Propagating touch events

Question

I have trouble implementing something like Instagram preview image feature (on long press show dialog with enlarged image). So i have Fragment with ViewPager as its child. Adapter responsible for feeding the data to theViewPager has one imageView with onTouchListener. That listener has gestureDetector for detecting onDoubleTap and onLongPress. Now the thing is that i want onLongPress to inflate the Dialog in the parent Fragment, and on release i want to dismiss the Dialog. But for some reason, MotionEvent.ACTION_UP or MotionEvent.ACTION_CANCEL never gets called in the pagerAdapter, i guess that Dialog is intercepting the actions, and it is so frustrating, i cant implement this for days... Simply cant figure it how does TouchEvent system works.. Here is the code:

PagerAdapter:

private class MyOnTouchListener implements View.OnTouchListener {



    private GestureDetector gestureDetector = new GestureDetector(mContext, new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onDoubleTap(MotionEvent e)
            listener.performSomeAction();
            return super.onDoubleTap(e);

        }

        @Override
        public void onLongPress(MotionEvent e) {
            int action = e.getAction();
            switch (action) {
                case MotionEvent.ACTION_DOWN:
                    listener.setZoomLayout(imageUri);
                    break;
                case (MotionEvent.ACTION_UP):
                    listener.hideZoomLayout();
                    break;
                case MotionEvent.ACTION_CANCEL:
                    listener.hideZoomLayout();
                    break;
            }
            super.onLongPress(e);
        }

    });

    @Override
    public boolean onTouch(View view, MotionEvent event) {

        switch (view.getId()) {
            case R.id.ivSelectedImg1:
                gestureDetector.onTouchEvent(event);
                return true;
            case R.id.ivSelectedImg2:
                gestureDetector.onTouchEvent(event);
                return true;
            case R.id.ivSelectedImg3:
                gestureDetector.onTouchEvent(event);
                return true;
            case R.id.ivSelectedImg4:
                gestureDetector.onTouchEvent(event);
                return true;
                default: return false;
        }

    }
}

Fragment:

@Override
public void setZoomLayout(String imageUri) {
    View view = getLayoutInflater().inflate(R.layout.layout_image_zoom, null);

    ImageView zoomImage = view.findViewById(R.id.ivImageZoom);

    zoomImage.setClickable(false);
    zoomImage.setFocusable(false);


    GlideApp.with(getActivity())
            .load(imageUri)
            .into(zoomImage);

    dialogBuilder = new Dialog(getActivity(), -1);
    dialogBuilder.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialogBuilder.getWindow().setBackgroundDrawable(
            new ColorDrawable(Color.TRANSPARENT));
    dialogBuilder.setContentView(view);
    dialogBuilder.show();

Don`t get how to prevent inflating Dialog to take over the MotionEvent. I mean, i am not even sure that event is getting caught in the dialog, looks like its gone. Thanks a lot in advance!