先上最后的效果图
定义列表每一行的布局
res / layout / list_view_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="horizontal"><!-- 定义一个用于显示头像的ImageView --><ImageViewandroid:id="@+id/img_icon"android:layout_width="64dp"android:layout_height="64dp"android:baselineAlignBottom="true"android:paddingLeft="8dp" /><!-- 定义一个竖直方向的LinearLayout,把QQ呢称与说说的文本框设置出来 --><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><TextViewandroid:id="@+id/text_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="8dp"android:textColor="#1D1D1C"android:textSize="20sp" /><TextViewandroid:id="@+id/text_msg"android:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="8px"android:textColor="#B4B4B9"android:textSize="14sp" /></LinearLayout>
</LinearLayout>实体类
package com.clc.app2;public class Hardware {private int icon;private String name;private String msg;//无参构造函数//有参构造函数//getter and setter
}
扩展BaseAdapter
package com.clc.app2;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.LinkedList;public class HardwareAdapter extends BaseAdapter {private LinkedList<Hardware> list;private Context context;public HardwareAdapter(LinkedList<Hardware> list, Context context) {this.list = list;this.context = context;}//必须重写，且必须返回数据总条数，如下@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return null;}//必须重写，且必须返回当前遍历的索引，如下@Overridepublic long getItemId(int position) {return position;}//此方法里实现向ui控件填充数据的逻辑@Overridepublic View getView(int position, View convertView, ViewGroup parent) {/*inflate()方法：获取xml布局的View实例参数1：R.layout.list_view_item，即需要被填充数据的ui参数2：parent，指定R.layout.list_view_item要放到哪个父布局中（null和有值的区别：另做探究）参数3：是否把convertView直接放到根容器中这里先把convertView包装到listView中，然后放到root布局中，所以这里为false返回值convertView是由xml布局加载过来的View实例*/convertView = LayoutInflater.from(context).inflate(R.layout.list_view_item,parent,false);//获取xml布局中的控件ImageView imageIcon = convertView.findViewById(R.id.img_icon);TextView textName = convertView.findViewById(R.id.text_name);TextView textMsg = convertView.findViewById(R.id.text_msg);//填充数据imageIcon.setImageResource(list.get(position).getIcon());textName.setText(list.get(position).getName());textMsg.setText(list.get(position).getMsg());//返回已填充数据的convertViewreturn convertView;}
}
在MainActivity使用
package com.clc.app2;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.widget.BaseAdapter;
import android.widget.ListView;import java.util.LinkedList;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);LinkedList<Hardware> list = new LinkedList<>();list.add(new Hardware(R.mipmap.ic_launcher,"cpu","数据计算"));list.add(new Hardware(R.mipmap.ic_launcher,"显卡","图像处理"));list.add(new Hardware(R.mipmap.ic_launcher,"内存","存储进程"));list.add(new Hardware(R.mipmap.ic_launcher,"固态硬盘","存储数据"));BaseAdapter adapter = new HardwareAdapter(list,this);ListView listView = findViewById(R.id.listV1);listView.setAdapter(adapter);}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity"><ListViewandroid:id="@+id/listV1"android:layout_width="wrap_content"android:layout_height="wrap_content"app:layout_constraintLeft_toLeftOf="parent"app:layout_constraintTop_toTopOf="parent"/></androidx.constraintlayout.widget.ConstraintLayout>