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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. 
AbstractSavedStateViewModelFactory 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. 
AccessibilityNodeInfoCompat.TouchDelegateInfoCompat Class with information of touch delegated views and regions. 
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.Delegate  
ActionBarDrawerToggle.DelegateProvider Allows an implementing Activity to return an ActionBarDrawerToggle.Delegate to use with ActionBarDrawerToggle. 
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.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. 
AdvertisingIdClient Client for retrieving Advertising ID related info from an AndroidX ID Provider installed on the device. 
AdvertisingIdInfo Advertising ID Information. 
AdvertisingIdNotAvailableException Indicates an AndroidX Advertising ID is not available. 
AdvertisingIdProvider The class for the AndroidX Advertising ID Provider that should provide the resettable ID and LAT preference should implement this interface. 
AdvertisingIdProviderInfo A AdvertisingIdProviderInfo represents the information about an Advertising ID Provider installed on the device. 
AdvertisingIdProviderManager The AdvertisingIdProviderManager will be used by an Advertising ID Provider to register the provider implementation or retrieve all the Advertising ID Providers on the device. 
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. 
AutoImageCaptureExtender Load the OEM extension implementation for auto effect type. 
AutoPreviewExtender Load the OEM extension Preview implementation for auto effect type. 
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. 
BeautyImageCaptureExtender Load the OEM extension implementation for beauty effect type. 
BeautyPreviewExtender Load the OEM extension Preview implementation for beauty effect type. 
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. 
BiometricManager A class that contains biometric utilities. 
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. 
BlendModeColorFilterCompat Helper for accessing ColorFilter APIs on various API levels of the platform  
BlendModeCompat Compat version of BlendMode, usages of BlendModeCompat will map to PorterDuff.Mode wherever possible  
BokehImageCaptureExtender Loads the OEM extension implementation for bokeh effect type. 
BokehPreviewExtender Load the OEM extension Preview implementation for bokeh effect type. 
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 This class is deprecated. Browser Actions are deprecated as of release 1.2.0.  
BrowserActionsIntent This class is deprecated. Browser Actions are deprecated as of release 1.2.0.  
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 useful for adapting interfaces that take callbacks into interfaces that return ListenableFuture. 
CallbackToFutureAdapter.Completer<T> Used to complete the future returned by CallbackToFutureAdapter.getFuture(CallbackToFutureAdapter.Resolver)  
CallbackToFutureAdapter.Resolver<T> This interface should be implemented by the object passed into CallbackToFutureAdapter.getFuture(Resolver). 
CallSuper Denotes that any overriding methods should invoke this method as well. 
Camera2Config Configuration options related to the android.hardware.camera2 APIs. 
Camera2Config.Extender Extends a Config.ExtendableBuilder to add Camera2 options. 
CameraControl An interface for controlling camera's zoom, focus and metering across all use cases. 
CameraInfoUnavailableException An exception thrown when unable to retrieve information about a camera. 
CameraView A View that displays a preview of the camera with methods takePicture(OnImageCapturedListener), takePicture(File, OnImageSavedListener), startRecording(File, OnVideoSavedListener) and stopRecording(). 
CameraView.CaptureMode The capture mode used by CameraView. 
CameraView.ScaleType Options for scaling the bounds of the view finder to the bounds of this view. 
CameraX Main interface for accessing CameraX library. 
CameraX.ErrorCode The types of error states that can occur. 
CameraX.ErrorListener Listener called whenever an error condition occurs within CameraX. 
CameraX.LensFacing The direction the camera faces relative to device screen. 
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. 
CompositePageTransformer Allows for combining multiple ViewPager2.PageTransformer objects. 
CompoundButtonCompat Helper for accessing CompoundButton. 
Config A Configuration is a collection of options and values. 
Config.ExtendableBuilder Extendable builders are used to add externally defined options to a configuration. 
Configuration The Configuration object used to customize WorkManager upon initialization. 
Configuration.Builder A Builder for Configurations. 
Configuration.Provider A class that can provide the Configuration for WorkManager and allow for on-demand initialization of WorkManager. 
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. 
CustomTabColorSchemeParams Contains visual parameters of a Custom Tab that may depend on the color scheme. 
CustomTabColorSchemeParams.Builder Builder class for CustomTabColorSchemeParams objects. 
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. 
DelegatingWorkerFactory A WorkerFactory which delegates to other factories. 
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. 
DialogFragmentNavigator Navigator that uses DialogFragment.show(FragmentManager, String). 
DialogFragmentNavigator.Destination NavDestination specific to DialogFragmentNavigator. 
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. 
DisplayOrientedMeteringPointFactory A MeteringPointFactory that can create MeteringPoint by display oriented x, y. 
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 Marks a field of an Entity or POJO to allow 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 in a Single<T> DAO method needs to return a result but the returned result from the database is empty. 
EncryptedFile Class used to create and read encrypted files. 
EncryptedFile.Builder Builder class to configure EncryptedFile  
EncryptedFile.FileEncryptionScheme The encryption scheme to encrypt files. 
EncryptedSharedPreferences An implementation of SharedPreferences that encrypts keys and values. 
EncryptedSharedPreferences.PrefKeyEncryptionScheme The encryption scheme to encrypt keys. 
EncryptedSharedPreferences.PrefValueEncryptionScheme The encryption scheme to encrypt values. 
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. 
Experimental Denotes that the annotated element is a marker of an experimental API. 
Experimental.Level Severity of the diagnostic that should be reported on usages of experimental API which did not explicitly accept the experimental aspect of that API either by using UseExperimental or by being annotated with the corresponding marker annotation. 
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. 
ExtensionCameraIdFilter Filter camera id by extender implementation. 
ExtensionsErrorListener Listener called when any extensions error occurs. 
ExtensionsErrorListener.ExtensionsErrorCode Types of error when extensions function is enabled. 
ExtensionsManager Provides interfaces for third party app developers to get capabilities info of extension functions. 
ExtensionsManager.EffectMode The effect mode options applied on the bound use cases  
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 item view 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. 
FakeKeyedAppStatesReporter A fake KeyedAppStatesReporter for testing. 
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. 
FlashMode The flash mode options when taking a picture using ImageCapture. 
FlingAnimation

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

FloatingWindow A marker interface for NavDestination subclasses that float above the view of other destinations (i.e. 
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. 
FocusMeteringAction A configuration used to trigger a focus and/or metering action. 
FocusMeteringAction.Builder The builder used to create the FocusMeteringAction. 
FocusMeteringAction.MeteringMode Focus/Metering mode used to specify which 3A regions is activated for corresponding MeteringPoint. 
FocusMeteringAction.OnAutoFocusListener Listener for receiving auto-focus completion event. 
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. 
FragmentContainer Callbacks to a Fragment's container. 
FragmentContainerView FragmentContainerView is a customized Layout designed specifically for Fragments. 
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. 
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. 
FragmentTabHost This class is deprecated. Use TabLayout and ViewPager 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. 
HasDefaultViewModelProviderFactory Interface that marks a ViewModelStoreOwner as having a default ViewModelProvider.Factory for use with ViewModelProvider.ViewModelProvider(ViewModelStoreOwner). 
HdrImageCaptureExtender Load the OEM extension implementation for HDR effect type. 
HdrPreviewExtender Load the OEM extension Preview implementation for HDR effect type. 
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. 
HintConstants Contains all the officially supported autofill hint constants. 
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. 
ImageAnalysis A use case providing CPU accessible images for an app to perform image analysis on. 
ImageAnalysis.Analyzer Interface for analyzing images. 
ImageAnalysis.ImageReaderMode The different ways that the image sent to the analyzer is acquired from the underlying ImageReader. 
ImageAnalysisConfig Configuration for an image analysis use case. 
ImageAnalysisConfig.Builder Builder for a ImageAnalysisConfig. 
ImageCapture A use case for taking a picture. 
ImageCapture.CaptureMode Capture mode options for ImageCapture. 
ImageCapture.ImageCaptureError Describes the error that occurred during an image capture operation (such as ImageCapture.takePicture(OnImageCapturedListener)). 
ImageCapture.Metadata Holder class for metadata that will be saved with captured images. 
ImageCapture.OnImageCapturedListener Listener called when an image capture has completed. 
ImageCapture.OnImageSavedListener Listener containing callbacks for image file I/O events. 
ImageCaptureConfig Configuration for an image capture use case. 
ImageCaptureConfig.Builder Builder for a ImageCaptureConfig. 
ImageCaptureExtender Class for using an OEM provided extension on image capture. 
ImageCardView A subclass of BaseCardView with an ImageView as its main region. 
ImageInfo Metadata for an image. 
ImageProxy An image proxy which has an analogous interface as Image. 
ImageProxy.PlaneProxy A plane proxy which has an analogous interface as Image.Plane. 
ImageProxyBundle A set of ImageProxy which are mapped an identifier. 
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. 
InputMergerFactory A factory object that creates InputMerger instances. 
Insert Marks a method in a Dao annotated class as an insert method. 
Insets An Insets instance holds four integer offsets which describe changes to the four edges of a Rectangle. 
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. 
Junction Declares a junction to be used for joining a relationship. 

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. 

LibraryResult Result class to be used with ListenableFuture for asynchronous calls between MediaLibraryService.MediaLibrarySession and MediaBrowser. 
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. 
MarginPageTransformer Adds space between pages via the ViewPager2.PageTransformer API. 
MasterKeys Convenient methods to create and obtain master keys in Android Keystore. 
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.Builder Builder for MediaBrowser. 
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.Builder Builder for MediaController. 
MediaController.ControllerCallback Interface for listening to change in activeness of the MediaSession. 
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.  
MediaControlView A View that contains the controls for MediaController or SessionPlayer. 
MediaControlView.OnFullScreenListener Interface definition of a callback to be invoked to inform the fullscreen mode is changed. 
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.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.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. 
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. 
MeteringPoint A MeteringPoint used to specify a region in sensor coordinates for focusing and metering Purpose. 
MeteringPointFactory A Factory to create a MeteringPoint. 
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  
MutableConfig MutableConfig is a Config that can be modified. 
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. 
NavBackStackEntry Representation of an entry in the back stack of a NavController. 
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. 
NavHostController Subclass of NavController that offers additional APIs for use by a NavHost to connect the NavController to external dependencies. 
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. 
NightImageCaptureExtender Load the OEM extension implementation for night effect type. 
NightPreviewExtender Load the OEM extension Preview implementation for night effect type. 
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.BubbleMetadata Encapsulates the information needed to display a notification as a bubble. 
NotificationCompat.BubbleMetadata.Builder Builder to construct a NotificationCompat.BubbleMetadata object. 
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. 
Observable<T> An observable stream which contains data or errors. 
Observable.Observer<T> A callback that can receive new values and errors from an Observable. 
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 Class 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. 
OnBackPressedDispatcherOwner A class that has an OnBackPressedDispatcher that allows you to register a OnBackPressedCallback for handling the system back button. 
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  
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