Concrete implementation of BackupAgentHelper using FileBackupHelper to backup a single file

CordovaBackupAgentHelper.java

public class CordovaBackupAgentHelper extends BackupAgentHelper {
    static final String FILE_NAME = "gameData.json";
    static final String FILES_BACKUP_KEY = "data_file";

    @Override
    public void onCreate() {
        FileBackupHelper helper = new FileBackupHelper(this, FILE_NAME);
        addHelper(FILES_BACKUP_KEY, helper);
    }

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

        Log.d(Backup.LOG_TAG, "Backup requested: " + oldState.toString() + " | "  + newState.toString());

        synchronized (Backup.sDataLock) {
            Log.d(Backup.LOG_TAG, "Backup requested: " + data.toString());
            super.onBackup(oldState, data, newState);
        }
    }

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

        synchronized (Backup.sDataLock) {
            Log.d(Backup.LOG_TAG, "Restore given: " + data.toString());
            super.onRestore(data, appVersionCode, newState);
        }
    }
}