setRepeatMode和setRepeatCount无效的问题

AnimationSet set = new AnimationSet(true);AlphaAnimation alpha = new AlphaAnimation(0, 1); // 由完全显示 --> 完全透明alpha.setDuration(3000); // 3秒完成动画alpha.setRepeatCount(500);alpha.setRepeatMode(Animation.REVERSE);set.addAnimation(alpha); // 增加动画set.startNow();Welcome.this.pressAnyKey.startAnimation(set); // 启动动画