.Columns Defines the constants used in a response from a Font Provider. 
FontsContractCompat.FontFamilyResult Object returned from FontsContractCompat.fetchFonts(Context, CancellationSignal, FontRequest). 
FontsContractCompat.FontInfo Object represent a font entry in the family returned from FontsContractCompat.fetchFonts(Context, CancellationSignal, FontRequest). 
FontsContractCompat.FontRequestCallback Interface used to receive asynchronously fetched typefaces. 
ForeignKey Declares a foreign key on another Entity. 
ForeignKey.Action Constants definition for values that can be used in ForeignKey.onDelete() and ForeignKey.onUpdate(). 
FractionRes Denotes that an integer parameter, field or method return value is expected to be a fraction resource reference. 
Fragment Static library support version of the framework's Fragment. 
Fragment.InstantiationException Thrown by FragmentFactory.instantiate(ClassLoader, String) when there is an instantiation failure. 
Fragment.SavedState State information that has been retrieved from a fragment instance through FragmentManager.saveFragmentInstanceState. 
FragmentActivity Base class for activities that want to use the support-based Fragments. 
FragmentAnimationProvider FragmentAnimationProvider supplies animations for use during a fragment's onCreateAnimator callback. 
FragmentCompat This class is deprecated. Use Fragment instead of the framework fragment.  
FragmentCompat.OnRequestPermissionsResultCallback This interface is deprecated. Use Fragment instead of the framework Fragment.  
FragmentCompat.PermissionCompatDelegate This interface is deprecated. Use Fragment instead of the framework Fragment.  
FragmentContainer Callbacks to a Fragment's container. 
FragmentController Provides integration points with a FragmentManager for a fragment host. 
FragmentFactory Interface used to control the instantiation of Fragment instances. 
FragmentHostCallback<E> Integration points with the Fragment host. 
FragmentManager Static library support version of the framework's FragmentManager. 
FragmentManager.BackStackEntry Representation of an entry on the fragment back stack, as created with FragmentTransaction.addToBackStack(). 
FragmentManager.FragmentLifecycleCallbacks Callback interface for listening to fragment state changes that happen within a given FragmentManager. 
FragmentManager.OnBackStackChangedListener Interface to watch for changes to the back stack. 
FragmentManagerNonConfig This class is deprecated. Have your FragmentHostCallback implement ViewModelStoreOwner to automatically retain the Fragment's non configuration state.  
FragmentNavigator Navigator that navigates through fragment transactions. 
FragmentNavigator.Destination NavDestination specific to FragmentNavigator  
FragmentNavigator.Extras Extras that can be passed to FragmentNavigator to enable Fragment specific behavior  
FragmentNavigator.Extras.Builder Builder for constructing new FragmentNavigator.Extras instances. 
FragmentPagerAdapter Implementation of PagerAdapter that represents each page as a Fragment that is persistently kept in the fragment manager as long as the user can return to the page. 
FragmentPagerAdapter This class is deprecated. Use FragmentPagerAdapter instead.  
FragmentScenario<F extends Fragment> FragmentScenario provides API to start and drive a Fragment's lifecycle state for testing. 
FragmentScenario.FragmentAction<F extends Fragment> FragmentAction interface should be implemented by any class whose instances are intended to be executed by the main thread. 
FragmentStateAdapter Similar in behavior to FragmentStatePagerAdapter

Lifecycle within RecyclerView:

FragmentStatePagerAdapter Implementation of PagerAdapter that uses a Fragment to manage each page. 
FragmentStatePagerAdapter This class is deprecated. Use FragmentStatePagerAdapter instead.  
FragmentTabHost This class is deprecated. Use TabLayout and ViewPager instead.  
FragmentTabHost This class is deprecated. Use FragmentTabHost instead.  
FragmentTransaction Static library support version of the framework's FragmentTransaction. 
FragmentViewHolder RecyclerView.ViewHolder implementation for handling Fragments. 
FrameMetricsAggregator This class can be used to record and return data about per-frame durations. 
FrameworkSQLiteOpenHelperFactory Implements SupportSQLiteOpenHelper.Factory using the SQLite implementation in the framework. 
Fts3 Marks an Entity annotated class as a FTS3 entity. 
Fts4 Marks an Entity annotated class as a FTS4 entity. 
FtsOptions Available option values that can be used with Fts3 & Fts4. 
FtsOptions.MatchInfo  
FtsOptions.Order  
FullWidthDetailsOverviewRowPresenter Renders a DetailsOverviewRow to display an overview of an item. 
FullWidthDetailsOverviewRowPresenter.Listener Listeners for events on ViewHolder. 
FullWidthDetailsOverviewRowPresenter.ViewHolder A ViewHolder for the DetailsOverviewRow. 
FullWidthDetailsOverviewRowPresenter.ViewHolder.DetailsOverviewRowListener  
FullWidthDetailsOverviewSharedElementHelper Helper class to assist delayed shared element activity transition for view created by FullWidthDetailsOverviewRowPresenter. 
Function<I, O> Represents a function. 

G

GestureDetectorCompat Detects various gestures and events using the supplied MotionEvents. 
GravityCompat Compatibility shim for accessing newer functionality from Gravity. 
GridLayout A layout that places its children in a rectangular grid. 
GridLayout.Alignment Alignments specify where a view should be placed within a cell group and what size it should be. 
GridLayout.LayoutParams Layout information associated with each of the children of a GridLayout. 
GridLayout.Spec A Spec defines the horizontal or vertical characteristics of a group of cells. 
GridLayoutManager A RecyclerView.LayoutManager implementations that lays out items in a grid. 
GridLayoutManager.DefaultSpanSizeLookup Default implementation for GridLayoutManager.SpanSizeLookup. 
GridLayoutManager.LayoutParams LayoutParams used by GridLayoutManager. 
GridLayoutManager.SpanSizeLookup A helper class to provide the number of spans each item occupies. 
GridRowBuilder Builder to construct a grid row which may be added as a row to ListBuilder. 
GridRowBuilder.CellBuilder Builder to construct a cell. 
GuardedBy Denotes that the annotated method or field can only be accessed when holding the referenced lock. 
GuidanceStylist GuidanceStylist is used within a GuidedStepFragment to display contextual information for the decision(s) required at that step. 
GuidanceStylist.Guidance A data class representing contextual information for a GuidedStepFragment. 
GuidedAction A data class which represents an action within a GuidedStepFragment. 
GuidedAction.Builder Builds a GuidedAction object. 
GuidedAction.BuilderBase<B extends BuilderBase> Base builder class to build a GuidedAction object. 
GuidedActionAutofillSupport Interface for a custom EditText subclass to support autofill in GuidedStepSupportFragment. 
GuidedActionAutofillSupport.OnAutofillListener Listener for autofill event. 
GuidedActionDiffCallback DiffCallback used for GuidedActions, see GuidedStepSupportFragment.setActionsDiffCallback(DiffCallback). 
GuidedActionEditText A custom EditText that satisfies the IME key monitoring requirements of GuidedStepFragment. 
GuidedActionsStylist GuidedActionsStylist is used within a GuidedStepFragment to supply the right-side panel where users can take actions. 
GuidedActionsStylist.ViewHolder ViewHolder caches information about the action item layouts' subviews. 
GuidedDatePickerAction Subclass of GuidedAction that can choose a date. 
GuidedDatePickerAction.Builder Builder class to build a GuidedDatePickerAction. 
GuidedDatePickerAction.BuilderBase<B extends BuilderBase> Base Builder class to build GuidedDatePickerAction. 
GuidedStepFragment This class is deprecated. use GuidedStepSupportFragment  
GuidedStepSupportFragment A GuidedStepSupportFragment is used to guide the user through a decision or series of decisions. 

H

HalfFloat

Denotes that the annotated element represents a half-precision floating point value. 

HandlerCompat Helper for accessing features in Handler. 
HeaderItem A header item describes the metadata of a Row, such as a category of media items. 
HeadersFragment This class is deprecated. use HeadersSupportFragment  
HeadersFragment.OnHeaderClickedListener This interface is deprecated. use HeadersSupportFragment  
HeadersFragment.OnHeaderViewSelectedListener This interface is deprecated. use HeadersSupportFragment  
HeadersSupportFragment An fragment containing a list of row headers. 
HeadersSupportFragment.OnHeaderClickedListener Interface definition for a callback to be invoked when a header item is clicked. 
HeadersSupportFragment.OnHeaderViewSelectedListener Interface definition for a callback to be invoked when a header item is selected. 
HeartRating A class for rating with a single degree of rating, "heart" vs "no heart". 
HeifWriter This class writes one or more still images (of the same dimensions) into a heif file. 
HeifWriter.Builder Builder class for constructing a HeifWriter object from specified parameters. 
HorizontalGridView A ViewGroup that shows items in a horizontal scrolling list. 
HorizontalHoverCardSwitcher A helper class for showing a hover card view below a HorizontalGridView. 
HtmlCompat Backwards compatible version of Html. 

I

IconCompat Helper for accessing features in Icon. 
ICUCompat  
IdRes Denotes that an integer parameter, field or method return value is expected to be an id resource reference (e.g. 
Ignore Ignores the marked element from Room's processing logic. 
ImageCardView A subclass of BaseCardView with an ImageView as its main region. 
ImageReference Reference to an image. 
ImageReference.Builder Builder for creating an ImageReference. 
ImageViewCompat Helper for accessing features in ImageView. 
ImeKeyMonitor Interface for an EditText subclass that can delegate calls to onKeyPreIme up to a registered listener. 
ImeKeyMonitor.ImeKeyListener Listener interface for key events intercepted pre-IME by edit text objects. 
Index Declares an index on an Entity. 
InputConnectionCompat Helper for accessing features in InputConnection introduced after API level 13 in a backwards compatible fashion. 
InputConnectionCompat.OnCommitContentListener Listener for commitContent method call, in a backwards compatible fashion. 
InputContentInfoCompat Helper for accessing features in InputContentInfo introduced after API level 13 in a backwards compatible fashion. 
InputDeviceCompat Helper class for accessing values in InputDevice. 
InputMerger An abstract class that allows the user to define how to merge a list of inputs to a ListenableWorker. 
Insert Marks a method in a Dao annotated class as an insert method. 
InspectableProperty Denotes that the annotated method is the getter for a resources-backed property that should be shown in Android Studio's inspection tools. 
InspectableProperty.EnumEntry One entry in an enumeration packed into a primitive {int}. 
InspectableProperty.FlagEntry One flag value of many that may be packed into a primitive {int}. 
InspectableProperty.ValueType The type of value packed into a primitive {int}. 
InstantTaskExecutorRule A JUnit Test Rule that swaps the background executor used by the Architecture Components with a different one which executes each task synchronously. 
IntDef Denotes that the annotated element of integer type, represents a logical type and that its value should be one of the explicitly named constants. 
IntegerRes Denotes that an integer parameter, field or method return value is expected to be an integer resource reference (e.g. 
IntentCompat Helper for accessing features in Intent. 
InterpolatorRes Denotes that an integer parameter, field or method return value is expected to be an interpolator resource reference (e.g. 
IntRange Denotes that the annotated element should be an int or long in the given range

Example: 


  @IntRange(from=0,to=255)
  public int getAlpha() {
      ... 
InvalidationTracker InvalidationTracker keeps a list of tables modified by queries and notifies its callbacks about these tables. 
InvalidationTracker.Observer An observer that can listen for changes in the database. 
ItemAlignmentFacet Optional facet provided by RecyclerView.Adapter or RecyclerView.ViewHolder for use in HorizontalGridView and VerticalGridView. 
ItemAlignmentFacet.ItemAlignmentDef Definition of an alignment position under a view. 
ItemBridgeAdapter Bridge from Presenter to RecyclerView.Adapter. 
ItemBridgeAdapter.AdapterListener Interface for listening to ViewHolder operations. 
ItemBridgeAdapter.ViewHolder ViewHolder for the ItemBridgeAdapter. 
ItemBridgeAdapter.Wrapper Interface for wrapping a view created by a Presenter into another view. 
ItemBridgeAdapterShadowOverlayWrapper A wrapper class working with ItemBridgeAdapter to wrap item view in a ShadowOverlayContainer. 
ItemDetailsLookup<K> The Selection library calls getItemDetails(MotionEvent) when it needs access to information about the area and/or ItemDetailsLookup.ItemDetails under a MotionEvent. 
ItemDetailsLookup.ItemDetails<K> An ItemDetails implementation provides the selection library with access to information about a specific RecyclerView item. 
ItemKeyedDataSource<Key, Value> Incremental data loader for paging keyed content, where loaded content uses previously loaded items as input to future loads. 
ItemKeyedDataSource.LoadCallback<Value> Callback for ItemKeyedDataSource ItemKeyedDataSource.loadBefore(LoadParams, LoadCallback) and ItemKeyedDataSource.loadAfter(LoadParams, LoadCallback) to return data. 
ItemKeyedDataSource.LoadInitialCallback<Value> Callback for ItemKeyedDataSource.loadInitial(LoadInitialParams, LoadInitialCallback) to return data and, optionally, position/count information. 
ItemKeyedDataSource.LoadInitialParams<Key> Holder object for inputs to ItemKeyedDataSource.loadInitial(LoadInitialParams, LoadInitialCallback). 
ItemKeyedDataSource.LoadParams<Key> Holder object for inputs to ItemKeyedDataSource.loadBefore(LoadParams, LoadCallback) and ItemKeyedDataSource.loadAfter(LoadParams, LoadCallback). 
ItemKeyProvider<K> Provides selection library access to stable selection keys identifying items presented by a RecyclerView instance. 
ItemKeyProvider.Scope  
ItemTouchHelper This is a utility class to add swipe to dismiss and drag & drop support to RecyclerView. 
ItemTouchHelper.Callback This class is the contract between ItemTouchHelper and your application. 
ItemTouchHelper.SimpleCallback A simple wrapper to the default Callback which you can construct with drag and swipe directions and this class will handle the flag callbacks. 
ItemTouchHelper.ViewDropHandler An interface which can be implemented by LayoutManager for better integration with ItemTouchHelper. 
ItemTouchUIUtil Utility class for ItemTouchHelper which handles item transformations for different API versions. 

J

JobIntentService Helper for processing work that has been enqueued for a job/service. 

K

Keep Denotes that the annotated element should not be removed when the code is minified at build time. 
KeyedAppState A keyed app state to be sent to an EMM (enterprise mobility management), with the intention that it is displayed to the management organization. 
KeyedAppState.KeyedAppStateBuilder The builder for KeyedAppState. 
KeyedAppStatesReporter A reporter of keyed app states to enable communication between an app and an EMM (enterprise mobility management). 
KeyedAppStatesService Base service for receiving app states in Device Owner and Profile Owner apps. 

L

Lane Configuration of a single lane of a road at a particular point in the navigation. 
Lane.Builder Builder for creating a Lane  
LaneDirection One of the possible directions a driver can go when using a particular lane at a particular step in the navigation. 
LaneDirection.Builder Builder for creating a LaneDirection  
LaneDirection.Shape Turn amount and direction. 
LatLng A representation of a latitude, longitude that can be serialized as a VersionedParcelable. 
LayoutInflaterCompat Helper for accessing features in LayoutInflater. 
LayoutInflaterFactory This interface is deprecated. Use LayoutInflater.Factory2 directly.  
LayoutRes Denotes that an integer parameter, field or method return value is expected to be a layout resource reference (e.g. 
LeanbackEditTextPreferenceDialogFragmentCompat Implemented a dialog to input text. 
LeanbackListPreferenceDialogFragment This class is deprecated. Use LeanbackListPreferenceDialogFragmentCompat  
LeanbackListPreferenceDialogFragment.AdapterMulti This class is deprecated. Ue LeanbackListPreferenceDialogFragmentCompat.  
LeanbackListPreferenceDialogFragment.AdapterSingle This class is deprecated. Use LeanbackListPreferenceDialogFragmentCompat.  
LeanbackListPreferenceDialogFragment.ViewHolder This class is deprecated. Ue LeanbackListPreferenceDialogFragmentCompat.  
LeanbackListPreferenceDialogFragment.ViewHolder.OnItemClickListener  
LeanbackListPreferenceDialogFragmentCompat Implemented a dialog to show ListPreference or MultiSelectListPreference. 
LeanbackListPreferenceDialogFragmentCompat.ViewHolder ViewHolder for each Item in the List. 
LeanbackPreferenceDialogFragment This class is deprecated. Use LeanbackPreferenceDialogFragmentCompat  
LeanbackPreferenceDialogFragmentCompat A fragment that shows DialogPreference, for example ListPreference or MultiSelectListPreference. 
LeanbackPreferenceFragment This class is deprecated. Use LeanbackPreferenceFragmentCompat  
LeanbackPreferenceFragmentCompat This fragment provides a fully decorated leanback-style preference fragment, including a list background and header. 
LeanbackSettingsFragment This class is deprecated. Use LeanbackSettingsFragmentCompat  
LeanbackSettingsFragmentCompat This fragment provides a container for displaying a LeanbackPreferenceFragmentCompat

The following sample code shows a simple leanback preference fragment that is populated from a resource. 

Lifecycle Defines an object that has an Android Lifecycle. 
Lifecycle.Event  
Lifecycle.State Lifecycle states. 
LifecycleEventObserver Class that can receive any lifecycle change and dispatch it to the receiver. 
LifecycleObserver Marks a class as a LifecycleObserver. 
LifecycleOwner A class that has an Android lifecycle. 
LifecycleRegistry An implementation of Lifecycle that can handle multiple observers. 
LifecycleRegistryOwner This interface is deprecated. Use android.support.v7.app.AppCompatActivity which extends LifecycleOwner, so there are no use cases for this class.  
LifecycleService A Service that is also a LifecycleOwner. 
LinearLayoutCompat A Layout that arranges its children in a single column or a single row. 
LinearLayoutCompat.LayoutParams Per-child layout information associated with ViewLinearLayout. 
LinearLayoutManager A RecyclerView.LayoutManager implementation which provides similar functionality to ListView. 
LinearLayoutManager.LayoutChunkResult  
LinearOutSlowInInterpolator Interpolator corresponding to R.interpolator.linear_out_slow_in. 
LinearSmoothScroller RecyclerView.SmoothScroller implementation which uses a LinearInterpolator until the target position becomes a child of the RecyclerView and then uses a DecelerateInterpolator to slowly approach to target position. 
LinearSnapHelper Implementation of the SnapHelper supporting snapping in either vertical or horizontal orientation. 
LinkifyCompat LinkifyCompat brings in Linkify improvements for URLs and email addresses to older API levels. 
ListAdapter<T, VH extends RecyclerView.ViewHolder> RecyclerView.Adapter base class for presenting List data in a RecyclerView, including computing diffs between Lists on a background thread. 
ListBuilder Builder for constructing slices composed of rows of content. 
ListBuilder.HeaderBuilder Builder to construct a header row. 
ListBuilder.InputRangeBuilder Builder to construct a input range row. 
ListBuilder.RangeBuilder Builder to construct a range row which can be added to a ListBuilder. 
ListBuilder.RowBuilder Builder to construct a row. 
ListenableWorker A class that can perform work asynchronously in WorkManager. 
ListenableWorker.Result The result of a ListenableWorker's computation. 
ListFragment Static library support version of the framework's ListFragment. 
ListItem<VH extends ListItem.ViewHolder> Definition of items that can be inserted into ListItemAdapter. 
ListItem.ViewBinder<VH> Functional interface to provide a way to interact with views in ViewHolder. 
ListItem.ViewHolder ViewHolder that supports ListItem.ViewBinder. 
ListItemAdapter Adapter for PagedListView to display ListItem. 
ListItemAdapter.BackgroundStyle Constant class for background style of items. 
ListItemProvider<VH extends ListItem.ViewHolder> Supplies data as ListItem. 
ListItemProvider.ListProvider<VH extends ListItem.ViewHolder> A simple provider that wraps around a list. 
ListPopupWindow Static library support version of the framework's ListPopupWindow. 
ListPopupWindowCompat Helper for accessing features in ListPopupWindow. 
ListPreference A Preference that displays a list of entries as a dialog. 
ListPreference.SimpleSummaryProvider A simple Preference.SummaryProvider implementation for a ListPreference. 
ListPreferenceDialogFragment This class is deprecated. Use ListPreferenceDialogFragmentCompat instead  
ListPreferenceDialogFragmentCompat  
ListRow A Row composed of a optional HeaderItem, and an ObjectAdapter describing the items in the list. 
ListRowHoverCardView ListRowHoverCardView contains a title and description. 
ListRowPresenter ListRowPresenter renders ListRow using a HorizontalGridView hosted in a ListRowView. 
ListRowPresenter.SelectItemViewHolderTask A task on the ListRowPresenter.ViewHolder that can select an item by position in the HorizontalGridView and perform an optional item task on it. 
ListRowPresenter.ViewHolder ViewHolder for the ListRowPresenter. 
ListRowView ListRowView is a ViewGroup which always contains a HorizontalGridView, and may optionally include a hover card. 
ListUpdateCallback An interface that can receive Update operations that are applied to a list. 
ListViewAutoScrollHelper An implementation of AutoScrollHelper that knows how to scroll through a ListView. 
ListViewCompat Helper for accessing features in ListView  
LiveData<T> LiveData is a data holder class that can be observed within a given lifecycle. 
LiveDataReactiveStreams Adapts LiveData input and output to the ReactiveStreams spec. 
LivePagedListBuilder<Key, Value> Builder for LiveData<PagedList>, given a DataSource.Factory and a PagedList.Config. 
Loader<D> Static library support version of the framework's Loader. 
Loader.ForceLoadContentObserver An implementation of a ContentObserver that takes care of connecting it to the Loader to have the loader re-load its data when the observer is told it has changed. 
Loader.OnLoadCanceledListener<D> Interface that is implemented to discover when a Loader has been canceled before it finished loading its data. 
Loader.OnLoadCompleteListener<D> Interface that is implemented to discover when a Loader has finished loading its data. 
LoaderManager Static library support version of the framework's LoaderManager. 
LoaderManager.LoaderCallbacks<D> Callback interface for a client to interact with the manager. 
LoaderQueryRunner A ContentPager.QueryRunner that executes queries using a LoaderManager. 
LocalBroadcastManager This class is deprecated. LocalBroadcastManager is an application-wide event bus and embraces layer violations in your app: any component may listen events from any other. You can replace usage of LocalBroadcastManager with other implementation of observable pattern, depending on your usecase suitable options may be LiveData or reactive streams.  
LocaleListCompat Helper for accessing features in LocaleList. 
LocationManagerCompat Helper for accessing features in LocationManager. 
LongDef Denotes that the annotated long element represents a logical type and that its value should be one of the explicitly named constants. 
LongSparseArray<E> SparseArray mapping longs to Objects. 
LruCache<K, V> Static library version of android.util.LruCache. 

M

MainThread Denotes that the annotated method should only be called on the main thread. 
Maneuver Information about a maneuver that the driver will be required to perform. 
Maneuver.Builder Builder for creating a Maneuver  
Maneuver.Type Possible maneuver types. 
MarginLayoutParamsCompat Helper for accessing API features in MarginLayoutParams in a backwards compatible way. 
MathUtils A utility class providing functions useful for common mathematical operations. 
MbmsHelper Helper methods for working with the android.telephony.mbms cell-broadcast APIs. 
MediaBrowser Browses media content offered by a MediaLibraryService. 
MediaBrowser.BrowserCallback Callback to listen events from MediaLibraryService. 
MediaBrowser.BrowserResult Result class to be used with ListenableFuture for asynchronous calls. 
MediaBrowserCompat Browses media content offered by a MediaBrowserServiceCompat. 
MediaBrowserCompat.ConnectionCallback Callbacks for connection related events. 
MediaBrowserCompat.CustomActionCallback Callback for receiving the result of MediaBrowserCompat.sendCustomAction(String, Bundle, MediaBrowserCompat.CustomActionCallback). 
MediaBrowserCompat.ItemCallback Callback for receiving the result of MediaBrowserCompat.getItem(String, MediaBrowserCompat.ItemCallback). 
MediaBrowserCompat.MediaItem A class with information on a single media item for use in browsing/searching media. 
MediaBrowserCompat.SearchCallback Callback for receiving the result of MediaBrowserCompat.search(String, Bundle, MediaBrowserCompat.SearchCallback). 
MediaBrowserCompat.SubscriptionCallback Callbacks for subscription related events. 
MediaBrowserServiceCompat Base class for media browse services. 
MediaBrowserServiceCompat.BrowserRoot Contains information that the browser service needs to send to the client when first connected. 
MediaBrowserServiceCompat.Result<T> Completion handler for asynchronous callback methods in MediaBrowserServiceCompat. 
MediaButtonReceiver A media button receiver receives and helps translate hardware media playback buttons, such as those found on wired and wireless headsets, into the appropriate callbacks in your app. 
MediaControlIntent Constants for media control intents. 
MediaController Allows an app to interact with an active MediaSession or a MediaSessionService which would provide MediaSession. 
MediaController.ControllerCallback Interface for listening to change in activeness of the MediaSession. 
MediaController.ControllerResult Result class to be used with ListenableFuture for asynchronous calls. 
MediaController.PlaybackInfo Holds information about the the way volume is handled for this session. 
MediaControllerAdapter A helper class for implementing a adapter layer for MediaControllerCompat. 
MediaControllerCompat Allows an app to interact with an ongoing media session. 
MediaControllerCompat.Callback Callback for receiving updates on from the session. 
MediaControllerCompat.PlaybackInfo Holds information about the way volume is handled for this session. 
MediaControllerCompat.TransportControls Interface for controlling media playback on a session. 
MediaControllerGlue This class is deprecated. Use MediaControllerAdapter with PlaybackTransportControlGlue or PlaybackBannerControlGlue.  
MediaDescriptionCompat A simple set of metadata for a media item suitable for display. 
MediaDescriptionCompat.Builder Builder for MediaDescriptionCompat objects. 
MediaItem A class with information on a single media item with the metadata information. 
MediaItem.Builder Builder for MediaItem. 
MediaItemMetadata Constants for specifying metadata about a media item as a Bundle. 
MediaItemStatus Describes the playback status of a media item. 
MediaItemStatus.Builder Builder for media item status objects. 
MediaLibraryService Base class for media library services, which is the service containing MediaLibraryService.MediaLibrarySession. 
MediaLibraryService.LibraryParams Contains information that the library service needs to send to the client. 
MediaLibraryService.LibraryParams.Builder Builds MediaLibraryService.LibraryParams. 
MediaLibraryService.LibraryResult Result class to be used with ListenableFuture for asynchronous calls. 
MediaLibraryService.MediaLibrarySession Session for the MediaLibraryService. 
MediaLibraryService.MediaLibrarySession.Builder Builder for MediaLibraryService.MediaLibrarySession. 
MediaLibraryService.MediaLibrarySession.MediaLibrarySessionCallback Callback for the MediaLibraryService.MediaLibrarySession. 
MediaMetadata Contains metadata about an item, such as the title, artist, etc. 
MediaMetadata.Builder Use to build MediaMetadatax objects. 
MediaMetadataCompat Contains metadata about an item, such as the title, artist, etc. 
MediaMetadataCompat.Builder Use to build MediaMetadata objects. 
MediaPlayer A media player which plays MediaItems. 
MediaPlayer.PlayerCallback Interface definition for callbacks to be invoked when the player has the corresponding events. 
MediaPlayer.TrackInfo Class for the player to return each audio/video/subtitle track's metadata. 
MediaPlayerAdapter This implementation extends the PlayerAdapter with a MediaPlayer. 
MediaRouteActionProvider The media route action provider displays a media route button in the application's ActionBar to allow the user to select routes and to control the currently selected route. 
MediaRouteButton The media route button allows the user to select routes and to control the currently selected route. 
MediaRouteChooserDialog This class implements the route chooser dialog for MediaRouter. 
MediaRouteChooserDialogFragment Media route chooser dialog fragment. 
MediaRouteControllerDialog This class implements the route controller dialog for MediaRouter. 
MediaRouteControllerDialogFragment Media route controller dialog fragment. 
MediaRouteDescriptor Describes the properties of a route. 
MediaRouteDescriptor.Builder Builder for media route descriptors. 
MediaRouteDialogFactory The media route dialog factory is responsible for creating the media route chooser and controller dialogs as needed. 
MediaRouteDiscoveryFragment Media route discovery fragment. 
MediaRouteDiscoveryRequest Describes the kinds of routes that the media router would like to discover and whether to perform active scanning. 
MediaRouteProvider Media route providers are used to publish additional media routes for use within an application. 
MediaRouteProvider.Callback Callback which is invoked when route information becomes available or changes. 
MediaRouteProvider.DynamicGroupRouteController Provides control over a dynamic group route. 
MediaRouteProvider.DynamicGroupRouteController.DynamicRouteDescriptor Contains a route, its selection state and its capabilities. 
MediaRouteProvider.DynamicGroupRouteController.DynamicRouteDescriptor.Builder Builder for MediaRouteProvider.DynamicGroupRouteController.DynamicRouteDescriptor  
MediaRouteProvider.DynamicGroupRouteController.OnDynamicRoutesChangedListener Used to notify media router each route's property changes regarding this MediaRouteProvider.DynamicGroupRouteController instance. 
MediaRouteProvider.ProviderMetadata Describes properties of the route provider's implementation. 
MediaRouteProvider.RouteController Provides control over a particular route. 
MediaRouteProviderDescriptor Describes the state of a media route provider and the routes that it publishes. 
MediaRouteProviderDescriptor.Builder Builder for MediaRouteProviderDescriptor. 
MediaRouteProviderService Base class for media route provider services. 
MediaRouter MediaRouter allows applications to control the routing of media channels and streams from the current device to external speakers and destination devices. 
MediaRouter.Callback Interface for receiving events about media routing changes. 
MediaRouter.ControlRequestCallback Callback which is invoked with the result of a media control request. 
MediaRouter.ProviderInfo Provides information about a media route provider. 
MediaRouter.RouteInfo Provides information about a media route. 
MediaRouteSelector Describes the capabilities of routes that applications would like to discover and use. 
MediaRouteSelector.Builder Builder for media route selectors. 
MediaSession Allows a media app to expose its transport controls and playback information in a process to other processes including the Android framework and other apps. 
MediaSession.Builder Builder for MediaSession. 
MediaSession.CommandButton Button for a SessionCommand that will be shown by the controller. 
MediaSession.CommandButton.Builder Builder for MediaSession.CommandButton. 
MediaSession.ControllerInfo Information of a controller. 
MediaSession.SessionCallback Callback to be called for all incoming commands from MediaControllers. 
MediaSession.SessionResult Result class to be used with ListenableFuture for asynchronous calls. 
MediaSessionCompat Allows interaction with media controllers, volume keys, media buttons, and transport controls. 
MediaSessionCompat.Callback Receives transport controls, media buttons, and commands from controllers and the system. 
MediaSessionCompat.OnActiveChangeListener  
MediaSessionCompat.QueueItem A single item that is part of the play queue. 
MediaSessionCompat.Token Represents an ongoing session. 
MediaSessionManager Provides support for interacting with media sessions that applications have published to express their ongoing media playback state. 
MediaSessionManager Provides support for interacting with media sessions that applications have published in order to express their ongoing media playback state. 
MediaSessionManager.RemoteUserInfo Information of a remote user of MediaSessionCompat or MediaBrowserServiceCompat. 
MediaSessionService Base class for media session services, which is the service containing MediaSession. 
MediaSessionService.MediaNotification Returned by MediaSessionService.onUpdateNotification(MediaSession) for making session service foreground service to keep playback running in the background. 
MediaSessionStatus Describes the playback status of a media session. 
MediaSessionStatus.Builder Builder for media session status objects. 
MediaTimestamp An immutable object that represents the linear correlation between the media time and the system time. 
MediatorLiveData<T> LiveData subclass which may observe other LiveData objects and react on OnChanged events from them. 
MenuCompat Helper for accessing features in Menu. 
MenuItemCompat Helper for accessing features in MenuItem. 
MenuItemCompat.OnActionExpandListener This interface is deprecated. Use MenuItem.OnActionExpandListener directly.  
MenuRes Denotes that an integer parameter, field or method return value is expected to be a menu resource reference. 
MessageCompat Helper for accessing features in Message. 
MetadataConstants Constants for android wear apps which are related to manifest meta-data. 
MetadataRepo Class to hold the emoji metadata required to process and draw emojis. 
Migration Base class for a database migration. 
MigrationTestHelper A class that can be used in your Instrumentation tests that can create the database in an older schema. 
MimeTypeFilter Provides utility methods for matching MIME type filters used in ContentProvider. 
MotionEventCompat Helper for accessing features in MotionEvent. 
MultiActionsProvider An interface implemented by the user if they wish to provide actions for a media item row to be displayed by an AbstractMediaItemPresenter. 
MultiActionsProvider.MultiAction MultiAction represents an action that can have multiple states. 
MultiSelectListPreference A Preference that displays a list of entries as a dialog. 
MultiSelectListPreferenceDialogFragment This class is deprecated. Use MultiSelectListPreferenceDialogFragmentCompat instead  
MultiSelectListPreferenceDialogFragmentCompat  
MutableLiveData<T> LiveData which publicly exposes setValue(T) and postValue(T) method. 
MutableSelection<K> Subclass of Selection exposing public support for mutating the underlying selection data. 

N

NavAction Navigation actions provide a level of indirection between your navigation code and the underlying destinations. 
NavArgs An interface marking generated Args classes. 
NavArgument NavArgument denotes an argument that is supported by a NavDestination. 
NavArgument.Builder A builder for constructing NavArgument instances. 
NavController NavController manages app navigation within a NavHost. 
NavController.OnDestinationChangedListener OnDestinationChangedListener receives a callback when the NavController.getCurrentDestination() or its arguments change. 
NavDeepLinkBuilder Class used to construct deep links to a particular destination in a NavGraph. 
NavDestination NavDestination represents one node within an overall navigation graph. 
NavDestination.ClassType This optional annotation allows tooling to offer auto-complete for the android:name attribute. 
NavDirections An interface that describes a navigation operation: action's id and arguments  
NavGraph NavGraph is a collection of NavDestination nodes fetchable by ID. 
NavGraphNavigator A Navigator built specifically for NavGraph elements. 
NavHost A host is a single context or container for navigation via a NavController. 
NavHostFragment NavHostFragment provides an area within your layout for self-contained navigation to occur. 
Navigation Entry point for navigation operations. 
NavigationRes Denotes that an integer parameter, field or method return value is expected to be a navigation resource reference (e.g. 
NavigationState Navigation state data to be displayed on the instrument cluster of a car. 
NavigationState.Builder Builder for creating a NavigationState  
NavigationState.ServiceStatus Possible service states  
NavigationUI Class which hooks up elements typically in the 'chrome' of your application such as global navigation patterns like a navigation drawer or bottom nav bar with your NavController. 
Navigator<D extends NavDestination> Navigator defines a mechanism for navigating within an app. 
Navigator.Extras Interface indicating that this class should be passed to its respective Navigator to enable Navigator specific behavior. 
Navigator.Name This annotation should be added to each Navigator subclass to denote the default name used to register the Navigator with a NavigatorProvider. 
NavigatorProvider A NavigationProvider stores a set of Navigators that are valid ways to navigate to a destination. 
NavInflater Class which translates a navigation XML file into a NavGraph  
NavOptions NavOptions stores special options for navigate actions  
NavOptions.Builder Builder for constructing new instances of NavOptions. 
NavType<T> NavType denotes the type that can be used in a NavArgument. 
NavType.EnumType<D extends Enum> EnumType is used for NavArguments holding enum values. 
NavType.ParcelableArrayType<D extends Parcelable> ParcelableArrayType is used for NavArguments which hold arrays of Parcelables. 
NavType.ParcelableType<D> ParcelableType is used for passing Parcelables in NavArguments. 
NavType.SerializableArrayType<D extends Serializable> SerializableArrayType is used for NavArguments that hold arrays of Serializables. 
NavType.SerializableType<D extends Serializable> SerializableType is used for Serializable NavArguments. 
NavUtils NavUtils provides helper functionality for applications implementing recommended Android UI navigation patterns. 
NestedScrollingChild This interface should be implemented by View subclasses that wish to support dispatching nested scrolling operations to a cooperating parent ViewGroup. 
NestedScrollingChild2 This interface should be implemented by View subclasses that wish to support dispatching nested scrolling operations to a cooperating parent ViewGroup. 
NestedScrollingChild3 This interface should be implemented by View subclasses that wish to support dispatching nested scrolling operations to a cooperating parent ViewGroup. 
NestedScrollingChildHelper Helper class for implementing nested scrolling child views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21). 
NestedScrollingParent This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view. 
NestedScrollingParent2 This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view. 
NestedScrollingParent3 This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view. 
NestedScrollingParentHelper Helper class for implementing nested scrolling parent views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21). 
NestedScrollView NestedScrollView is just like ScrollView, but it supports acting as both a nested scrolling parent and child on both new and old versions of Android. 
NestedScrollView.OnScrollChangeListener Interface definition for a callback to be invoked when the scroll X or Y positions of a view change. 
NetworkType An enumeration of various network types that can be used as Constraints for work. 
NonNull Denotes that a parameter, field or method return value can never be null. 
NotificationCompat Helper for accessing features in Notification. 
NotificationCompat Class containing media specfic styles that you can use with NotificationCompat.Builder.setStyle(NotificationCompat.Style). 
NotificationCompat.Action Structure to encapsulate a named action that can be shown as part of this notification. 
NotificationCompat.Action.Builder Builder class for NotificationCompat.Action objects. 
NotificationCompat.Action.Extender Extender interface for use with NotificationCompat.Builder.extend(NotificationCompat.Extender). 
NotificationCompat.Action.SemanticAction Provides meaning to an NotificationCompat.Action that hints at what the associated PendingIntent will do. 
NotificationCompat.Action.WearableExtender Wearable extender for notification actions. 
NotificationCompat.BigPictureStyle Helper class for generating large-format notifications that include a large image attachment. 
NotificationCompat.BigTextStyle Helper class for generating large-format notifications that include a lot of text. 
NotificationCompat.Builder Builder class for NotificationCompat objects. 
NotificationCompat.CarExtender

Helper class to add Android Auto extensions to notifications. 

NotificationCompat.CarExtender.UnreadConversation A class which holds the unread messages from a conversation. 
NotificationCompat.CarExtender.UnreadConversation.Builder Builder class for NotificationCompat.CarExtender.UnreadConversation objects. 
NotificationCompat.DecoratedCustomViewStyle Notification style for custom views that are decorated by the system. 
NotificationCompat.DecoratedMediaCustomViewStyle Notification style for media custom views that are decorated by the system. 
NotificationCompat.Extender Extender interface for use with NotificationCompat.Builder.extend(NotificationCompat.Extender). 
NotificationCompat.InboxStyle Helper class for generating large-format notifications that include a list of (up to 5) strings. 
NotificationCompat.MediaStyle Notification style for media playback notifications. 
NotificationCompat.MessagingStyle Helper class for generating large-format notifications that include multiple back-and-forth messages of varying types between any number of people. 
NotificationCompat.MessagingStyle.Message  
NotificationCompat.Style An object that can apply a rich notification style to a Notification.CarExtender.Builder object. 
NotificationCompat.WearableExtender Helper class to add wearable extensions to notifications. 
NotificationCompatExtras Well-known extras used by NotificationCompat for backwards compatibility. 
NotificationCompatSideChannelService Abstract service to receive side channel notifications sent from NotificationManagerCompat. 
NotificationManagerCompat Compatibility library for NotificationManager with fallbacks for older platforms. 
Nullable Denotes that a parameter, field or method return value can be null. 

O

ObjectAdapter Base class adapter to be used in leanback activities. 
ObjectAdapter.DataObserver A DataObserver can be notified when an ObjectAdapter's underlying data changes. 
ObjectsCompat This class consists of static utility methods for operating on objects. 
Observer<T> A simple callback that can receive from LiveData. 
OnActionClickedListener Interface for receiving notification when an Action is clicked. 
OnApplyWindowInsetsListener Listener for applying window insets on a view in a custom way. 
OnBackPressedCallback Interface for handling OnBackPressedDispatcher.onBackPressed() callbacks without strongly coupling that implementation to a subclass of ComponentActivity. 
OnBackPressedDispatcher Dispatcher that can be used to register OnBackPressedCallback instances for handling the ComponentActivity.onBackPressed() callback via composition. 
OnboardingFragment This class is deprecated. use OnboardingSupportFragment  
OnboardingSupportFragment An OnboardingSupportFragment provides a common and simple way to build onboarding screen for applications. 
OnChildLaidOutListener Interface for receiving notification when a child of this ViewGroup has been laid out. 
OnChildSelectedListener This interface is deprecated. Use OnChildViewHolderSelectedListener  
OnChildViewHolderSelectedListener Interface for receiving notification when a child of this ViewGroup has been selected. 
OnConflictStrategy Set of conflict handling strategies for various Dao methods. 
OnContextClickListener Register an OnContextClickListener to be notified when a context click occurs. 
OnDragInitiatedListener Register an OnDragInitiatedListener to be notified when user intent to perform drag and drop operations on an item or items has been detected. 
OneShotPreDrawListener An OnPreDrawListener that will remove itself after one OnPreDraw call. 
OneTimeWorkRequest A WorkRequest for non-repeating work. 
OneTimeWorkRequest.Builder Builder for OneTimeWorkRequests. 
OnItemActivatedListener<K> Register an OnItemActivatedListener to be notified when an item is activated (tapped or double clicked). 
OnItemViewClickedListener Interface for receiving notification when a item view holder is clicked. 
OnItemViewSelectedListener Interface for receiving notification when a row or item becomes selected. 
OnLifecycleEvent  
OnUxRestrictionsChangedListener Listener Interface for clients to implement to get updated on User Experience Restrictions (UXR, or UX restrictions) related changes. 
Operation An object that provides information about the execution of an asynchronous command being performed by WorkManager. 
Operation.State The lifecycle state of an Operation. 
Operation.State.FAILURE This represents an Operation which has failed. 
Operation.State.IN_PROGRESS This represents an Operation which is in progress. 
Operation.State.SUCCESS This represents an Operation which is successful. 
OperationCanceledException An exception type that is thrown when an operation in progress is canceled. 
OperationMonitor OperationMonitor provides a mechanism to coordinate application logic with ongoing user selection activities (such as active band selection and active gesture selection). 
OperationMonitor.OnChangeListener Listen to changes in operation status. 
OrientationHelper Helper class for LayoutManagers to abstract measurements depending on the View's orientation. 
OverwritingInputMerger An InputMerger that attempts to add all keys from all inputs to the output. 

P

PackageInfoCompat Helper for accessing features in PackageInfo. 
PagedList<T> Lazy loading list that pages in immutable content from a DataSource. 
PagedList.BoundaryCallback<T> Signals when a PagedList has reached the end of available data. 
PagedList.Builder<Key, Value> Builder class for PagedList. 
PagedList.Callback Callback signaling when content is loaded into the list. 
PagedList.Config Configures how a PagedList loads content from its DataSource. 
PagedList.Config.Builder Builder class for PagedList.Config. 
PagedListAdapter<T, VH extends RecyclerView.ViewHolder> RecyclerView.Adapter base class for presenting paged data from PagedLists in a RecyclerView. 
PagedListView View that wraps a RecyclerView and a scroll bar that has page up and down arrows. 
PagedListView.DividerVisibilityManager Interface for controlling visibility of item dividers for individual items based on the item's position. 
PagedListView.Gutter The possible values for @{link #setGutter}. 
PagedListView.ItemCap Interface for a RecyclerView.Adapter to cap the number of items. 
PagedListView.ItemPositionOffset Interface for a RecyclerView.Adapter to set the position offset for the adapter to load the data. 
PagedListView.OnScrollListener Used to listen for PagedListView scroll events. 
PagedScrollBarView A custom view to provide list scroll behaviour -- up/down buttons and scroll indicator. 
PagedScrollBarView.PaginationListener Listener for when the list should paginate. 
PageKeyedDataSource<Key, Value> Incremental data loader for page-keyed content, where requests return keys for next/previous pages. 
PageKeyedDataSource.LoadCallback<Key, Value> Callback for PageKeyedDataSource PageKeyedDataSource.loadBefore(LoadParams, LoadCallback) and PageKeyedDataSource.loadAfter(LoadParams, LoadCallback) to return data. 
PageKeyedDataSource.LoadInitialCallback<Key, Value> Callback for PageKeyedDataSource.loadInitial(LoadInitialParams, LoadInitialCallback) to return data and, optionally, position/count information. 
PageKeyedDataSource.LoadInitialParams<Key> Holder object for inputs to PageKeyedDataSource.loadInitial(LoadInitialParams, LoadInitialCallback). 
PageKeyedDataSource.LoadParams<Key> Holder object for inputs to PageKeyedDataSource.loadBefore(LoadParams, LoadCallback) and PageKeyedDataSource.loadAfter(LoadParams, LoadCallback). 
PagerAdapter Base class providing the adapter to populate pages inside of a ViewPager. 
PageRow Used to represent content spanning full page. 
PagerSnapHelper Implementation of the SnapHelper supporting pager style snapping in either vertical or horizontal orientation. 
PagerTabStrip PagerTabStrip is an interactive indicator of the current, next, and previous pages of a ViewPager. 
PagerTitleStrip PagerTitleStrip is a non-interactive indicator of the current, next, and previous pages of a ViewPager. 
PaintCompat Helper for accessing features in Paint. 
Pair<F, S> Container to ease passing around a tuple of two objects. 
Palette A helper class to extract prominent colors from an image. 
Palette.Builder Builder class for generating Palette instances. 
Palette.Filter A Filter provides a mechanism for exercising fine-grained control over which colors are valid within a resulting Palette. 
Palette.PaletteAsyncListener Listener to be used with Palette.generateAsync(Bitmap, PaletteAsyncListener) or Palette.generateAsync(Bitmap, int, PaletteAsyncListener)  
Palette.Swatch Represents a color swatch generated from an image's palette. 
Parallax<PropertyT extends Property> Parallax tracks a list of dynamic Propertys typically representing foreground UI element positions on screen. 
Parallax.FloatProperty FloatProperty provide access to an index based integer type property inside Parallax. 
Parallax.IntProperty IntProperty provide access to an index based integer type property inside Parallax. 
Parallax.PropertyMarkerValue<PropertyT> Class holding a fixed value for a Property in Parallax. 
ParallaxEffect ParallaxEffect class drives changes in ParallaxTarget in response to changes in variables defined in Parallax. 
ParallaxTarget ParallaxTarget is responsible for updating the target through the update(float) method or the directUpdate(Number) method when isDirectMapping() is true. 
ParallaxTarget.DirectPropertyTarget<T, V extends Number> DirectPropertyTarget is to support direct mapping into either Integer Property or Float Property. 
ParallaxTarget.PropertyValuesHolderTarget PropertyValuesHolderTarget is an implementation of ParallaxTarget that uses PropertyValuesHolder to update the target object. 
ParcelableCompat This class is deprecated. Use Parcelable.ClassLoaderCreator directly.  
ParcelableCompatCreatorCallbacks<T> This interface is deprecated. Use Parcelable.ClassLoaderCreator directly.  
ParcelableVolumeInfo Convenience class for passing information about the audio configuration of a MediaSessionCompat. 
ParcelCompat Helper for accessing features in Parcel. 
ParcelUtils Utilities for managing VersionedParcelables. 
PathInterpolatorCompat Helper for creating path-based Interpolator instances. 
PathMotion This base class can be extended to provide motion along a Path to Transitions. 
PathSegment A line segment that represents an approximate fraction of a Path after flattening. 
PathUtils A set of path-related utility methods. 
PatternPathMotion A PathMotion that takes a Path pattern and applies it to the separation between two points. 
PatternsCompat Commonly used regular expression patterns. 
PercentageRating A class for rating expressed as a percentage. 
PercentFrameLayout This class is deprecated. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap: 
 <androidx.constraintlayout.widget.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </androidx.constraintlayout.widget.ConstraintLayout>
 
PercentFrameLayout.LayoutParams This class is deprecated. this class is deprecated along with its parent class.  
PercentLayoutHelper This class is deprecated. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap: 
 <androidx.constraintlayout.widget.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </androidx.constraintlayout.widget.ConstraintLayout>
 
PercentLayoutHelper.PercentLayoutInfo This class is deprecated. use ConstraintLayout and Guidelines for layout support.  
PercentLayoutHelper.PercentLayoutParams This interface is deprecated. this class is deprecated along with its parent class.  
PercentRelativeLayout This class is deprecated. consider using ConstraintLayout and associated layouts instead. The following shows how to replicate the functionality of percentage layouts with a ConstraintLayout. The Guidelines are used to define each percentage break point, and then a Button view is stretched to fill the gap: 
 <androidx.constraintlayout.widget.ConstraintLayout
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto"
         android:layout_width="match_parent"
         android:layout_height="match_parent">

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/left_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/right_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="vertical"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/top_guideline"
         app:layout_constraintGuide_percent=".15"
         android:orientation="horizontal"/>

     <androidx.constraintlayout.widget.Guideline
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:id="@+id/bottom_guideline"
         app:layout_constraintGuide_percent=".85"
         android:orientation="horizontal"/>

     <Button
         android:text="Button"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:id="@+id/button"
         app:layout_constraintLeft_toLeftOf="@+id/left_guideline"
         app:layout_constraintRight_toRightOf="@+id/right_guideline"
         app:layout_constraintTop_toTopOf="@+id/top_guideline"
         app:layout_constraintBottom_toBottomOf="@+id/bottom_guideline" />

 </androidx.constraintlayout.widget.ConstraintLayout>
 
PercentRelativeLayout.LayoutParams This class is deprecated. this class is deprecated along with its parent class.  
PeriodicWorkRequest A WorkRequest for repeating work. 
PeriodicWorkRequest.Builder Builder for PeriodicWorkRequests. 
PermissionChecker This class provides permission check APIs that verify both the permission and the associated app op for this permission if such is defined. 
PermissionInfoCompat Helper for accessing features in PermissionInfo. 
Person Provides an immutable reference to an entity that appears repeatedly on different surfaces of the platform. 
Person.Builder Builder for the immutable Person class. 
Picker Picker is a widget showing multiple customized PickerColumns. 
Picker.PickerValueListener Listener for Picker value changes. 
PickerColumn Picker column class used by Picker, defines a contiguous value ranges and associated labels. 
PinPicker Picker subclass for allowing the user to enter a numerical PIN. 
PlaybackBannerControlGlue<T extends PlayerAdapter> A helper class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost. 
PlaybackBaseControlGlue<T extends PlayerAdapter> A base abstract class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost. 
PlaybackControlGlue A helper class for managing a PlaybackControlsRow and PlaybackGlueHost that implements a recommended approach to handling standard playback control actions such as play/pause, fast forward/rewind at progressive speed levels, and skip to next/previous. 
PlaybackControlsRow A Row of playback controls to be displayed by a PlaybackControlsRowPresenter. 
PlaybackControlsRow.ClosedCaptioningAction An action for displaying a CC (Closed Captioning) icon. 
PlaybackControlsRow.FastForwardAction An action displaying an icon for fast forward. 
PlaybackControlsRow.HighQualityAction An action for displaying a HQ (High Quality) icon. 
PlaybackControlsRow.MoreActions An action displaying an icon for "more actions". 
PlaybackControlsRow.MultiAction Base class for an action comprised of a series of icons. 
PlaybackControlsRow.OnPlaybackProgressCallback Listener for progress or duration change. 
PlaybackControlsRow.PictureInPictureAction An action displaying an icon for picture-in-picture. 
PlaybackControlsRow.PlayPauseAction An action displaying icons for play and pause. 
PlaybackControlsRow.RepeatAction An action for displaying three repeat states: none, one, or all. 
PlaybackControlsRow.RewindAction An action displaying an icon for rewind. 
PlaybackControlsRow.ShuffleAction An action for displaying a shuffle icon. 
PlaybackControlsRow.SkipNextAction An action displaying an icon for skip next. 
PlaybackControlsRow.SkipPreviousAction An action displaying an icon for skip previous. 
PlaybackControlsRow.ThumbsAction A base class for displaying a thumbs action. 
PlaybackControlsRow.ThumbsDownAction An action displaying an icon for thumbs down. 
PlaybackControlsRow.ThumbsUpAction An action displaying an icon for thumbs up. 
PlaybackControlsRowPresenter A PlaybackControlsRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons. 
PlaybackControlsRowPresenter.ViewHolder A ViewHolder for the PlaybackControlsRow. 
PlaybackFragment This class is deprecated. use PlaybackSupportFragment  
PlaybackFragmentGlueHost This class is deprecated. use PlaybackSupportFragmentGlueHost  
PlaybackGlue Base class for abstraction of media play/pause feature. 
PlaybackGlue.PlayerCallback Interface to allow clients to take action once the video is ready to play and start stop. 
PlaybackGlueHost This class represents the UI (e.g. 
PlaybackGlueHost.HostCallback Callbacks triggered by the host(e.g. 
PlaybackGlueHost.PlayerCallback Optional Client that implemented by PlaybackGlueHost to respond to player event. 
PlaybackParams Structure for common playback params. 
PlaybackParams.Builder The builder class that makes it easy to chain setters to create a PlaybackParams object. 
PlaybackRowPresenter Subclass of RowPresenter that can define the desired behavior when the view reappears. 
PlaybackRowPresenter.ViewHolder This container is used for trapping click events and passing them to the playback controls. 
PlaybackSeekDataProvider Class to be implemented by app to provide seeking data and thumbnails to UI. 
PlaybackSeekDataProvider.ResultCallback Client to receive result for PlaybackSeekDataProvider.getThumbnail(int, ResultCallback). 
PlaybackSeekUi Interface to be implemented by UI component to support seeking. 
PlaybackSeekUi.Client Client (e.g. 
PlaybackStateCompat Playback state for a MediaSessionCompat. 
PlaybackStateCompat.Builder Builder for PlaybackStateCompat objects. 
PlaybackStateCompat.CustomAction CustomActions can be used to extend the capabilities of the standard transport controls by exposing app specific actions to Controllers. 
PlaybackStateCompat.CustomAction.Builder Builder for PlaybackStateCompat.CustomAction objects. 
PlaybackSupportFragment A fragment for displaying playback controls and related content. 
PlaybackSupportFragmentGlueHost PlaybackGlueHost implementation the interaction between this class and PlaybackSupportFragment. 
PlaybackTransportControlGlue<T extends PlayerAdapter> A helper class for managing a PlaybackControlsRow being displayed in PlaybackGlueHost, it supports standard playback control actions play/pause, and skip next/previous. 
PlaybackTransportRowPresenter A PlaybackTransportRowPresenter renders a PlaybackControlsRow to display a series of playback control buttons. 
PlaybackTransportRowPresenter.ViewHolder A ViewHolder for the PlaybackControlsRow supporting seek UI. 
PlayerAdapter Base class that wraps underlying media player. 
PlayerAdapter.Callback Client for client of PlayerAdapter. 
PluralsRes Denotes that an integer parameter, field or method return value is expected to be a plurals resource reference. 
PointerIconCompat Helper for accessing features in PointerIcon in a backwards compatible fashion. 
Pools Helper class for creating pools of objects. 
Pools.Pool<T> Interface for managing a pool of objects. 
Pools.SimplePool<T> Simple (non-synchronized) pool of objects. 
Pools.SynchronizedPool<T> Synchronized) pool of objects. 
PopupMenu Static library support version of the framework's PopupMenu. 
PopupMenu.OnDismissListener Callback interface used to notify the application that the menu has closed. 
PopupMenu.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
PopupMenuCompat Helper for accessing features in PopupMenu. 
PopupWindowCompat Helper for accessing features in PopupWindow. 
PositionalDataSource<T> Position-based data loader for a fixed-size, countable data set, supporting fixed-size loads at arbitrary page positions. 
PositionalDataSource.LoadInitialCallback<T> Callback for PositionalDataSource.loadInitial(LoadInitialParams, LoadInitialCallback) to return data, position, and count. 
PositionalDataSource.LoadInitialParams Holder object for inputs to PositionalDataSource.loadInitial(LoadInitialParams, LoadInitialCallback). 
PositionalDataSource.LoadRangeCallback<T> Callback for PositionalDataSource PositionalDataSource.loadRange(LoadRangeParams, LoadRangeCallback) to return data. 
PositionalDataSource.LoadRangeParams Holder object for inputs to PositionalDataSource.loadRange(LoadRangeParams, LoadRangeCallback). 
PostMessageService A service to receive postMessage related communication from a Custom Tabs provider. 
PostMessageServiceConnection A ServiceConnection for Custom Tabs providers to use while connecting to a PostMessageService on the client side. 
PrecomputedTextCompat A text which has the character metrics data. 
PrecomputedTextCompat.Params The information required for building PrecomputedTextCompat. 
PrecomputedTextCompat.Params.Builder A builder for creating PrecomputedTextCompat.Params. 
Preference The basic building block that represents an individual setting displayed to a user in the preference hierarchy. 
Preference.BaseSavedState A base class for managing the instance state of a Preference. 
Preference.OnPreferenceChangeListener Interface definition for a callback to be invoked when the value of this Preference has been changed by the user and is about to be set and/or persisted. 
Preference.OnPreferenceClickListener Interface definition for a callback to be invoked when a Preference is clicked. 
Preference.SummaryProvider<T extends Preference> Interface definition for a callback to be invoked when the summary of this Preference is requested (typically when this preference is added to the hierarchy or its value is updated). 
PreferenceCategory A container that is used to group similar Preferences. 
PreferenceDataStore A data store interface to be implemented and provided to the Preference framework. 
PreferenceDialogFragment This class is deprecated. Use PreferenceDialogFragmentCompat instead  
PreferenceDialogFragmentCompat Abstract base class which presents a dialog associated with a DialogPreference. 
PreferenceFragment This class is deprecated. Use PreferenceFragmentCompat instead  
PreferenceFragment.OnPreferenceDisplayDialogCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to display a dialog. 
PreferenceFragment.OnPreferenceStartFragmentCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a specified fragment. 
PreferenceFragment.OnPreferenceStartScreenCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a new screen of preferences. 
PreferenceFragmentCompat A PreferenceFragmentCompat is the entry point to using the Preference library. 
PreferenceFragmentCompat.OnPreferenceDisplayDialogCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to display a dialog. 
PreferenceFragmentCompat.OnPreferenceStartFragmentCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a specified fragment. 
PreferenceFragmentCompat.OnPreferenceStartScreenCallback Interface that the fragment's containing activity should implement to be able to process preference items that wish to switch to a new screen of preferences. 
PreferenceGroup A container for multiple Preferences. 
PreferenceGroup.PreferencePositionCallback Interface for PreferenceGroup adapters to implement so that PreferenceFragmentCompat.scrollToPreference(String) and PreferenceFragmentCompat.scrollToPreference(Preference) can determine the correct scroll position to request. 
PreferenceManager Used to help create Preference hierarchies from activities or XML. 
PreferenceManager.OnDisplayPreferenceDialogListener Interface definition for a class that will be called when a Preference requests to display a dialog. 
PreferenceManager.OnNavigateToScreenListener Interface definition for a class that will be called when a PreferenceScreen requests navigation. 
PreferenceManager.OnPreferenceTreeClickListener Interface definition for a callback to be invoked when a Preference in the hierarchy rooted at this PreferenceScreen is clicked. 
PreferenceManager.PreferenceComparisonCallback Callback class to be used by the RecyclerView.Adapter associated with the PreferenceScreen, used to determine when two Preference objects are semantically and visually the same. 
PreferenceManager.SimplePreferenceComparisonCallback A basic implementation of PreferenceManager.PreferenceComparisonCallback suitable for use with the default Preference classes. 
PreferenceScreen A top-level container that represents a settings screen. 
PreferenceViewHolder A RecyclerView.ViewHolder class which caches views associated with the default Preference layouts. 
Presenter A Presenter is used to generate Views and bind Objects to them on demand. 
Presenter.ViewHolder ViewHolder can be subclassed and used to cache any view accessors needed to improve binding performance (for example, results of findViewById) without needing to subclass a View. 
Presenter.ViewHolderTask Base class to perform a task on Presenter.ViewHolder. 
PresenterSelector A PresenterSelector is used to obtain a Presenter for a given Object. 
PresenterSwitcher An abstract helper class that switches a view in its parent view using a PresenterSelector. 
PreviewChannel Since API 26, all TV apps may create preview channels and publish them to the home screen. 
PreviewChannel.Builder This builder makes it easy to create a PreviewChannel object by allowing you to chain setters. 
PreviewChannelHelper From a user's perspective, the TV home screen has two types of channels: the single Live Channels row versus the App preview Channels. 
PreviewProgram A convenience class to access TvContractCompat.PreviewPrograms entries in the system content provider. 
PreviewProgram.Builder This Builder class simplifies the creation of a PreviewProgram object. 
PrimaryKey Marks a field in an Entity as the primary key. 
PrintHelper Helper for printing bitmaps. 
PrintHelper.OnPrintFinishCallback Callback for observing when a print operation is completed. 
ProcessLifecycleOwner Class that provides lifecycle for the whole application process. 
Program A convenience class to access TvContractCompat.Programs entries in the system content provider. 
Program.Builder This Builder class simplifies the creation of a Program object. 
ProgressBarManager Manager for showing/hiding progress bar widget. 
Px Denotes that an integer parameter, field or method return value is expected to represent a pixel dimension. 

Q

Query Encapsulates information related to calling ContentResolver.query(Uri, String[], Bundle, CancellationSignal), including the logic determining the best query method to call. 
Query Marks a method in a Dao annotated class as a query method. 

R

RadioButtonListItem Class to build a list item with RadioButton. 
RadioButtonListItem.ViewHolder Holds views of RadioButtonListItem. 
Rating An interface to encapsulate rating information used as content metadata. 
RatingCompat A class to encapsulate rating information used as content metadata. 
RawQuery Marks a method in a Dao annotated class as a raw query method where you can pass the query as a SupportSQLiteQuery. 
RawRes Denotes that an integer parameter, field or method return value is expected to be a raw resource reference. 
ReceivedKeyedAppState A keyed app state received from an app. 
ReceivedKeyedAppState.ReceivedKeyedAppStateBuilder The builder for ReceivedKeyedAppState. 
RecommendationExtender

Helper class to add content info extensions to notifications. 

RecyclerView A flexible view for providing a limited window into a large data set. 
RecyclerView.Adapter<VH extends RecyclerView.ViewHolder> Base class for an Adapter

Adapters provide a binding from an app-specific data set to views that are displayed within a RecyclerView. 

RecyclerView.AdapterDataObserver Observer base class for watching changes to an RecyclerView.Adapter. 
RecyclerView.ChildDrawingOrderCallback A callback interface that can be used to alter the drawing order of RecyclerView children. 
RecyclerView.EdgeEffectFactory EdgeEffectFactory lets you customize the over-scroll edge effect for RecyclerViews. 
RecyclerView.EdgeEffectFactory.EdgeDirection  
RecyclerView.ItemAnimator This class defines the animations that take place on items as changes are made to the adapter. 
RecyclerView.ItemAnimator.AdapterChanges The set of flags that might be passed to RecyclerView.ItemAnimator.recordPreLayoutInformation(State, ViewHolder, int, List). 
RecyclerView.ItemAnimator.ItemAnimatorFinishedListener This interface is used to inform listeners when all pending or running animations in an ItemAnimator are finished. 
RecyclerView.ItemAnimator.ItemHolderInfo A simple data structure that holds information about an item's bounds. 
RecyclerView.ItemDecoration An ItemDecoration allows the application to add a special drawing and layout offset to specific item views from the adapter's data set. 
RecyclerView.LayoutManager A LayoutManager is responsible for measuring and positioning item views within a RecyclerView as well as determining the policy for when to recycle item views that are no longer visible to the user. 
RecyclerView.LayoutManager.LayoutPrefetchRegistry Interface for LayoutManagers to request items to be prefetched, based on position, with specified distance from viewport, which indicates priority. 
RecyclerView.LayoutManager.Properties Some general properties that a LayoutManager may want to use. 
RecyclerView.LayoutParams LayoutParams subclass for children of RecyclerView. 
RecyclerView.OnChildAttachStateChangeListener A Listener interface that can be attached to a RecylcerView to get notified whenever a ViewHolder is attached to or detached from RecyclerView. 
RecyclerView.OnFlingListener This class defines the behavior of fling if the developer wishes to handle it. 
RecyclerView.OnItemTouchListener An OnItemTouchListener allows the application to intercept touch events in progress at the view hierarchy level of the RecyclerView before those touch events are considered for RecyclerView's own scrolling behavior. 
RecyclerView.OnScrollListener An OnScrollListener can be added to a RecyclerView to receive messages when a scrolling event has occurred on that RecyclerView. 
RecyclerView.RecycledViewPool RecycledViewPool lets you share Views between multiple RecyclerViews. 
RecyclerView.Recycler A Recycler is responsible for managing scrapped or detached item views for reuse. 
RecyclerView.RecyclerListener A RecyclerListener can be set on a RecyclerView to receive messages whenever a view is recycled. 
RecyclerView.SimpleOnItemTouchListener An implementation of RecyclerView.OnItemTouchListener that has empty method bodies and default return values. 
RecyclerView.SmoothScroller Base class for smooth scrolling. 
RecyclerView.SmoothScroller.Action Holds information about a smooth scroll request by a RecyclerView.SmoothScroller. 
RecyclerView.SmoothScroller.ScrollVectorProvider An interface which is optionally implemented by custom RecyclerView.LayoutManager to provide a hint to a RecyclerView.SmoothScroller about the location of the target position. 
RecyclerView.State

Contains useful information about the current RecyclerView state like target scroll position or view focus. 

RecyclerView.ViewCacheExtension ViewCacheExtension is a helper class to provide an additional layer of view caching that can be controlled by the developer. 
RecyclerView.ViewHolder A ViewHolder describes an item view and metadata about its place within the RecyclerView. 
RecyclerViewAccessibilityDelegate The AccessibilityDelegate used by RecyclerView. 
RecyclerViewAccessibilityDelegate.ItemDelegate The default implementation of accessibility delegate for the individual items of the RecyclerView. 
RecyclerViewParallax Implementation of Parallax class for RecyclerView. 
RecyclerViewParallax.ChildPositionProperty Subclass of Parallax.IntProperty. 
Relation A convenience annotation which can be used in a Pojo to automatically fetch relation entities. 
RemoteActionCompat Represents a remote action that can be called from another process. 
RemoteCallable Used to tag a method as callable using CallbackReceiver.createRemoteCallback(Context). 
RemoteCallback An instance of a callback to a specific class/method with a specific set of arguments. 
RemoteCallbackProcessor Processes annotations from RemoteCallbacks. 
RemoteInput Helper for using the RemoteInput. 
RemoteInput.Builder Builder class for RemoteInput objects. 
RemotePlaybackClient A helper class for playing media on remote routes using the remote playback protocol defined by MediaControlIntent. 
RemotePlaybackClient.ActionCallback Base callback type for remote playback requests. 
RemotePlaybackClient.ItemActionCallback Callback for remote playback requests that operate on items. 
RemotePlaybackClient.OnMessageReceivedListener A callback that will receive messages from media sessions. 
RemotePlaybackClient.SessionActionCallback Callback for remote playback requests that operate on sessions. 
RemotePlaybackClient.StatusCallback A callback that will receive media status updates. 
RequiresApi Denotes that the annotated element should only be called on the given API level or higher. 
RequiresFeature Denotes that the annotated element requires one or more features. 
RequiresPermission Denotes that the annotated element requires (or may require) one or more permissions. 
RequiresPermission.Read Specifies that the given permission is required for read operations. 
RequiresPermission.Write Specifies that the given permission is required for write operations. 
ResolvableFuture<V> An AndroidX version of Guava's SettableFuture. 
ResourceCursorAdapter Static library support version of the framework's ResourceCursorAdapter. 
ResourcesCompat Helper for accessing features in Resources. 
ResourcesCompat.FontCallback Interface used to receive asynchronous font fetching events. 
RestrictTo Denotes that the annotated element should only be accessed from within a specific scope (as defined by RestrictTo.Scope). 
RestrictTo.Scope  
RichText A RichText is an immutable sequence of graphic elements (e.g.: text, images) to be displayed one after another. 
RichText.Builder Builder for creating a RichText  
RichTextElement An item in a RichText sequence, acting as a union of different graphic elements that can be displayed one after another. 
RichTextElement.Builder Builder for creating a RichTextElement  
Room Utility class for Room. 
RoomDatabase Base class for all Room databases. 
RoomDatabase.Builder<T extends RoomDatabase> Builder for RoomDatabase. 
RoomDatabase.Callback Callback for RoomDatabase. 
RoomDatabase.JournalMode Journal modes for SQLite database. 
RoomDatabase.MigrationContainer A container to hold migrations. 
RoomWarnings The list of warnings that are produced by Room. 
RoundedBitmapDrawable A Drawable that wraps a bitmap and can be drawn with rounded corners. 
RoundedBitmapDrawableFactory Constructs RoundedBitmapDrawable objects, either from Bitmaps directly, or from streams and files. 
RoundedDrawable Maintains and draws a drawable inside rounded rectangular bounds. 
Row The base class for all rows. 
RowHeaderPresenter RowHeaderPresenter provides a default presentation for HeaderItem using a RowHeaderView and optionally a TextView for description. 
RowHeaderPresenter.ViewHolder A ViewHolder for the RowHeaderPresenter. 
RowHeaderView RowHeaderView is a header text view. 
RowPresenter An abstract Presenter that renders an Object in RowsFragment, the object can be subclass Row or a generic one. 
RowPresenter.ViewHolder A ViewHolder for a Row. 
RowsFragment This class is deprecated. use RowsSupportFragment  
RowsFragment.MainFragmentAdapter  
RowsFragment.MainFragmentRowsAdapter This class is deprecated. use RowsSupportFragment  
RowsSupportFragment An ordered set of rows of leanback widgets. 
RowsSupportFragment.MainFragmentAdapter  
RowsSupportFragment.MainFragmentRowsAdapter The adapter that RowsSupportFragment implements BrowseSupportFragment.MainFragmentRowsAdapter. 
RxPagedListBuilder<Key, Value> Builder for Observable<PagedList> or Flowable<PagedList>, given a DataSource.Factory and a PagedList.Config. 
RxRoom Helper class to add RxJava2 support to Room. 
RxWorker RxJava2 interoperability Worker implementation. 

S

SafeBrowsingResponseCompat Compatibility version of SafeBrowsingResponse. 
SavedStateHandle A handle to saved state passed down to ViewModel. 
SavedStateRegistry An interface for plugging components that consumes and contributes to the saved state. 
SavedStateRegistry.AutoRecreated Subclasses of this interface will be automatically recreated if they were previously registered via {SavedStateRegistry.runOnNextRecreation(Class)}. 
SavedStateRegistry.SavedStateProvider This interface marks a component that contributes to saved state. 
SavedStateRegistryController An API for SavedStateRegistryOwner implementations to control SavedStateRegistry. 
SavedStateRegistryOwner A scope that owns SavedStateRegistry  
SavedStateVMFactory ViewModelProvider.Factory that can create ViewModels accessing and contributing to a saved state via SavedStateHandle received in a constructor. 
ScaleGestureDetectorCompat Helper for accessing features in ScaleGestureDetector. 
Scene A scene represents the collection of values that various properties in the View hierarchy will have when the scene is applied. 
ScrollerCompat This class is deprecated. Use OverScroller directly.  
ScrollingView An interface that can be implemented by Views to provide scroll related APIs. 
SearchBar A search widget containing a search orb and a text entry view. 
SearchBar.SearchBarListener Interface for receiving notification of search query changes. 
SearchBar.SearchBarPermissionListener Interface that handles runtime permissions requests. 
SearchEditText EditText widget that monitors keyboard changes. 
SearchEditText.OnKeyboardDismissListener Interface for receiving notification when the keyboard is dismissed. 
SearchFragment This class is deprecated. use SearchSupportFragment  
SearchFragment.SearchResultProvider Search API to be provided by the application. 
SearchOrbView

A widget that draws a search affordance, represented by a round background and an icon. 

SearchOrbView.Colors A set of colors used to display the search orb. 
SearchSupportFragment A fragment to handle searches. 
SearchSupportFragment.SearchResultProvider Search API to be provided by the application. 
SearchView A widget that provides a user interface for the user to enter a search query and submit a request to a search provider. 
SearchView.OnCloseListener  
SearchView.OnQueryTextListener Callbacks for changes to the query text. 
SearchView.OnSuggestionListener Callback interface for selection events on suggestions. 
SectionRow Used to represent section item in HeadersFragment. 
SeekbarListItem Class to build a list item with SeekBar. 
SeekbarListItem.ViewHolder Holds views of SeekbarListItem. 
SeekBarPreference Preference based on android.preference.SeekBarPreference but uses support preference as a base . 
Segment Information regarding a road, street, highway, etc. 
Selection<K> Object representing a "primary" selection and a "provisional" selection. 
SelectionPredicates Utility class for creating SelectionPredicate instances. 
SelectionTracker<K> SelectionTracker provides support for managing a selection of items in a RecyclerView instance. 
SelectionTracker.Builder<K> Builder is the primary mechanism for create a SelectionTracker that can be used with your RecyclerView. 
SelectionTracker.SelectionObserver<K> Observer class providing access to information about Selection state changes. 
SelectionTracker.SelectionPredicate<K> Implement SelectionPredicate to control when items can be selected or unselected. 
ServiceCompat Helper for accessing features in Service. 
ServiceLifecycleDispatcher Helper class to dispatch lifecycle events for a service. 
ServiceWorkerClientCompat Base class for clients to capture Service Worker related callbacks, see ServiceWorkerControllerCompat for usage example. 
ServiceWorkerControllerCompat Manages Service Workers used by WebView. 
ServiceWorkerWebSettingsCompat Manages settings state for all Service Workers. 
SessionCommand Define a command that a MediaController can send to a MediaSession. 
SessionCommandGroup A set of SessionCommand which represents a command group. 
SessionCommandGroup.Builder Builds a SessionCommandGroup object. 
SessionPlayer Base interface for all media players that want media session. 
SessionPlayer.PlayerCallback A callback class to receive notifications for events on the session player. 
SessionPlayer.PlayerResult Result class of the asynchronous APIs. 
SessionToken Represents an ongoing MediaSession or a MediaSessionService. 
Settings Provides various preferences affecting Leanback runtime behavior. 
ShadowOverlayContainer Provides an SDK version-independent wrapper to support shadows, color overlays, and rounded corners. 
ShadowOverlayHelper ShadowOverlayHelper is a helper class for shadow, overlay color and rounded corner. 
ShadowOverlayHelper.Builder Builder for creating ShadowOverlayHelper. 
ShadowOverlayHelper.Options Option values for ShadowOverlayContainer. 
ShareActionProvider Provides a share action, which is suitable for an activity's app bar. 
ShareActionProvider.OnShareTargetSelectedListener Listener for the event of selecting a share target. 
ShareCompat Extra helper functionality for sharing data between activities. 
ShareCompat.IntentBuilder IntentBuilder is a helper for constructing Intent.ACTION_SEND and Intent.ACTION_SEND_MULTIPLE sharing intents and starting activities to share content. 
ShareCompat.IntentReader IntentReader is a helper for reading the data contained within a sharing (ACTION_SEND) Intent. 
SharedElementCallback Listener provided in Activity.setEnterSharedElementCallback(SharedElementCallback) and Activity.setExitSharedElementCallback(SharedElementCallback) to monitor the Activity transitions. 
SharedElementCallback.OnSharedElementsReadyListener Listener to be called after SharedElementCallback.onSharedElementsArrived(List, List, OnSharedElementsReadyListener) when the shared elements are ready to be hidden in the source Activity and shown in the destination Activity. 
SharedPreferencesCompat This class is deprecated. This compatibility class is no longer required. Use SharedPreferences directly.  
SharedPreferencesCompat.EditorCompat This class is deprecated. This compatibility class is no longer required. Use SharedPreferences.Editor directly.  
ShortcutInfoCompat Helper for accessing features in ShortcutInfo. 
ShortcutInfoCompat.Builder Builder class for ShortcutInfoCompat objects. 
ShortcutManagerCompat Helper for accessing features in ShortcutManager. 
SidePropagation A TransitionPropagation that propagates based on the distance to the side and, orthogonally, the distance to epicenter. 
SimpleArrayMap<K, V> Base implementation of ArrayMap that doesn't include any standard Java container API interoperability. 
SimpleCursorAdapter Static library support version of the framework's SimpleCursorAdapter. 
SimpleCursorAdapter.CursorToStringConverter This class can be used by external clients of SimpleCursorAdapter to define how the Cursor should be converted to a String. 
SimpleCursorAdapter.ViewBinder This class can be used by external clients of SimpleCursorAdapter to bind values fom the Cursor to views. 
SimpleItemAnimator A wrapper class for ItemAnimator that records View bounds and decides whether it should run move, change, add or remove animations. 
SimpleSQLiteQuery A basic implementation of SupportSQLiteQuery which receives a query and its args and binds args based on the passed in Object type. 
SinglePresenterSelector A PresenterSelector that always returns the same Presenter. 
Size Denotes that the annotated element should have a given size or length. 
SkipQueryVerification Skips database verification for the annotated element. 
Slice A slice is a piece of app content and actions that can be surfaced outside of the app. 
SliceAction Class representing an action, supports tappable icons, custom toggle icons, and default toggles. 
SliceAction Interface for a slice action, supports tappable icons, custom toggle icons, and default toggles. 
SliceConvert Convert between androidx.slice.Slice and android.app.slice.Slice  
SliceItem A SliceItem is a single unit in the tree structure of a Slice. 
SliceLiveData Class with factory methods for creating LiveData that observes slices. 
SliceLiveData.OnErrorListener Listener for errors when using SliceLiveData.fromStream(Context, InputStream, OnErrorListener). 
SliceLiveData.OnErrorListener.ErrorType  
SliceManager Class to handle interactions with Slices. 
SliceMetadata Utility class to parse a Slice and provide access to information around its contents. 
SliceProvider A SliceProvider allows an app to provide Slices to the Android OS. 
SliceStructure Class used to see if two Slices are structurally equivalent ignoring specific content such as text or icons. 
SliceUtils Utilities for dealing with slices. 
SliceUtils.SerializeOptions Holds options for how to handle SliceItems that cannot be serialized. 
SliceUtils.SliceActionListener A listener used to receive events on slices parsed with SliceUtils.parseSlice(Context, InputStream, String, SliceActionListener). 
SliceUtils.SliceParseException Exception thrown during SliceUtils.parseSlice(Context, InputStream, String, SliceActionListener). 
SliceView A view for displaying Slices. 
SliceView.OnSliceActionListener Implement this interface to be notified of interactions with the slice displayed in this view. 
SliceViewManager Class to handle interactions with Slices. 
SliceViewManager.SliceCallback Class that listens to changes in Slices. 
Slide This transition tracks changes to the visibility of target views in the start and end scenes and moves views in or out from one of the edges of the scene. 
SlidingPaneLayout SlidingPaneLayout provides a horizontal, multi-pane layout for use at the top level of a UI. 
SlidingPaneLayout.LayoutParams  
SlidingPaneLayout.PanelSlideListener Listener for monitoring events about sliding panes. 
SlidingPaneLayout.SimplePanelSlideListener No-op stubs for SlidingPaneLayout.PanelSlideListener. 
SnapHelper Class intended to support snapping for a RecyclerView. 
SortedList<T> A Sorted list implementation that can keep items in order and also notify for changes in the list such that it can be bound to a RecyclerView.Adapter. 
SortedList.BatchedCallback<T2> A callback implementation that can batch notify events dispatched by the SortedList. 
SortedList.Callback<T2> The class that controls the behavior of the SortedList. 
SortedListAdapterCallback<T2> A SortedList.Callback implementation that can bind a SortedList to a RecyclerView.Adapter. 
Space This class is deprecated. Use framework Space class instead.  
SparseArrayCompat<E> SparseArrays map integers to Objects. 
SparseArrayObjectAdapter An ObjectAdapter implemented with a SparseArray. 
SpeechOrbView A subclass of SearchOrbView that visualizes the state of an ongoing speech recognition. 
SpeechRecognitionCallback This interface is deprecated. Launching voice recognition activity is no longer supported. App should declare android.permission.RECORD_AUDIO in AndroidManifest file. See details in SearchSupportFragment.  
SpringAnimation SpringAnimation is an animation that is driven by a SpringForce. 
SpringForce Spring Force defines the characteristics of the spring being used in the animation. 
SQLiteCursorCompat Helper for accessing features in AbstractWindowedCursor  
StableIdKeyProvider An ItemKeyProvider that provides stable ids by way of cached RecyclerView.Adapter stable ids. 
StaggeredGridLayoutManager A LayoutManager that lays out children in a staggered grid formation. 
StaggeredGridLayoutManager.LayoutParams LayoutParams used by StaggeredGridLayoutManager. 
StarRating A class for rating expressed as the number of stars. 
StatefulAdapter ViewPager2 adapters should implement this interface to be called during View.onSaveInstanceState() and View.onRestoreInstanceState(Parcelable)  
Step An action that the driver should take in order to remain on the current navigation route. 
Step.Builder Builder for creating a Step  
StorageStrategy<K> Strategy for storing keys in saved state. 
StringDef Denotes that the annotated String element, represents a logical type and that its value should be one of the explicitly named constants. 
StringRes Denotes that an integer parameter, field or method return value is expected to be a String resource reference (e.g. 
StyleableRes Denotes that an integer parameter, field or method return value is expected to be a styleable resource reference (e.g. 
StyleRes Denotes that an integer parameter, field or method return value is expected to be a style resource reference (e.g. 
SubheaderListItem Class to build a sub-header list item. 
SubheaderListItem.TextStartMarginType  
SubheaderListItem.ViewHolder Holds views of SubHeaderListItem. 
SubtitleData Class encapsulating subtitle data, as received through the MediaPlayer.PlayerCallback.onSubtitleData(MediaPlayer, MediaItem, SubtitleData) interface. 
Supplier<T> Compat version of Supplier 
SupportSQLiteDatabase A database abstraction which removes the framework dependency and allows swapping underlying sql versions. 
SupportSQLiteOpenHelper An interface to map the behavior of SQLiteOpenHelper. 
SupportSQLiteOpenHelper.Callback Handles various lifecycle events for the SQLite connection, similar to SQLiteOpenHelper. 
SupportSQLiteOpenHelper.Configuration The configuration to create an SQLite open helper object using SupportSQLiteOpenHelper.Factory. 
SupportSQLiteOpenHelper.Configuration.Builder Builder class for SupportSQLiteOpenHelper.Configuration. 
SupportSQLiteOpenHelper.Factory Factory class to create instances of SupportSQLiteOpenHelper using SupportSQLiteOpenHelper.Configuration. 
SupportSQLiteProgram An interface to map the behavior of SQLiteProgram. 
SupportSQLiteQuery A query with typed bindings. 
SupportSQLiteQueryBuilder A simple query builder to create SQL SELECT queries. 
SupportSQLiteStatement An interface to map the behavior of SQLiteStatement. 
SurfaceHolderGlueHost Optional interface to be implemented by any subclass of PlaybackGlueHost that contains a SurfaceView. 
SwipeDismissFrameLayout A layout enabling left-to-right swipe-to-dismiss, intended for use within an activity. 
SwipeDismissFrameLayout.Callback Implement this callback to act on particular stages of the dismissal. 
SwipeRefreshLayout The SwipeRefreshLayout should be used whenever the user can refresh the contents of a view via a vertical swipe gesture. 
SwipeRefreshLayout.OnChildScrollUpCallback Classes that wish to override SwipeRefreshLayout.canChildScrollUp() method behavior should implement this interface. 
SwipeRefreshLayout.OnRefreshListener Classes that wish to be notified when the swipe gesture correctly triggers a refresh should implement this interface. 
SwitchCompat SwitchCompat is a version of the Switch widget which on devices back to API v7. 
SwitchListItem Class to build a list item with Switch. 
SwitchListItem.ViewHolder Holds views of SwitchListItem. 
SwitchPreference A Preference that provides a two-state toggleable option. 
SwitchPreferenceCompat A Preference that provides a two-state toggleable option. 
SynchronousExecutor Is an implementation of a Executor which executes Runnable's synchronously. 

T

Target A class which allows custom selection of colors in a Palette's generation. 
Target.Builder Builder class for generating custom Target instances. 
TaskStackBuilder Utility class for constructing synthetic back stacks for cross-task navigation on Android 3.0 and newer. 
TaskStackBuilder.SupportParentable  
TemplateSliceBuilder Base class of builders of various template types. 
TestDriver Additional functionality exposed for WorkManager that are useful in the context of testing. 
TextClassification Information for generating a widget to handle classified text. 
TextClassification.Builder Builder for building TextClassification objects. 
TextClassification.Request A request object for generating TextClassification. 
TextClassification.Request.Builder A builder for building TextClassification requests. 
TextClassificationContext A representation of the context in which text classification would be performed. 
TextClassificationContext.Builder A builder for building a TextClassification context. 
TextClassificationManager Class to handle the creation of TextClassifier. 
TextClassificationSessionId This class represents the id of a text classification session. 
TextClassifier Interface for providing text classification related features. 
TextClassifier.EntityConfig Configuration object for specifying what entities to identify. 
TextClassifier.EntityConfig.Builder Builder class to construct the TextClassifier.EntityConfig object. 
TextDirectionHeuristicCompat Interface for objects that use a heuristic for guessing at the paragraph direction by examining text. 
TextDirectionHeuristicsCompat Some objects that implement TextDirectionHeuristic. 
TextLinks A collection of links, representing subsequences of text and the entity types (phone number, address, url, etc) they may be. 
TextLinks.Builder A builder to construct a TextLinks instance. 
TextLinks.DefaultTextLinkSpan The default implementation of TextLinks.TextLinkSpan. 
TextLinks.Request A request object for generating TextLinks. 
TextLinks.Request.Builder A builder for building TextLinks requests. 
TextLinks.SpanFactory A factory to create spans from TextLinks. 
TextLinks.TextLink A link, identifying a substring of text and possible entity types for it. 
TextLinks.TextLinkSpan A ClickableSpan for a TextLink. 
TextLinks.TextLinkSpanData Contains necessary data for TextLinks.TextLinkSpan. 
TextLinksParams Used to specify how to apply links when using TextLinks.apply(Spannable, TextClassifier, TextLinksParams) APIs. 
TextLinksParams.Builder A builder for building TextLinksParams. 
TextListItem Class to build a list item of text. 
TextListItem.ViewHolder Holds views of TextListItem. 
TextSelection Information about where text selection should be. 
TextSelection.Builder Builder used to build TextSelection objects. 
TextSelection.Request A request object for generating TextSelection. 
TextSelection.Request.Builder A builder for building TextSelection requests. 
TextUtilsCompat Backwards compatible version of TextUtils. 
TextViewCompat Helper for accessing features in TextView. 
ThemedSpinnerAdapter An extension of SpinnerAdapter that is capable of inflating drop-down views against a different theme than normal views. 
ThemedSpinnerAdapter.Helper A helper class which allows easy integration of ThemedSpinnerAdapter into existing SpinnerAdapters in a backwards compatible way. 
ThumbRating A class for rating with a single degree of rating, "thumb up" vs "thumb down". 
TimedMetaData Class that embodies one timed metadata access unit, including
  • a time stamp, and
  • raw uninterpreted byte-array extracted directly from the container. 
TimePicker TimePicker is a direct subclass of Picker. 
TintableBackgroundView Interface which allows a View to receive background tinting calls from ViewCompat when running on API v20 devices or lower. 
TintableCompoundButton Interface which allows a CompoundButton to receive tinting calls from CompoundButtonCompat when running on API v20 devices or lower. 
TintableCompoundDrawablesView Interface which allows TextView and subclasses to tint compound drawables with TextViewCompat when running on API v22 devices or lower. 
TitleHelper Helper for managing TitleView, including transitions and focus movement. 
TitleView Title view for a leanback fragment. 
TitleViewAdapter This class allows a customized widget class to implement TitleViewAdapter.Provider and expose TitleViewAdapter methods to containing fragment (e.g. 
TitleViewAdapter.Provider Interface to be implemented by a customized widget class to implement TitleViewAdapter. 
Toolbar A standard toolbar for use within application content. 
Toolbar.LayoutParams Layout information for child views of Toolbars. 
Toolbar.OnMenuItemClickListener Interface responsible for receiving menu item click events if the items themselves do not have individual item click listeners. 
Toolbar.SavedState  
TooltipCompat Helper class used to emulate the behavior of View.setTooltipText(CharSequence) prior to API level 26. 
TraceCompat Writes trace events to the system trace buffer. 
TrafficStatsCompat Helper for accessing features in TrafficStats. 
Transaction Marks a method in a Dao class as a transaction method. 
Transformations Transformation methods for LiveData. 
Transition A Transition holds information about animations that will be run on its targets during a scene change. 
Transition.EpicenterCallback Class to get the epicenter of Transition. 
Transition.TransitionListener A transition listener receives notifications from a transition. 
TransitionInflater This class inflates scenes and transitions from resource files. 
TransitionListenerAdapter This adapter class provides empty implementations of the methods from Transition.TransitionListener. 
TransitionManager This class manages the set of transitions that fire when there is a change of Scene. 
TransitionPropagation Extend TransitionPropagation to customize start delays for Animators created in Transition.createAnimator(ViewGroup, TransitionValues, TransitionValues). 
TransitionRes Denotes that an integer parameter, field or method return value is expected to be a transition resource reference. 
TransitionSet A TransitionSet is a parent of child transitions (including other TransitionSets). 
TransitionValues Data structure which holds cached values for the transition. 
TrustedWebUtils Class for utilities and convenience calls for opening a qualifying web page as a Trusted Web Activity. 
TvContractCompat The contract between the TV provider and applications. 
TvContractCompat.BaseTvColumns Common base for the tables of TV channels/programs. 
TvContractCompat.Channels Column definitions for the TV channels table. 
TvContractCompat.Channels.Logo A sub-directory of a single TV channel that represents its primary logo. 
TvContractCompat.PreviewPrograms Column definitions for the preview TV programs table. 
TvContractCompat.Programs Column definitions for the TV programs table. 
TvContractCompat.Programs.Genres Canonical genres for TV programs. 
TvContractCompat.RecordedPrograms Column definitions for the recorded TV programs table. 
TvContractCompat.WatchNextPrograms Column definitions for the "watch next" TV programs table. 
TwoStatePreference Common base class for preferences that have two selectable states, save a boolean value, and may have dependent preferences that are enabled/disabled based on the current state. 
TypeConverter Marks a method as a type converter. 
TypeConverters Specifies additional type converters that Room can use. 
TypefaceCompat Helper for accessing features in Typeface. 

U

UiThread Denotes that the annotated method or constructor should only be called on the UI thread. 
Update Marks a method in a Dao annotated class as an update method. 
UriMediaItem Structure for media item descriptor for Uri. 
UriMediaItem.Builder This Builder class simplifies the creation of a UriMediaItem object. 
UserManagerCompat Helper for accessing features in UserManager in a backwards compatible fashion. 

V

VectorDrawableCompat For API 24 and above, this class delegates to the framework's VectorDrawable. 
VelocityTrackerCompat This class is deprecated. Use VelocityTracker directly.  
VersionedParcelable Tags a class that can be used with ParcelUtils. 
VerticalGridFragment This class is deprecated. use VerticalGridSupportFragment  
VerticalGridPresenter A presenter that renders objects in a VerticalGridView. 
VerticalGridPresenter.ViewHolder ViewHolder for the VerticalGridPresenter. 
VerticalGridSupportFragment A fragment for creating leanback vertical grids. 
VerticalGridView A ViewGroup that shows items in a vertically scrolling list. 
VideoFragment This class is deprecated. use VideoSupportFragment  
VideoFragmentGlueHost This class is deprecated. use VideoSupportFragmentGlueHost  
VideoSize Immutable class for describing video size. 
VideoSupportFragment Subclass of PlaybackSupportFragment that is responsible for providing a SurfaceView and rendering video. 
VideoSupportFragmentGlueHost PlaybackGlueHost implementation the interaction between PlaybackGlue and VideoSupportFragment. 
ViewCompat Helper for accessing features in View. 
ViewCompat This class is deprecated. Use ViewCompat instead.  
ViewCompat.OnUnhandledKeyEventListenerCompat Interface definition for a callback to be invoked when a hardware key event hasn't been handled by the view hierarchy. 
ViewConfigurationCompat Helper for accessing features in ViewConfiguration. 
ViewDragHelper ViewDragHelper is a utility class for writing custom ViewGroups. 
ViewDragHelper.Callback A Callback is used as a communication channel with the ViewDragHelper back to the parent view using it. 
ViewGroupCompat Helper for accessing features in ViewGroup. 
ViewHolderTask Interface for schedule task on a ViewHolder. 
ViewModel ViewModel is a class that is responsible for preparing and managing the data for an Activity or a Fragment. 
ViewModelProvider An utility class that provides ViewModels for a scope. 
ViewModelProvider.AndroidViewModelFactory ViewModelProvider.Factory which may create AndroidViewModel and ViewModel, which have an empty constructor. 
ViewModelProvider.Factory Implementations of Factory interface are responsible to instantiate ViewModels. 
ViewModelProvider.NewInstanceFactory Simple factory, which calls empty constructor on the give class. 
ViewModelProviders Utilities methods for ViewModelStore class. 
ViewModelProviders.DefaultFactory This class is deprecated. Use ViewModelProvider.AndroidViewModelFactory  
ViewModelStore Class to store ViewModels. 
ViewModelStoreOwner A scope that owns ViewModelStore. 
ViewModelStores This class is deprecated. Use ComponentActivity.getViewModelStore() or Fragment.getViewModelStore() to retrieve a ViewModelStore directly from activities and fragments.  
ViewPager Layout manager that allows the user to flip left and right through pages of data. 
ViewPager.DecorView Annotation which allows marking of views to be decoration views when added to a view pager. 
ViewPager.LayoutParams Layout parameters that should be supplied for views added to a ViewPager. 
ViewPager.OnAdapterChangeListener Callback interface for responding to adapter changes. 
ViewPager.OnPageChangeListener Callback interface for responding to changing state of the selected page. 
ViewPager.PageTransformer A PageTransformer is invoked whenever a visible/attached page is scrolled. 
ViewPager.SavedState This is the persistent state that is saved by ViewPager. 
ViewPager.SimpleOnPageChangeListener Simple implementation of the ViewPager.OnPageChangeListener interface with stub implementations of each method. 
ViewPager2 ViewPager2 replaces ViewPager, addressing most of its predecessor’s pain-points, including right-to-left layout support, vertical orientation, modifiable Fragment collections, etc. 
ViewPager2.OnPageChangeCallback Callback interface for responding to changing state of the selected page. 
ViewPager2.Orientation  
ViewPager2.PageTransformer A PageTransformer is invoked whenever a visible/attached page is scrolled. 
ViewPager2.ScrollState  
ViewParentCompat Helper for accessing features in ViewParent. 
ViewPropertyAnimatorCompat  
ViewPropertyAnimatorListener

An animation listener receives notifications from an animation. 

ViewPropertyAnimatorListenerAdapter This adapter class provides empty implementations of the methods from ViewPropertyAnimatorListener. 
ViewPropertyAnimatorUpdateListener Implementors of this interface can add themselves as update listeners to an ViewPropertyAnimatorCompat instance to receive callbacks on every animation frame, after the current frame's values have been calculated for that ViewPropertyAnimatorCompat. 
Visibility This transition tracks changes to the visibility of target views in the start and end scenes. 
VisibilityPropagation Base class for TransitionPropagations that care about View Visibility and the center position of the View. 
VisibleForTesting Denotes that the class, method or field has its visibility relaxed, so that it is more widely visible than otherwise necessary to make code testable. 
VolumeProviderCompat Handles requests to adjust or set the volume on a session. 
VolumeProviderCompat.Callback Listens for changes to the volume. 

W

WakefulBroadcastReceiver This class is deprecated. As of Android O, background check restrictions make this class no longer generally useful. (It is generally not safe to start a service from the receipt of a broadcast, because you don't have any guarantees that your app is in the foreground at this point and thus allowed to do so.) Instead, developers should use android.app.job.JobScheduler to schedule a job, and this does not require that the app hold a wake lock while doing so (the system will take care of holding a wake lock for the job).  
WatchNextProgram A convenience class to access TvContractCompat.WatchNextPrograms entries in the system content provider. 
WatchNextProgram.Builder This Builder class simplifies the creation of a WatchNextProgram object. 
WearableActionDrawerView Ease of use class for creating a Wearable action drawer. 
WearableDrawerController Provides the ability to manipulate a WearableDrawerView's position within a WearableDrawerLayout. 
WearableDrawerLayout Top-level container that allows interactive drawers to be pulled from the top and bottom edge of the window. 
WearableDrawerLayout.DrawerStateCallback Listener for monitoring events about drawers. 
WearableDrawerView View that contains drawer content and a peeking view for use with WearableDrawerLayout. 
WearableLinearLayoutManager This wear-specific implementation of LinearLayoutManager provides basic offsetting logic for updating child layout. 
WearableLinearLayoutManager.LayoutCallback Callback for interacting with layout passes. 
WearableNavigationDrawerView Ease of use class for creating a Wearable navigation drawer. 
WearableNavigationDrawerView.OnItemSelectedListener Listener which is notified when the user selects an item. 
WearableNavigationDrawerView.WearableNavigationDrawerAdapter Adapter for specifying the contents of WearableNavigationDrawer. 
WearableRecyclerView Wearable specific implementation of the RecyclerView enabling setCircularScrollingGestureEnabled(boolean) circular scrolling} and semi-circular layouts. 
WebMessageCompat The Java representation of the HTML5 PostMessage event. 
WebMessagePortCompat

The Java representation of the HTML5 message ports. 

WebMessagePortCompat.WebMessageCallbackCompat The listener for handling MessagePort events. 
WebResourceErrorCompat Compatibility version of WebResourceError. 
WebResourceRequestCompat Compatibility version of WebResourceRequest. 
WebSettingsCompat Compatibility version of WebSettings  
WebViewClientCompat Compatibility version of WebViewClient. 
WebViewCompat Compatibility version of WebView  
WebViewCompat.VisualStateCallback Callback interface supplied to WebViewCompat.postVisualStateCallback(WebView, long, WebViewCompat.VisualStateCallback) for receiving notifications about the visual state. 
WebViewFeature Utility class for checking which WebView Support Library features are supported on the device. 
WindowCompat Helper for accessing features in Window. 
WindowInsetsCompat Describes a set of insets for window content. 
WorkContinuation A class that allows you to chain together OneTimeWorkRequests. 
Worker A class that performs work synchronously on a background thread provided by WorkManager. 
WorkerFactory A factory object that creates ListenableWorker instances. 
WorkerParameters Setup parameters for a ListenableWorker. 
WorkerThread Denotes that the annotated method should only be called on a worker thread. 
WorkInfo Information about a particular WorkRequest containing the id of the WorkRequest, its current WorkInfo.State, output, and tags. 
WorkInfo.State The current lifecycle state of a WorkRequest. 
WorkManager WorkManager is a library used to enqueue deferrable work that is guaranteed to execute sometime after its Constraints are met. 
WorkManagerTestInitHelper Helps initialize WorkManager for testing. 
WorkRequest The base class for specifying parameters for work that should be enqueued in WorkManager. 
WorkRequest.Builder<B extends Builder, W extends WorkRequest> A builder for WorkRequests. 

X

XmlRes Denotes that an integer parameter, field or method return value is expected to be an XML resource reference.