Android ListView使用BaseAdapter适配器

最新推荐文章于 2022-09-11 01:49:14 发布

one_and_zero

最新推荐文章于 2022-09-11 01:49:14 发布

阅读量384

点赞数

文章标签： android listview

本文链接：https://blog.youkuaiyun.com/one_and_zero/article/details/111581617

版权

本文介绍了一个简单的 Android 应用示例，使用 ListView 控件展示消息列表。通过定义布局文件和适配器类，实现了自定义视图组件，并展示了如何创建消息列表数据及将其绑定到 ListView 的全过程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

效果图

在这里插入图片描述

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
	tools:context=".MainActivity"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/iv_list_image"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_marginTop="13dp"
        android:layout_marginLeft="20dp" />
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv_list_title"
            android:layout_width="200dp"
            android:layout_height="30dp"
            android:layout_marginTop="25dp"
            android:layout_marginLeft="10dp"
            android:textSize="20sp"
            android:text="123"
            android:textColor="#000"/>
        <TextView
            android:id="@+id/tv_list_text"
            android:layout_width="200dp"
            android:layout_height="25dp"
            android:text="456"
            android:layout_marginLeft="10dp"
            android:gravity="center_vertical"/>
    </LinearLayout>


</LinearLayout>

Messageitem.java

package com.example.myapplication;

public class Messageitem {
    private int imageid;
    private String title;
    private String text;

    public Messageitem(int imageid, String title, String text) {
        this.imageid = imageid;
        this.title = title;
        this.text = text;
    }

    public Messageitem() {
    }

    public int getImageid() {
        return imageid;
    }

    public void setImageid(int imageid) {
        this.imageid = imageid;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }
}

MessageAdapter.java

package com.example.myapplication;

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

import java.util.List;


public class MessageAdapter extends BaseAdapter {
    private List<Messageitem> data;
    private Context context;


    public MessageAdapter(List<Messageitem> data, Context context) {
        this.data = data;
        this.context = context;
    }

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

    @Override
    public Object getItem(int position) {
        return null;
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Messageitem messageitem = data.get(position);
        if (convertView == null){
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item,parent,false);
            ImageView image = convertView.findViewById(R.id.iv_list_image);
            TextView title = convertView.findViewById(R.id.tv_list_title);
            TextView text = convertView.findViewById(R.id.tv_list_text);

            image.setImageResource(messageitem.getImageid());
            title.setText(messageitem.getTitle());
            text.setText(messageitem.getText());
        }
        return convertView;
    }
}

MainActivity.java

package com.example.myapplication;


import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class Message extends Application {
    private int[] imageid = {R.drawable.file,R.drawable.yyb,R.drawable.school,R.drawable.file,R.drawable.yyb,R.drawable.school,R.drawable.file,R.drawable.yyb,R.drawable.school,R.drawable.file,R.drawable.yyb,R.drawable.school};
    private String[] title = {"文件传输","应用宝","乐帮校园","文件传输","应用宝","乐帮校园","文件传输","应用宝","乐帮校园","文件传输","应用宝","乐帮校园"};
    private String[] text = {".","..","...","....",".....","......",".","..","...","....",".....","......"};
    private List<Messageitem> list = new ArrayList<>();
    private ListView listView;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
		init();
		listview = findViewById(R.id.message_list);
        listView.setAdapter(new MessageAdapter(list,getActivity()));
    }
    private void init(){
        for (int i = 0;i<title.length;i++){
            Messageitem messageitem = new Messageitem(imageid[i],title[i],text[i]);
            list.add(messageitem);
        }
    }
}