My MotionEvent.ACTION_DOWN is not detected

Question

My problem is that all touch events are being detected but not the Action_Down event. the log results in events 1, 2 and not 0 (for down).

here is my code

final ViewPager homeViewPager = (ViewPager)findViewById(R.id.homeViewPager);

    homeViewPager.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch (View v, MotionEvent event){
                Log.i("ViewPager", "event " + event.getAction());
                switch (event.getAction()) {
                    case MotionEvent.ACTION_MOVE:
                        Log.i("ViewPager", "ACTION_MOVE");
                        break;
                    case MotionEvent.ACTION_DOWN:
                        Log.i("ViewPager", "ACTION_DOWN");
                        break;
                    case MotionEvent.ACTION_UP:
                        Log.i("ViewPager", "ACTION_UP ");
                        break;
                }
            return false;
        }
    });

Havener

That cant be, all touch actions begins with a action_down, then many action_move until the Action_up finishes the touch. – Underwriter

@nanoc thanks ofr trying to help, but i found the solution and wrote it – Havener

Answer 1

I found a good explanation on http://neevek.net/posts/2013/10/13/implementing-onInterceptTouchEvent-and-onTouchEvent-for-ViewGroup.html

simply: viewpager is a viewgroup so by default it passes its (down) touch events to child views

solution i override the class with this and used my viewpager class

public class MyViewPager extends ViewPager {
public MyViewPager(Context context) {
    super(context);
}

public MyViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
    return true;
}

}

Havener

Glad you got the solution however, for some classes which can't be overriden e.g. ViewPager2 we still need to depend on setOnTouchListener. Let me know any solution for the same – Hook