小知识---点击控件闪烁

               Animation alphaAnimation = new AlphaAnimation( 1, 0.4f );
                alphaAnimation.setDuration( 300 );
                alphaAnimation.setInterpolator( new LinearInterpolator( ) );
                alphaAnimation.setRepeatCount( Animation.INFINITE );
                alphaAnimation.setRepeatMode( Animation.REVERSE );
                mainCir.startAnimation( alphaAnimation );
                /***
                *mainCir: 想要闪烁的控件
                */