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);
   }
 });

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