BallGridBeatIndicator.java 文件源码

@Override
public List<Animator> createAnimation() {
    List<Animator> animators=new ArrayList<>();

    int[] durations={960, 930, 1190, 1130, 1340, 940, 1200, 820, 1190};
    int[] delays= {360, 400, 680, 410, 710, -150, -120, 10, 320};

    for (int i = 0; i < 9; i++) {
        final int index=i;
        ValueAnimator alphaAnim=ValueAnimator.ofInt(255, 168,255);
        alphaAnim.setDuration(durations[i]);
        alphaAnim.setRepeatCount(-1);
        alphaAnim.setStartDelay(delays[i]);
        alphaAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                alphas[index] = (int) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        alphaAnim.start();
        animators.add(alphaAnim);
    }
    return animators;
}