多条目类型获取

adapter根据图片的路径字符串判断图片数量

@Override
public int getItemViewType(int position) {

    String image0 = list.get(position).getImage0();
    String image1 = list.get(position).getImage1();
    String image2 = list.get(position).getImage2();

    if (image0 != null && image1 == null && image2 == null) {
        return ONE;
    } else if (image0 != null && image1 != null && image2 == null) {
        return TWO;
    } else if (image0 != null && image1 != null && image2 != null) {
        return THREE;
    }

    return ONE;
}