How to restore database from backup agent saved path android

I am using this code for saving database, using BackupAgent class

public class MyBackupAgent extends BackupAgentHelper {

String DATABASE_NAME = "mydb";
String DATABASE_FILE_NAME = "mydb.db";
@Override
public void onCreate() {
    SharedPreferencesBackupHelper helper = new SharedPreferencesBackupHelper(this, PREFS);
    addHelper(PREFS_BACKUP_KEY, helper);

    FileBackupHelper dbs = new FileBackupHelper(this, DATABASE_FILE_NAME);
    addHelper("dbs", dbs);
}

@Override
public File getFilesDir() {
    File path = getDatabasePath(DATABASE_FILE_NAME);
    return path.getParentFile();
}

}

Now after that i want to know how to restore database? Please help me about this, Thanks in advance