Widget - FAB Alpha Animation

_fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
     AlphaAnimation animation1 = new AlphaAnimation(1, 0);
            animation1.setDuration(1000);
            animation1.setStartOffset(1000);
            animation1.setFillAfter(true);
            _fab.startAnimation(animation1);
   }
 });