如何保存SurfaceView的状态？

Question

如果每次按下home按钮然后返回活动时重新创建它，则与其关联的线程也将被重新创建。这意味着游戏循环将从头开始，因此当用户返回活动时，就像他们刚刚打开活动一样。

public class GameView extends SurfaceView implements SurfaceHolder.Callback{
    protected GameThread gameThread; 
    public GameThread(Context context){
        gameThread = new GameThread(this);
        //the rest of the constructor
    }
    //gameview's stuff
}

  //and in the thread...

public class GameThread extends Thread{
    protected GameView gameView; 

    public GameThread(GameView gameView){this.gameView=gameView}
    //gameview's stuff
}

在活动中创建：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(new GameView(this));