Contains the backup and restore functionality available to applications. If a user wipes the data on their device or upgrades to a new Android-powered device, all applications that have enabled backup can restore the user's previous data when the application is reinstalled.
For more information, see the Data Backup guide.
All backup and restore operations are controlled by the BackupManager. Each application that would
like to enable backup and preserve its data on remote strage must implement a
backup agent. A backup agent can be built by extending either BackupAgent
or BackupAgentHelper. The BackupAgentHelper class provides a wrapper around BackupAgent that simplifies the procedures to implement a backup agent by
employing backup helpers such as SharedPreferencesBackupHelper and
FileBackupHelper.
The backup APIs let applications:
SharedPreferences and files| BackupHelper | Defines the calling interface that BackupAgentHelper uses
when dispatching backup and restore operations to the installed helpers. |
| BackupAgent | Provides the central interface between an application and Android's data backup infrastructure. |
| BackupAgentHelper | A convenient BackupAgent wrapper class that automatically manages
heterogeneous data sets within the backup data, each identified by a unique
key prefix. |
| BackupDataInput | Provides the structured interface through which a BackupAgent reads
information from the backup data set, via its
onRestore()
method. |
| BackupDataInputStream | Provides an InputStream-like interface for accessing an
entity's data during a restore operation. |
| BackupDataOutput | Provides the structured interface through which a BackupAgent commits
information to the backup data set, via its onBackup() method. |
| BackupManager | The interface through which an application interacts with the Android backup service to request backup and restore operations. |
| FileBackupHelper | A helper class that can be used in conjunction with
BackupAgentHelper to manage the backup of a set of
files. |
| FullBackupDataOutput | Provides the interface through which a BackupAgent writes entire files
to a full backup data set, via its onFullBackup(FullBackupDataOutput)
method. |
| RestoreObserver | Callback class for receiving progress reports during a restore operation. |
| SharedPreferencesBackupHelper | A helper class that can be used in conjunction with
BackupAgentHelper to manage the backup of
SharedPreferences. |