StorageVolume

EXTRA_STORAGE_VOLUME

public static final String EXTRA_STORAGE_VOLUME

Name of the Parcelable extra in the Intent#ACTION_MEDIA_REMOVED, Intent#ACTION_MEDIA_UNMOUNTED, Intent#ACTION_MEDIA_CHECKING, Intent#ACTION_MEDIA_NOFS, Intent#ACTION_MEDIA_MOUNTED, Intent#ACTION_MEDIA_SHARED, Intent#ACTION_MEDIA_BAD_REMOVAL, Intent#ACTION_MEDIA_UNMOUNTABLE, and Intent#ACTION_MEDIA_EJECT broadcast that contains a StorageVolume.

Constant Value: "android.os.storage.extra.STORAGE_VOLUME"

CREATOR

public static final Creator<StorageVolume> CREATOR

createAccessIntent

public Intent createAccessIntent (String directoryName)

This method was deprecated in API level 29.
Callers should migrate to using Intent#ACTION_OPEN_DOCUMENT_TREE instead. Launching this Intent on devices running Build.VERSION_CODES.Q or higher, will immediately finish with a result code of Activity.RESULT_CANCELED.

Builds an intent to give access to a standard storage directory or entire volume after obtaining the user's approval.

When invoked, the system will ask the user to grant access to the requested directory (and its descendants). The result of the request will be returned to the activity through the onActivityResult method.

To gain access to descendants (child, grandchild, etc) documents, use DocumentsContract#buildDocumentUriUsingTree(Uri, String), or DocumentsContract#buildChildDocumentsUriUsingTree(Uri, String) with the returned URI.

If your application only needs to store internal data, consider using Context#getExternalFilesDirs(String), Context#getExternalCacheDirs(), or Context#getExternalMediaDirs(), which require no permissions to read or write.

Access to the entire volume is only available for non-primary volumes (for the primary volume, apps can use the Manifest.permission.READ_EXTERNAL_STORAGE and Manifest.permission.WRITE_EXTERNAL_STORAGE permissions) and should be used with caution, since users are more likely to deny access when asked for entire volume access rather than specific directories.

createOpenDocumentTreeIntent

public Intent createOpenDocumentTreeIntent ()

Builds an Intent#ACTION_OPEN_DOCUMENT_TREE to allow the user to grant access to any directory subtree (or entire volume) from the DocumentsProviders available on the device. The initial location of the document navigation will be the root of this StorageVolume. Note that the returned Intent simply suggests that the user picks this StorageVolume by default, but the user may select a different location. Callers must respect the user's chosen location, even if it is different from the originally requested location.

describeContents

public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(android.os.Parcel, int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

equals

public boolean equals (Object obj)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
• For any non-null reference value x, x.equals(null) should return false.

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

getDescription

public String getDescription (Context context)

Returns a user-visible description of the volume.

getDirectory

public File getDirectory ()

Returns the directory where this volume is currently mounted.

Direct filesystem access via this path has significant emulation overhead, and apps are instead strongly encouraged to interact with media on storage volumes via the MediaStore APIs.

This directory does not give apps any additional access beyond what they already have via MediaStore.

getMediaStoreVolumeName

public String getMediaStoreVolumeName ()

Return the volume name that can be used to interact with this storage device through MediaStore.

getState

public String getState ()

Returns the current state of the volume.

getUuid

public String getUuid ()

Gets the volume UUID, if any.

hashCode

public int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
• If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals(java.lang.Object) method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

isEmulated

public boolean isEmulated ()

Returns true if the volume is emulated.

isPrimary

public boolean isPrimary ()

Returns true if the volume is the primary shared/external storage, which is the volume backed by Environment#getExternalStorageDirectory().

isRemovable

public boolean isRemovable ()

Returns true if the volume is removable.

toString

public String toString ()

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

writeToParcel

public void writeToParcel (Parcel parcel, 
                int flags)

Flatten this object in to a Parcel.