android scroll and see details like whatsup -

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place icon down arrow user can know there details shown below in android.

enter image description here

after scrolled page end, scroll arrow gone.

 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 = 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);               }            }         }     });

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