public int expandAll(int position, boolean init) {
        return expandAll(position, true, !init);
    }
expand the item and all its subItems

@param position position of the item, which includes the header layout count.
@param init     whether you are initializing the recyclerView or not.
                if <strong>true</strong>, it won't notify recyclerView to redraw UI.
@return the number of items that have been added to the adapter.
common/src/main/java/com/sxjs/common/base/baseadapter/BaseQuickAdapter.java