Can anyone explain to me why is the onTouchEvent
executed twice and how can I set it to run only once? I couldn't find an explanation. Thanks.
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
_iv = new ImageView(this);
_map = BitmapFactory.decodeResource(getResources(), R.drawable.image);
_iv.setImageBitmap(_map);
_iv.invalidate();
setContentView(_iv);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
double X = event.getX();
double Y = event.getY();
Toast.makeText(this, "X: " + X + " Y: " + Y, Toast.LENGTH_SHORT).show();
return super.onTouchEvent(event);
}
It executes for every event. In this case it would be for the ACTION_DOWN
and ACTION_UP
event. It will also execute for the ACTION_MOVE
event many, many times.
To have it only execute in one event, do something like this:
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
** CODE **
break;
case MotionEvent.ACTION_MOVE:
** CODE **
break;
case MotionEvent.ACTION_UP:
** CODE **
break;
}