騰訊公益賽個人衝刺部落格13（2024.5.30）

今天改一下主聊天介面的格式，使它成為按條列分佈的格式

package com.example.helppeople.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.example.helppeople.R;
import com.example.helppeople.entity.ChatBean;

import java.util.List;

public class ChatAdapter extends BaseAdapter {
    private List<ChatBean> chatBeanList;//聊天資料
    private LayoutInflater layoutInflater;
    private static final int VIEW_TYPE_RECEIVE = 0;
    private static final int VIEW_TYPE_SEND = 1;

    public ChatAdapter(List<ChatBean> chatBeanList, Context context) {
        this.chatBeanList = chatBeanList;
        layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return chatBeanList.size();
    }

    @Override
    public Object getItem(int position) {
        return chatBeanList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        return 2; // 兩種型別的佈局：接收和傳送
    }

    @Override
    public int getItemViewType(int position) {
        if (chatBeanList.get(position).getState() == ChatBean.RECEIVE) {
            return VIEW_TYPE_RECEIVE;
        } else {
            return VIEW_TYPE_SEND;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Holder holder;
        int viewType = getItemViewType(position);
        if (convertView == null) {
            holder = new Holder();
            if (viewType == VIEW_TYPE_RECEIVE) {
                convertView = layoutInflater.inflate(R.layout.chatting_left_item, parent, false);
            } else {
                convertView = layoutInflater.inflate(R.layout.chatting_right_item, parent, false);
            }
            holder.tv_chat_content = convertView.findViewById(R.id.tv_chat_content);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }

        holder.tv_chat_content.setText(chatBeanList.get(position).getMessage());
        return convertView;
    }

    class Holder {
        TextView tv_chat_content;//聊天內容
    }
}