| java.lang.Object | |
| ↳ | android.app.backup.BackupManager |
The interface through which an application interacts with the Android backup service to request backup and restore operations. Applications instantiate it using the constructor and issue calls through that instance.
When an application has made changes to data which should be backed up, a
call to dataChanged() will notify the backup service. The system
will then schedule a backup operation to occur in the near future. Repeated
calls to dataChanged() have no further effect until the backup
operation actually occurs.
A backup or restore operation for your application begins when the system launches the
BackupAgent subclass you've declared in your manifest. See the
documentation for BackupAgent for a detailed description
of how the operation then proceeds.
Several attributes affecting the operation of the backup and restore mechanism
can be set on the
<application>
tag in your application's AndroidManifest.xml file.
For more information about using BackupManager, read the Data Backup developer guide.
| XML Attributes | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| android:allowBackup | Whether to allow the application to participate in the backup and restore infrastructure. | ||||||||||
| android:backupAgent | The name of the class subclassing BackupAgent to manage
backup and restore of the application's data on external storage. |
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| android:killAfterRestore | Whether the application in question should be terminated after its settings have been restored during a full-system restore operation. | ||||||||||
| android:restoreAnyVersion | Indicate that the application is prepared to attempt a restore of any backed-up dataset, even if the backup is apparently from a newer version of the application than is currently installed on the device. | ||||||||||
| Public Constructors | |||||||||||
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Constructs a BackupManager object through which the application can
communicate with the Android backup system.
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| Public Methods | |||||||||||
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Notifies the Android backup system that your application wishes to back up
new changes to its data.
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Convenience method for callers who need to indicate that some other package
needs a backup pass.
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Restore the calling application from backup.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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Whether to allow the application to participate in the backup
and restore infrastructure. If this attribute is set to false,
no backup or restore of the application will ever be performed, even by a
full-system backup that would otherwise cause all application data to be saved
via adb. The default value of this attribute is true.
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form
"@[package:]type:name") or
theme attribute (in the form
"?[package:][type:]name")
containing a value of this type.
This corresponds to the global attribute resource symbol allowBackup.
The name of the class subclassing BackupAgent to manage
backup and restore of the application's data on external storage.
Must be a string value, using '\\;' to escape characters such as '\\n' or '\\uxxxx' for a unicode character.
This may also be a reference to a resource (in the form
"@[package:]type:name") or
theme attribute (in the form
"?[package:][type:]name")
containing a value of this type.
This corresponds to the global attribute resource symbol backupAgent.
Whether the application in question should be terminated after its settings have been restored during a full-system restore operation. Single-package restore operations will never cause the application to be shut down. Full-system restore operations typically only occur once, when the phone is first set up. Third-party applications will not usually need to use this attribute.
The default is true, which means that after the application
has finished processing its data during a full-system restore, it will be
terminated.
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form
"@[package:]type:name") or
theme attribute (in the form
"?[package:][type:]name")
containing a value of this type.
This corresponds to the global attribute resource symbol killAfterRestore.
Indicate that the application is prepared to attempt a restore of any
backed-up dataset, even if the backup is apparently from a newer version
of the application than is currently installed on the device. Setting
this attribute to true will permit the Backup Manager to
attempt restore even when a version mismatch suggests that the data are
incompatible. Use with caution!
The default value of this attribute is false.
Must be a boolean value, either "true" or "false".
This may also be a reference to a resource (in the form
"@[package:]type:name") or
theme attribute (in the form
"?[package:][type:]name")
containing a value of this type.
This corresponds to the global attribute resource symbol restoreAnyVersion.
Constructs a BackupManager object through which the application can communicate with the Android backup system.
| context | The Context that was provided when
one of your application's Activities
was created.
|
|---|
Notifies the Android backup system that your application wishes to back up
new changes to its data. A backup operation using your application's
BackupAgent subclass will be scheduled when you
call this method.
Convenience method for callers who need to indicate that some other package needs a backup pass. This can be useful in the case of groups of packages that share a uid.
This method requires that the application hold the "android.permission.BACKUP" permission if the package named in the argument does not run under the same uid as the caller.
| packageName | The package name identifying the application to back up. |
|---|
Restore the calling application from backup. The data will be restored from the current backup dataset if the application has stored data there, or from the dataset used during the last full device setup operation if the current backup dataset has no matching data. If no backup data exists for this application in either source, a nonzero value will be returned.
If this method returns zero (meaning success), the OS will attempt to retrieve
a backed-up dataset from the remote transport, instantiate the application's
backup agent, and pass the dataset to the agent's
onRestore()
method.
| observer | The RestoreObserver to receive callbacks during the restore
operation. This must not be null. |
|---|