SunsetFragment.java 文件源码

private void sunsetAnimator() {
    float sunYStart = mSunView.getTop();
    float sunYEnd = mSkyView.getHeight();

    ObjectAnimator heightAnimator = ObjectAnimator.ofFloat(mSunView, "y", sunYStart, sunYEnd)
            .setDuration(3000);

    ObjectAnimator sunsetSkyAnimator = ObjectAnimator.ofInt(mSkyView, "backgroundColor",
            mBlueSkyColor, mSunsetSkyColor)
            .setDuration(3000);
    ObjectAnimator nightSkyAnimator = ObjectAnimator.ofInt(mSkyView, "backgroundColor",
            mSunsetSkyColor, mNightSkyColor)
            .setDuration(1500);

    heightAnimator.setInterpolator(new AccelerateInterpolator());
    sunsetSkyAnimator.setEvaluator(new ArgbEvaluator());
    nightSkyAnimator.setEvaluator(new ArgbEvaluator());

    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.play(heightAnimator).with(sunsetSkyAnimator).before(nightSkyAnimator);
    animatorSet.start();
}