RadialSelectorView.java 文件源码

public ObjectAnimator getDisappearAnimator() {
    if (!mIsInitialized || !mDrawValuesReady) {
        Log.e(TAG, "RadialSelectorView was not ready for animation.");
        return null;
    }

    Keyframe kf0, kf1, kf2;
    float midwayPoint = 0.2f;
    int duration = 500;

    kf0 = Keyframe.ofFloat(0f, 1);
    kf1 = Keyframe.ofFloat(midwayPoint, mTransitionMidRadiusMultiplier);
    kf2 = Keyframe.ofFloat(1f, mTransitionEndRadiusMultiplier);
    PropertyValuesHolder radiusDisappear = PropertyValuesHolder.ofKeyframe(
            "animationRadiusMultiplier", kf0, kf1, kf2);

    kf0 = Keyframe.ofFloat(0f, 1f);
    kf1 = Keyframe.ofFloat(1f, 0f);
    PropertyValuesHolder fadeOut = PropertyValuesHolder.ofKeyframe("alpha", kf0, kf1);

    ObjectAnimator disappearAnimator = ObjectAnimator.ofPropertyValuesHolder(
            this, radiusDisappear, fadeOut).setDuration(duration);
    disappearAnimator.addUpdateListener(mInvalidateUpdateListener);

    return disappearAnimator;
}