OnTouchListener的Ontouch事件获取的机器人叫了两声

问题描述

我创造中都在运行时给定的两点之间产生一条线的应用的新。
我看到的问题是， onTouch（）被调用了两次，每点击我的模拟器。我知道，两个动作（ ACTION_DOWN ＆安培; ACTION_UP ）进行检查。但我想我的应用程序调用 onTouch（）只有一次。请给我一些想法。这是code，我用：

  SurfaceView surfaceview =新SurfaceView（的getContext（））;
SurfaceHolder H = surfaceview.getHolder（）;
INT行动= event.getActionMasked（）;
同步（H）{
    如果（行动== MotionEvent.ACTION_DOWN和放大器;＆安培;行动= MotionEvent.ACTION_CANCEL！）//＆安培;＆安培;标志==真）
    {
        Log.d（的TouchView，ACTION_DOWN）;
        点指针=新的点（）;
        pointer.x =（int）的event.getX（）;
        pointer.y =（int）的event.getY（）;
        touchPoint.add（指针）;
        view.invalidate（）;
        Log.d（MotionEvent.ACTION_DOWN，点+指针）;
        行动= MotionEvent.ACTION_CANCEL;
        标志= FALSE;
    }
    否则，如果（行动== MotionEvent.ACTION_UP和放大器;＆安培;行动= MotionEvent.ACTION_CANCEL！）//＆安培;＆安培;标志==真）
    {
        Log.d（的TouchView，ACTION_UP）;
        点指针=新的点（）;
        pointer.x =（int）的event.getX（）;
        pointer.y =（int）的event.getY（）;
        touchPoint.add（指针）;
        view.invalidate（）;
        Log.d（MotionEvent.ACTION_UP，点+指针）;
        行动= MotionEvent.ACTION_CANCEL;
        标志= FALSE;
    }
    否则返回false;
}
 

解决方案

touchListener将被要求每 MotionEvent.ACTION_DOWN ， MotionEvent.ACTION_UP 和 MotionEvent.ACTION_MOVE 。因此，如果要执行code只有一次，即 MotionEvent.ACTION_DOWN 然后在里面

  onTouch（）
 如果（动作== MotionEvent.ACTION_DOWN）
{
//你的code
}
 

I am creating an appliction in which a line gets generated between two points given at runtime.
The problem that I see is that onTouch() is called twice for every click on my simulator. I know that two actions (ACTION_DOWN & ACTION_UP) are checked. But I want my app to call onTouch() just once. Please give me some ideas. This is the code that I used:

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;
}

解决方案

touchListener will be called for every MotionEvent.ACTION_DOWN, MotionEvent.ACTION_UP, and MotionEvent.ACTION_MOVE . so if you want to execute code only once , ie MotionEvent.ACTION_DOWN then inside

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

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