先上兩張效果圖：

——————————————————分割線————————————————————-

實體類

 class Msg {
        static final int TYPE_TIME = 0;
        static final int TYPE_RECEIVE = 1;
        static final int TYPE_SEND = 2;
        String content;
        int type;

        Msg(String content, int type) {
            this.content = content;
            this
 
.type = type;
        }
    }

Activity的佈局都是一樣

先說說第一張單一佈局的實現，適合介面比較簡單的時候使用

adapt

class MsgAdapter extends RecyclerView.Adapter<MsgAdapter.MyViewHolder> {
        private ArrayList<Msg> mMsgList;

        MsgAdapter(ArrayList<Msg> mMsgList) {
            this.mMsgList = mMsgList;
        }

        @Override
 

        public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = View.inflate(parent.getContext(), R.layout.item_feedback_list, null);
            return new MyViewHolder(view);
        }

        @Override
        public void onBindViewHolder(MyViewHolder holder
 
, int position) {
            Msg msg = mMsgList.get(position);
            if (msg.type == TYPE_TIME) {
                holder.tv_time.setVisibility(View.VISIBLE);
                holder.tv_receive.setVisibility(View.GONE);
                holder.tv_send.setVisibility(View.GONE);
                holder.tv_time.setText(msg.content);
            } else if (msg.type == Msg.TYPE_RECEIVE) {
                holder.tv_receive.setVisibility(View.VISIBLE);
                holder.tv_time.setVisibility(View.GONE);
                holder.tv_send.setVisibility(View.GONE);
                holder.tv_receive.setText(msg.content);
            } else {
                holder.tv_send.setVisibility(View.VISIBLE);
                holder.tv_receive.setVisibility(View.GONE);
                holder.tv_time.setVisibility(View.GONE);
                holder.tv_send.setText(msg.content);
            }
        }

        @Override
        public int getItemCount() {
            return mMsgList.size();
        }

        class MyViewHolder extends RecyclerView.ViewHolder {
            private TextView tv_receive;
            private TextView tv_time;
            private TextView tv_send;

            MyViewHolder(View itemView) {
                super(itemView);
                tv_receive = itemView.findViewById(R.id.tv_receive);
                tv_time = itemView.findViewById(R.id.tv_time);
                tv_send = itemView.findViewById(R.id.tv_send);
            }
        }
    }

第二幅圖的adapter

class MsgAdapter extends RecyclerView.Adapter {

        private Context mContext;
        private ArrayList<Msg> mMsgList;

        public MsgAdapter (Context context, ArrayList<Msg> msgList) {
            mContext = context;
            mMsgList = msgList;
        }

        @Override
        public int getItemViewType(int position) {
            return mMsgList.get(position).type;
        }

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (viewType == TYPE_TIME) {
                return  new TimeViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_msg_time,parent,false));
            } else if (viewType == TYPE_RECEIVE) {
                return  new ReceiveMsgViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_msg_receive,parent,false));
            } else {
                return  new SendMsgViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_msg_send,parent,false));
            }
        }

        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            if (holder instanceof TimeViewHolder) {
                ((TimeViewHolder) holder).tv_msg_time.setText(mMsgList.get(position).content);
            } else if (holder instanceof ReceiveMsgViewHolder) {
                ((ReceiveMsgViewHolder) holder).tv_receive_msg.setText(mMsgList.get(position).content);
            } else {
                ((SendMsgViewHolder) holder).tv_send_msg.setText(mMsgList.get(position).content);
            }
        }

        class SendMsgViewHolder extends RecyclerView.ViewHolder {
            ImageView iv_send_face;
            TextView tv_send_msg;

            public SendMsgViewHolder(View itemView) {
                super(itemView);
                iv_send_face = itemView.findViewById(R.id.iv_send_face);
                tv_send_msg = itemView.findViewById(R.id.tv_send_msg);
            }
        }

        class ReceiveMsgViewHolder extends RecyclerView.ViewHolder {
            ImageView iv_receive_face;
            TextView tv_receive_msg;

            public ReceiveMsgViewHolder(View itemView) {
                super(itemView);
                iv_receive_face = itemView.findViewById(R.id.iv_receive_face);
                tv_receive_msg = itemView.findViewById(R.id.tv_receive_msg);
            }
        }

        class TimeViewHolder extends RecyclerView.ViewHolder {
            TextView tv_msg_time;

            public TimeViewHolder(View itemView) {
                super(itemView);
                tv_msg_time = itemView.findViewById(R.id.tv_msg_time);
            }
        }

        @Override
        public int getItemCount() {
            return mMsgList.size();
        }
    }