List<BaseMedia> getMedias() {
            if (mList == null || mList.size() <= 0 || !(mList.get(0) instanceof ImageMedia)) {
                return null;
            }
            return mList;
        }
A demo to show how to use {@link AbsBoxingActivity} and all the functions.

@author ChenSL
app/src/main/java/com/bilibili/boxing/ui/FirstActivity.java