WelcomeSnowActy.java 文件源码

private TranslateAnimation randomTranslate(int startTopInParent, int duration, AnimationListener l) {
    float halfPercent = (1 + startTopInParent * 1.0f / mScreenHeight) / 2;
    TranslateAnimation trans = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0, Animation.RELATIVE_TO_SELF, (float) ((Math.random() > 0.5f ? 1 : -1) * Math.random()) * 5,
            Animation.RELATIVE_TO_PARENT, 0, Animation.RELATIVE_TO_PARENT, (float) (Math.random() * halfPercent + halfPercent));
    trans.setInterpolator(this, android.R.anim.linear_interpolator);
    trans.setStartOffset(0);
    trans.setDuration(duration);
    trans.setAnimationListener(l);
    return trans;
}