android scroll and see details like whatsup

Question

Place some icon like down arrow so that user can know there is some details are shown below in android.

after scrolled page end, scroll arrow will be gone.

Answer 1

 scrollView1.getViewTreeObserver().addOnScrollChangedListener(new OnScrollChangedListener() {

         public void onScrollChanged() {

           int scrollViewHeight = scrollView1.getChildAt(0).getHeight();


           Log.e("scrollVIEW_height", "SCROLL" + scrollViewHeight);

           double size = 0;

           DisplayMetrics dm = mContext.getResources().getDisplayMetrics();

           float screenWidth = dm.widthPixels / dm.xdpi;

           float screenHeight = dm.heightPixels / dm.ydpi;

           float i = dm.heightPixels;

           Log.e("height in i", "" + i);

           double heightininch = Math.sqrt(Math.pow(screenHeight, 2));

           Log.e("height in inch", "" + heightininch);

           size = Math.sqrt(Math.pow(screenWidth, 2) + Math.pow(screenHeight, 2));

           Log.e("screen", "" + size);

           if (size >= 6) {

             if (scrollViewHeight >= (int)i) {

               DownIndicator.setVisibility(View.VISIBLE);

               // TopIndicator.setVisibility(View.VISIBLE);

             }
           }
        }
    });