Spotify ListView header image effect

Question

The Android version of Spotify has a unique ListView header effect when viewing an artist. Basically the header image appears to maintain it\'s own scrolling speed apart fro

Answer 1

It is simply done like this, assuming you have a scrollview containing an imageview that you both have references to:

   scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
        @Override
        public void onScrollChanged() {
                    int top = scrollView.getScrollY(); // Increases when scrolling up ^
                    int newTop = (int) (top * .5f);
                    imageFrame.setTranslationY(newTop < 0 ? 0 : newTop);

        }
    });

This will scroll the imageview upwards at half speed compared to the rest of the scrollview, and also checks that it never scrolls down more than it should (past 0)