属性动画1（无限循环匀速转动的风扇）

1.难点：

• 无限循环：

ObjectAnimation.setRepeatCount(ValueAnimator.INFINITE);

• 匀速转动

ObjectAnimation.setInterpolator(new LinearInterpolator());

2.代码：

public static ObjectAnimator getRotateAnimation(View pView, boolean isClockWise, long duration, boolean isRepeat) {
        int endAngle;
        if (isClockWise) {
            endAngle = 360;
        } else {
            endAngle = -360;
        }
        ObjectAnimator res = ObjectAnimator.ofFloat(pView, "rotation", 0, endAngle);
        res.setDuration(duration);
        res.setInterpolator(new LinearInterpolator());
        if (isRepeat) {
            res.setRepeatCount(ValueAnimator.INFINITE);
        }
        return res;
    }