BackupAgent.OnRestore Method

Definition

Namespace:

Android.App.Backup

Assembly:

Mono.Android.dll

Overloads

OnRestore(BackupDataInput, Int32, ParcelFileDescriptor)	The application is being restored from backup and should replace any existing data with the contents of the backup.
OnRestore(BackupDataInput, Int64, ParcelFileDescriptor)	New version of #onRestore(BackupDataInput, int, android.os.ParcelFileDescriptor) that handles a long app version code.

OnRestore(BackupDataInput, Int32, ParcelFileDescriptor)

The application is being restored from backup and should replace any existing data with the contents of the backup.

[Android.Runtime.Register("onRestore", "(Landroid/app/backup/BackupDataInput;ILandroid/os/ParcelFileDescriptor;)V", "GetOnRestore_Landroid_app_backup_BackupDataInput_ILandroid_os_ParcelFileDescriptor_Handler")]
public abstract void OnRestore (Android.App.Backup.BackupDataInput? data, int appVersionCode, Android.OS.ParcelFileDescriptor? newState);

[<Android.Runtime.Register("onRestore", "(Landroid/app/backup/BackupDataInput;ILandroid/os/ParcelFileDescriptor;)V", "GetOnRestore_Landroid_app_backup_BackupDataInput_ILandroid_os_ParcelFileDescriptor_Handler")>]
abstract member OnRestore : Android.App.Backup.BackupDataInput * int * Android.OS.ParcelFileDescriptor -> unit

Parameters

data

BackupDataInput

A structured wrapper around an open, read-only file descriptor pointing to a full snapshot of the application's data. The application should consume every entity represented in this data stream.

appVersionCode

Int32

The value of the android:versionCodehttps://developer.android.com/guide/topics/manifest/manifest-element.html#vcode manifest attribute, from the application that backed up this particular data set. This makes it possible for an application's agent to distinguish among any possible older data versions when asked to perform the restore operation.

newState

ParcelFileDescriptor

An open, read/write ParcelFileDescriptor pointing to an empty file. The application should record the final backup state here after restoring its data from the data stream. When a full-backup dataset is being restored, this will be null.

Attributes

RegisterAttribute

Exceptions

IOException

Remarks

The application is being restored from backup and should replace any existing data with the contents of the backup. The backup data is provided through the data parameter. Once the restore is finished, the application should write a representation of the final state to the newState file descriptor.

The application is responsible for properly erasing its old data and replacing it with the data supplied to this method. No "clear user data" operation will be performed automatically by the operating system. The exception to this is in the case of a failed restore attempt: if onRestore() throws an exception, the OS will assume that the application's data may now be in an incoherent state, and will clear it before proceeding.

Java documentation for android.app.backup.BackupAgent.onRestore(android.app.backup.BackupDataInput, int, android.os.ParcelFileDescriptor).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

OnRestore(BackupDataInput, Int64, ParcelFileDescriptor)

New version of #onRestore(BackupDataInput, int, android.os.ParcelFileDescriptor) that handles a long app version code.

[Android.Runtime.Register("onRestore", "(Landroid/app/backup/BackupDataInput;JLandroid/os/ParcelFileDescriptor;)V", "GetOnRestore_Landroid_app_backup_BackupDataInput_JLandroid_os_ParcelFileDescriptor_Handler", ApiSince=28)]
public virtual void OnRestore (Android.App.Backup.BackupDataInput? data, long appVersionCode, Android.OS.ParcelFileDescriptor? newState);

[<Android.Runtime.Register("onRestore", "(Landroid/app/backup/BackupDataInput;JLandroid/os/ParcelFileDescriptor;)V", "GetOnRestore_Landroid_app_backup_BackupDataInput_JLandroid_os_ParcelFileDescriptor_Handler", ApiSince=28)>]
abstract member OnRestore : Android.App.Backup.BackupDataInput * int64 * Android.OS.ParcelFileDescriptor -> unit
override this.OnRestore : Android.App.Backup.BackupDataInput * int64 * Android.OS.ParcelFileDescriptor -> unit

Parameters

data

BackupDataInput

A structured wrapper around an open, read-only file descriptor pointing to a full snapshot of the application's data. The application should consume every entity represented in this data stream.

appVersionCode

Int64

The value of the <a href="[TODO: @docRoot]guide/topics/manifest/manifest-element.html#vcode">android:versionCode</a> manifest attribute, from the application that backed up this particular data set. This makes it possible for an application's agent to distinguish among any possible older data versions when asked to perform the restore operation.

newState

ParcelFileDescriptor

An open, read/write ParcelFileDescriptor pointing to an empty file. The application should record the final backup state here after restoring its data from the <code>data</code> stream. When a full-backup dataset is being restored, this will be <code>null</code>.

Attributes

RegisterAttribute

Remarks

New version of #onRestore(BackupDataInput, int, android.os.ParcelFileDescriptor) that handles a long app version code. Default implementation casts the version code to an int and calls #onRestore(BackupDataInput, int, android.os.ParcelFileDescriptor).

Java documentation for android.app.backup.BackupAgent.onRestore(android.app.backup.BackupDataInput, long, android.os.ParcelFileDescriptor).

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.