private void updateSpecicalDanmakuDuration(BaseDanmaku item) {
        if (MAX_Duration_Special_Danmaku == null || (item.duration != null && item.duration.value > MAX_Duration_Special_Danmaku.value)) {
            MAX_Duration_Special_Danmaku = item.duration;
            updateMaxDanmakuDuration();
        }
    }
Initial alpha data of the special danmaku

@param item
@param beginAlpha
@param endAlpha
@param alphaDuraion
app/src/main/java/com/sunnyweather/android/flame/master/flame/danmaku/danmaku/model/android/DanmakuFactory.java