BackupHelper
interface BackupHelper
android.app.backup.BackupHelper |
Defines the calling interface that BackupAgentHelper
uses when dispatching backup and restore operations to the installed helpers. Applications can define and install their own helpers as well as using those provided as part of the Android framework.
Although multiple helper objects may be installed simultaneously, each helper is responsible only for handling its own data, and will not see entities created by other components within the backup system. Invocations of multiple helpers are performed sequentially by the BackupAgentHelper
, with each helper given a chance to access its own saved state from within the state record produced during the previous backup operation.
Summary
Public methods | |
---|---|
abstract Unit |
performBackup(oldState: ParcelFileDescriptor!, data: BackupDataOutput!, newState: ParcelFileDescriptor!) Based on |
abstract Unit |
restoreEntity(data: BackupDataInputStream!) Called by |
abstract Unit |
writeNewStateDescription(newState: ParcelFileDescriptor!) Called by |
Public methods
performBackup
abstract fun performBackup(
oldState: ParcelFileDescriptor!,
data: BackupDataOutput!,
newState: ParcelFileDescriptor!
): Unit
Based on oldState
, determine what application content needs to be backed up, write it to data
, and fill in newState
with the complete state as it exists now.
Implementing this method is much like implementing onBackup()
— the method parameters are the same. When this method is invoked the oldState
descriptor points to the beginning of the state data written during this helper's previous backup operation, and the newState
descriptor points to the file location at which the helper should write its new state after performing the backup operation.
Note: The helper should not close or seek either the oldState
or the newState
file descriptors. It is essential that when reading the helper's saved state from the oldState
file, no extra content is consumed beyond what was stored by this helper. If more old state data is read, even accidentally, it will make it impossible for additional helpers that may be invoked after this one to properly reconstruct their prior state.
Parameters | |
---|---|
oldState |
ParcelFileDescriptor!: An open, read-only android.os.ParcelFileDescriptor pointing to the last backup state provided by the application. May be null , in which case no prior state is being provided and the application should perform a full backup. |
data |
BackupDataOutput!: An open, read/write BackupDataOutput pointing to the backup data destination. Typically the application will use backup helper classes to write to this file. |
newState |
ParcelFileDescriptor!: An open, read/write android.os.ParcelFileDescriptor pointing to an empty file. The application should record the final backup state here after writing the requested data to the data output stream. |
restoreEntity
abstract fun restoreEntity(data: BackupDataInputStream!): Unit
Called by BackupAgentHelper
to restore a single entity from the restore data set. This method will be called for each entity in the data set that belongs to this handler.
Note: Do not close the data
stream. Do not read more than size()
bytes from data
.
Parameters | |
---|---|
data |
BackupDataInputStream!: An open BackupDataInputStream from which the backup data can be read. |
writeNewStateDescription
abstract fun writeNewStateDescription(newState: ParcelFileDescriptor!): Unit
Called by BackupAgentHelper
after a restore operation to write the backup state file corresponding to the data as processed by the helper. The data written here will be available to the helper during the next call to its performBackup()
method.
This method will be called even if the handler's restoreEntity()
method was never invoked during the restore operation.
Note: The helper should not close or seek the newState
file descriptor.
Parameters | |
---|---|
newState |
ParcelFileDescriptor!: A android.os.ParcelFileDescriptor to which the new state will be written. |