该代码用于每 200 毫秒均匀地更改文本颜色。为什么第一个版本变化不均匀/闪烁，而第二个版本变化均匀？
//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);