动画翻转

  //箭头翻转动画
  animation = new RotateAnimation(0, -180,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);
  animation.setInterpolator(new LinearInterpolator());
  animation.setDuration(250);
  animation.setFillAfter(true);
  //箭头反向翻转动画
  reverseAnimation = new RotateAnimation(-180, 0,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);
  reverseAnimation.setInterpolator(new LinearInterpolator());
  reverseAnimation.setDuration(200);
  reverseAnimation.setFillAfter(true);

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