I came up with two ways of doing it.
The simpler (but less ideal) one:
HorizontalScrollView scrollView = (HorizontalScrollView) findViewById(R.id.scrollView);
scrollView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
// Do stuff
}
return false;
}
});
This will get called only once when you click, drag or whatever you do with your finger. However, it will also react to all kinds of gestures, so if you want to detect only tap/click events, you need to further investigate the "event" object and filter out events you don't need. This may be more work than you would like, so you should better use a GestureDetector to do it for you.
This leads to method 2:
HorizontalScrollView scrollView = (HorizontalScrollView) findViewById(R.id.scrollView);
final GestureDetector detector = new GestureDetector(this, new OnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
// Do stuff.
return false;
}
// Note that there are more methods which will appear here
// (which you probably don't need).
});
scrollView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
detector.onTouchEvent(event);
return false;
}
});