ArcLayout.java 文件源码

private static Animation createShrinkAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta,
                                               long startOffset, long duration, Interpolator interpolator) {
    AnimationSet animationSet = new AnimationSet(false);
    animationSet.setFillAfter(true);

    final long preDuration = duration / 2;
    Animation rotateAnimation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f,
            Animation.RELATIVE_TO_SELF, 0.5f);
    rotateAnimation.setStartOffset(startOffset);
    rotateAnimation.setDuration(preDuration);
    rotateAnimation.setInterpolator(new LinearInterpolator());
    rotateAnimation.setFillAfter(true);

    animationSet.addAnimation(rotateAnimation);

    Animation translateAnimation = new RotateAndTranslateAnimation(0, toXDelta, 0, toYDelta, 360, 720);
    translateAnimation.setStartOffset(startOffset + preDuration);
    translateAnimation.setDuration(duration - preDuration);
    translateAnimation.setInterpolator(interpolator);
    translateAnimation.setFillAfter(true);

    animationSet.addAnimation(translateAnimation);

    return animationSet;
}