AnimUtils.java 文件源码

public static void showFab(@Nullable FloatingActionButton fab) 
{
       if (fab == null)
        return;

       if (ViewCompat.isLaidOut(fab)) 
    {
           fab.show();
           return;
       }
       fab.animate().cancel();
       fab.setScaleX(0f);
       fab.setScaleY(0f);
       fab.setAlpha(0f);
       fab.setVisibility(View.VISIBLE);
       fab.animate().setDuration(200).scaleX(1).scaleY(1).alpha(1).setInterpolator(new LinearOutSlowInInterpolator());
   }