Ontouch event of OnTouchListener gets called twice in android

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;
}

24853

小开

最佳答案

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

小开

Or just use onClickListener:

        myButton.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
//do what you gotta do
}
});

小开

Sometimes dealing with many views under the same parent cause the onTouch called many times (if they're above each other) the solution for me was

onTouch{ ...
if(event.getAction() == MotionEvent.ACTION_DOWN && isTouchEnabled()){
enableTouch(false);
//add your code here
            

//then enableTouch at the end
this.postDelayed(new Runnable() {
@Override
public void run() {
enableTouch(true);


}
}, 500);
}
add static variable touch
private static boolean enabled = true;
      

private void enableTouch(boolean enabled){
this.enabled = enabled;
}


private boolean isTouchEnabled(){
return enabled;
}