当按下主页按钮时暂停游戏线程,重新进入恢复游戏线程

时间:2014-02-25 16:14:43

标签: android multitasking onresume

我遇到了问题

点击主页按钮时,我的游戏线程类暂停了。但是当重新进入应用程序并且onResume()方法被调用时,它应该恢复游戏线程......我得到的就是力量关闭。

这是我的MainActivity:

public class MainActivity extends Activity {

private RelativeLayout relativeLayout;
private GameView gameView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    gameView = new GameView(this, this);
    setContentView(R.layout.activity_main);
    relativeLayout = (RelativeLayout)findViewById(R.id.mainView);
    relativeLayout.addView(gameView);
}

@Override
protected void onPause() {
    super.onPause();
    gameView.pause();
}

@Override
protected void onResume() {
    super.onResume();
    if(gameView.getGameThread() != null) {
        if(gameView.getGameThread().isRunning == false) {
            gameView.resume();
        }
    }
}
}

gameView是关注类,一个由GameThread渲染的surfaceView:

public class GameView extends SurfaceView{

private GameThread gameThread;

public GameView(Context context, Activity activity) {
    super(context);

    gameThread = new GameThread(this);
    holder = getHolder();
    holder.addCallback(new SurfaceHolder.Callback() {

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {

        }

        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            gameThread.setRunning(true);
            gameThread.start();

        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width,
                int height) {

        }
    });
}

public GameThread getGameThread() {
    return gameThread;
}


public void update() {

}


public void pause() {
    gameThread.pause();
}

public void resume() {
    gameThread.resumeThread();
}
}

这是GameThread类:

public class GameThread extends Thread{

private GameView view;
public boolean isRunning = false;

public GameThread(GameView view) {
    this.view = view;
}

public void setRunning(boolean setRunning) {
    isRunning = setRunning;
}

public void stopThread() {
    isRunning = false;
}

public void run() {
    while(isRunning) {
        Canvas c = null;
        view.update();
        try {
            c = view.getHolder().lockCanvas();
            synchronized (view.getHolder()) {
                view.draw(c);
            }
        }finally {
            if(c != null) {
                view.getHolder().unlockCanvasAndPost(c);
            }
        }
    }
}

public void startThread() {
    isRunning = true;
}

public void pause() {
    isRunning = false;
}

public void resumeThread() {
    isRunning = true;
}
}

我删除了代码中不相关的部分。

当重新进入应用程序时,android.view.Choreographer类打开

有什么想法吗?

1 个答案:

答案 0 :(得分:1)

实际上你并没有暂停你的线程(严格来说,没有暂停线程的事情)。你结束了你的主题。

当您调用pause()时,将isRunning标志设置为false,这会使线程退出循环并且线程结束。当你再次将'isRunning'设置为true时,线程将不会重新启动。

实际上你不能在java中重用线程,你必须创建一个新线程,因为一旦线程循环结束,它就死了。