Question

在我的Android应用中，我有一个接收触摸事件的自定义View。但是，每次触摸它时它都没有反应 - 只是有时候。据我所知，如果我触摸屏幕，移动我的手指，然后松开 - 即使我只移动一点 - 事件被拾取，但如果我太快地点击屏幕让我的手指滑过它，什么都没发生。我该如何解决这个问题？

以下是View的代码：

public class SpeedShooterGameView extends GameActivity.GameView {
    public SpeedShooterGameView(Context arg0, AttributeSet arg1) {
        super(arg0, arg1);
    }

    @Override
    protected GameThread getNewThread(SurfaceHolder holder, Context context) {
        return new SpeedShooterGameThread(holder, context);
    }

    // Program is driven by screen touches
    public boolean onTouchEvent(MotionEvent event) {
        SpeedShooterGameThread thread = (SpeedShooterGameThread) getThread();
        if (thread.isRunning()) {
            return thread.recieveTouch(event);
        } else {
             return false;
        }
    }
}

我非常确信行SpeedShooterGameThread thread = (SpeedShooterGameThread) getThread();中返回的对象正如我所期望的那样工作，但如果上面的代码看起来很好，我也会发布该类的相关代码。调用thread.recieveTouch(event);时，MotionEvent将被发送到另一个线程。

编辑：我会继续发布SpeedShooterGameThread的代码：

public class SpeedShooterGameThread extends GameActivity.GameView.GameThread {
    //... snip ...
    private Queue<MotionEvent> touchEventQueue;

    //... snip ...

    public synchronized final void newGame() { //called from the constructor, used to go to a known stable state
        //... snip ...
        touchEventQueue = new LinkedList<MotionEvent>();
        //... snip ...
    }

    //...snip...

    public synchronized boolean recieveTouch(MotionEvent event) {
        return touchEventQueue.offer(event);
    }

    private synchronized void processTouchEvents() {
        synchronized (touchEventQueue) {
            while (!touchEventQueue.isEmpty()) {
                MotionEvent event = touchEventQueue.poll();
                if (event == null) {
                    continue;
                }
                //... snip ....
            }
        }
    }

    //... snip ...
}

Answer 1

我通过完全取消Queue<MotionEvent>来修复错误。我的代码现在看起来像这样：

线程不再使用Queue，并且在调用MotionEvents时会立即处理recieveTouch()：

public class SpeedShooterGameThread extends GameActivity.GameView.GameThread {
//The touchEvent member has been removed.

//... snip ...

    public synchronized final void newGame() { //called from the constructor, used to go to a known stable state
        // touchEvents is no longer initialized.

        //...snip...
    }

    //...snip...

    public synchronized boolean recieveTouch(MotionEvent event) {
        //Immediately handle the MotionEvent here,
        //or return false if the event isn't processed
    }

    // The processTouchEvents() method is removed.

    //... snip ...
}

视图未更改：

public class SpeedShooterGameView extends GameActivity.GameView {
    public SpeedShooterGameView(Context arg0, AttributeSet arg1) {
        super(arg0, arg1);
    }

    @Override
    protected GameThread getNewThread(SurfaceHolder holder, Context context) {
        return new SpeedShooterGameThread(holder, context);
    }

    // Program is driven by screen touches
    public boolean onTouchEvent(MotionEvent event) {
        SpeedShooterGameThread thread = (SpeedShooterGameThread) getThread();
        if (thread.isRunning()) {
            return thread.recieveTouch(event);
        } else {
             return false;
        }
    }
}

并非所有Android视图都会收到触摸事件

1 个答案: