public T getItem(int position) {
        if (position != -1)
            return mData.get(position);
        else
            return null;
    }
Get the data item associated with the specified position in the data set.

@param position Position of the item whose data we want within the adapter's
                data set.
@return The data at the specified position.
common/src/main/java/com/sxjs/common/base/baseadapter/BaseQuickAdapter.java