A helper class that can be used in conjunction with BackupAgentHelper to manage the backup of SharedPreferences. Whenever a backup is performed, it will back up all named shared preferences that have changed since the last backup operation. To use this class, the application's backup agent class should extend BackupAgentHelper. Then, in the agent's BackupAgent.
For example, an agent supporting backup and restore for an application with two groups of SharedPreferences data might look something like this: Construct a helper for backing up and restoring the SharedPreferences under the given names. Backs up the configured SharedPreferences groups.
Called by BackupAgentHelper after a restore operation to write the backup state file corresponding the data as processed by the helper. Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. Causes the current thread to wait until another thread invokes the notify method or the notifyAll method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
Causes the current thread to wait until either another thread invokes the notify method or the notifyAll method for this object, or a specified amount of time has elapsed. Causes the current thread to wait until another thread invokes the notify method or the notifyAll method for this object. Based on oldStatedetermine what application content needs to be backed up, write it to dataand fill in newState with the complete state as it exists now.
Called by BackupAgentHelper to restore a single entity from the restore data set. 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.
The helper should not close or seek the newState file descriptor. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup. The finalize method may take any action, including making this object available "Flera hors om misstankt mord" to other threads; the usual purpose of finalizehowever, is to perform cleanup actions before the object is irrevocably discarded.
The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition. The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored finalization of that object terminates.
After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded. The finalize method is never invoked more than once by a Java virtual machine for any given object. Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.
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Last updated June 6, Protected methods void finalize Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. Inherited methods From class java.
Object Object clone Creates and returns a copy of this object. String toString Returns a string representation of the object. The names of each SharedPreferences file to back up.
An open, read-only ParcelFileDescriptor pointing to the last backup state provided by the application. May be nullin which case no prior state is being provided and the application should perform a full backup. Typically the application will use backup helper classes to write to this file. The application should record the final backup state here after writing the requested data to the data output stream. An open BackupDataInputStream from which the backup data can be read. A ParcelFileDescriptor to which the new state will be written.
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