Java Android动画闪烁

该代码用于使文本颜色每200ms均匀变化一次。为什么第一个版本的颜色变化不均匀/闪烁，而第二个版本的颜色变化均匀

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

//第一版
long lt=System.currentTimeMillis（）；
文本视图电视=。。。
对于（int i=1；i<120；i++）{
最终整数cl=i%2==0？0xFFFF0000:0x00000000；
Message w=Message.get（处理程序，new Runnable（）{
公开募捐{
彩色电视机；
tv.requestLayout（）；
}
});
handler.sendMessageDelayed（w，i*200L-（System.currentTimeMillis（）-lt））；
}
//第二版
动画动画=新的AlphaAnimation（0.0f，1.0f）；
动画设定持续时间（200）//您可以使用此参数管理闪烁时间
动画设置开始偏移（20）；
动画设置重复模式（动画重新启动）；
anim.setRepeatCount（Animation.INFINITE）；
电视动画；

我以前在创建/使用动画时遇到过这个问题。完成动画后，只需调用

clearAnimation（）

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

这将确保它已经完全停止，应该是好的和顺利的，给用户你想要的体验

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

阅读更多：

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);

---

关于，

最有可能是因为存储了

动画

，并且系统知道它将多次重画，而

消息

的任务要重得多，并且不是为类似的事情而设计的。

               //first version
                long lt = System.currentTimeMillis(); 
                TextView tv = ...   
                 for (int i = 1; i < 120; i++) {
                final int cl = i % 2 == 0 ? 0xFFFF0000 : 0x00000000;
                Message w = Message.obtain(handler, new Runnable() {
                    public void run() {
                        tv.setTextColor(cl);
                        tv.requestLayout();

                    }
                });

                handler.sendMessageDelayed(w,i * 200L - (System.currentTimeMillis()-lt));

            }

                 //second version
            Animation anim = new AlphaAnimation(0.0f, 1.0f);
            anim.setDuration(200); //You can manage the time of the blink with this parameter
            anim.setStartOffset(20);
            anim.setRepeatMode(Animation.RESTART);
            anim.setRepeatCount(Animation.INFINITE);
            tv.startAnimation(anim);