Adnroid 闪烁动画

	最近发现一个有趣的地图社交软件spot，主页面有一个home图片闪烁动画也是换了几种思路来完成，效果如下
	![spot gif 显示效果](https://img-blog.csdnimg.cn/20190404102130154.gif)
	首先完成有红色渐变白色动画并设置无限循环播放，
	 animator = ObjectAnimator.ofInt(textView, "backgroundColor", 0xffff0000, 0xffffffff);
    animator.setEvaluator(new HsvEveluator());
    animator.setDuration(500);
    animator.start();
    HavEveluator继承TypeEveluator 自己来写求值器，系统默认的求值器可能在渐变过程中出现其他颜色。
    public class HsvEveluator implements TypeEvaluator<Integer> {

float[] startHsv = new float[3];
float[] endHsv = new float[3];
float[] outHsv = new float[3];

@Override
public Integer evaluate(float fraction, Integer startValue, Integer endValue) {
    Color.colorToHSV(startValue, startHsv);
    Color.colorToHSV(endValue, endHsv);
    outHsv[0] = startHsv[0] + (endHsv[0] - startHsv[0]) * fraction;
    outHsv[1] = startHsv[1] + (endHsv[1] - startHsv[1]) * fraction;
    outHsv[2] = startHsv[2] + (endHsv[2] - startHsv[2]) * fraction;
    int alpha = startValue >> 24 + (int) ((endValue >> 24 - startValue >> 24) * fraction);
    return Color.HSVToColor(alpha, outHsv);
}
来看看这个动画
![](https://img-blog.csdnimg.cn/20190404103723598.gif)
如果设置的duration时间短，看不出来动画完成后突然变成初始值红色，其实也能用，再加一个相反颜色渐变更好
animator = ObjectAnimator.ofInt(textView, "backgroundColor", 0xffff0000, 0xffffffff);
    animator.setEvaluator(new HsvEveluator());
    animator.setDuration(500);
    animator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {
            nextanimator.cancel();
            nextanimator.start();
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }

        @Override
        public void onAnimationRepeat(Animator animation) {

        }
    });
    animator.start();
    nextanimator = ObjectAnimator.ofInt(textView, "backgroundColor", 0xffffffff, 0xffff0000);
    nextanimator.setEvaluator(new HsvEveluator());
    nextanimator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }

        @Override
        public void onAnimationEnd(Animator animation) {
            animator.cancel();
            animator.start();
        }

        @Override
        public void onAnimationCancel(Animator animation) {

        }
        @Override
        public void onAnimationRepeat(Animator animation) {

        }
    });
    nextanimator.setDuration(500);
	附加gif图
	![最终效果](https://img-blog.csdnimg.cn/20190404105546567.gif)
	好啦，完成拉！

}