我正在创建一个应用程序,其中在运行时给定的两点之间生成一条线。
我看到的问题是,每次在模拟器上单击onTouch()都会调用两次。我知道检查了两个操作(ACTION_DOWNACTION_UP)。但是我希望我的应用仅调用一次onTouch()。请给我一些想法。这是我使用的代码:

SurfaceView surfaceview = new SurfaceView(getContext());
SurfaceHolder h = surfaceview.getHolder();
int action = event.getActionMasked();
synchronized(h) {
    if (action == MotionEvent.ACTION_DOWN && action!=MotionEvent.ACTION_CANCEL)// && flag==true)
    {
        Log.d("TouchView","ACTION_DOWN ");
        Point pointer = new Point();
        pointer.x = (int) event.getX();
        pointer.y = (int) event.getY();
        touchPoint.add(pointer);
        view.invalidate();
        Log.d("MotionEvent.ACTION_DOWN", "point: " + pointer);
        action = MotionEvent.ACTION_CANCEL;
        flag = false;
    }
    else if(action == MotionEvent.ACTION_UP && action!=MotionEvent.ACTION_CANCEL)// && flag==true)
    {
        Log.d("TouchView","ACTION_UP");
        Point pointer = new Point();
        pointer.x = (int) event.getX();
        pointer.y = (int) event.getY();
        touchPoint.add(pointer);
        view.invalidate();
        Log.d("MotionEvent.ACTION_UP", "point: " + pointer);
        action = MotionEvent.ACTION_CANCEL;
        flag = false;
    }
    else return false;
}

最佳答案

将为每个MotionEvent.ACTION_DOWNMotionEvent.ACTION_UPMotionEvent.ACTION_MOVE调用touchListener。因此,如果您只想执行一次代码,即MotionEvent.ACTION_DOWN然后里面

onTouch()
 if (event.getAction() == MotionEvent.ACTION_DOWN) {
//your code
}

07-24 09:46
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