Auto Backup

AndroidManifest.xml

    <application
        android:allowBackup="true"
        android:fullBackupContent="@xml/mybackupscheme"
        .......
        android:backupAgent=".MyBackupAgent"
        >
        .......
    </application>

MyBackupAgent.java

public class MyBackupAgent extends BackupAgent {
    @Override
    public void onRestoreFinished() {
        super.onRestoreFinished();
        Log.d("jollydroid", "onRestoreFinished");
    }

    @Override
    public void onBackup(ParcelFileDescriptor oldState, BackupDataOutput data,
                         ParcelFileDescriptor newState) throws IOException {}

    @Override
    public void onRestore(BackupDataInput data, int appVersionCode, ParcelFileDescriptor newState) throws IOException {}

}

mybackupscheme.xml

<?xml version="1.0" encoding="utf-8"?>
<full-backup-content>
    <include
        domain="sharedpref"
        path="pref1.xml"/>
</full-backup-content>