RecyclerView 实现多布局

主要操作实在Adapter中的。区别于正常RecyclerView的Adapter。首先是定义几个全局的变量来标识有几种布局。

    public static final int HEADER_ITEM = 1;
    public static final int TWO_ITEM = 2;
    public static final int THREE_ITEM = 3;

然后除了正常的方法之外，还要重写getItemViewType的方法，其中根据不同的判断条件来返回不同的结果。

   @Override
        public int getItemViewType(int position) {
            if (list.get(position).getFromtype().equals("2")) {
                return TWO_ITEM;
            } else if (list.get(position).getFromtype().equals("1")) {
                return HEADER_ITEM ;
            } else {
                return THREE_ITEM;
            }
        }

在onCreateViewHolder中也要进行区分，以加载不同的item布局（有几种布局就创建几个ViewHolder）。

    @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            // 给ViewHolder设置布局文件
            RecyclerView.ViewHolder holder = null;
            if (HEADER_ITEM == viewType) {
                View v = inflater.inflate(R.layout.layout_dbxianshi, parent, false);
                holder = new ViewHolder1(v);
            } else if (TWO_ITEM == viewType) {
                View v = inflater.inflate(R.layout.layout_dbshenhe, parent, false);
                holder = new ViewHolder2(v);
            } else {
                View v = inflater.inflate(R.layout.layout_dbfj, parent, false);
                holder = new ViewHolder3(v);
            }
            return holder;
        }

最后在onBindViewHolder中对每种布局进行不同的操作。

   @Override
        public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
            DBXQModel model = list.get(position);
            if (holder instanceof ViewHolder1) {
                ((ViewHolder1) holder).label.setText(model.getLabel());
                ((ViewHolder1) holder).content.setText(model.getContent());
            } else if (holder instanceof ViewHolder2) {
                ((ViewHolder2) holder).label.setText(model.getLabel());
                ((ViewHolder2) holder).content.setText(model.getContent());
                ((ViewHolder2) holder).name.setText(model.getName());
                ((ViewHolder2) holder).time.setText(model.getTime());
            } else {
                ((ViewHolder3) holder).name_fj.setText(model.getLabel());
            }
            holder.itemView.setTag(position);
     
        }