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_DOWN
和ACTION_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_DOWN
,MotionEvent.ACTION_UP
和MotionEvent.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
}