Android超详细讲解组件AdapterView的使用

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:stretchColumns="2"
    >
 
    <ListView
        android:id="@+id/lv1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:stretchColumns="2"
    >
 
    <ListView
        android:id="@+id/lv1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
 
</RelativeLayout>

package com.example.demo03_22;
 
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
 
 
public class myAdapater extends BaseAdapter {
    private String[] books={"Java程序设计","Android应用开发","oracle数据库管理指南","javaweb程序设计","软件工程之系统工程师之路"};
    LayoutInflater inflater;
    int id_item;
    public myAdapater(Context context,int id_item){
        this.id_item=id_item;
        inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @Override
    public int getCount() {
        return books.length;
    }
 
    @Override
    public Object getItem(int i) {
        return books[i];
    }
 
    @Override
    public long getItemId(int i) {
        return i;
    }
 
    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        TextView tv;
        tv=(TextView) inflater.inflate(id_item,viewGroup,false);
        tv.setText(books[i]);
        return tv;
    }
}

package com.example.demo03_22;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.os.Bundle;
import android.widget.ListView;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        ListView lv=(ListView) this.findViewById(R.id.lv1);
        myAdapater myAdapater=new myAdapater(this, R.layout.item);
        lv.setAdapter(myAdapater);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:stretchColumns="2"
    >
 
    <ListView
        android:id="@+id/lv1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
 
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/id_booknames"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">
 
 
    <ImageView
        android:id="@+id/book_phone"
        android:layout_width="80dp"
        android:layout_height="80dp"
 
        />
    <TextView
        android:id="@+id/book_name"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        />
 
 
 
</LinearLayout>

package com.example.demo03_22;
 
import android.annotation.SuppressLint;
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.LinearLayout;
import android.widget.TextView;
 
 
public class myAdapater extends BaseAdapter {
    private BookItem[] books={new BookItem("陈某人",R.drawable.dog),
            new BookItem("周某人",R.drawable.dog),
            new BookItem("钟某人", R.drawable.dog),
            new BookItem("林某人",R.drawable.dog),
            new BookItem("涛某人",R.drawable.dog)};
 
    LayoutInflater inflater;
    int id_item;
    public myAdapater(Context context,int id_item){
        this.id_item=id_item;
        inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    @Override
    public int getCount() {
        return books.length;
    }
 
    @Override
    public Object getItem(int position) {
        return books[position];
    }
 
    @Override
    public long getItemId(int position) {
        return position;
    }
 
    @SuppressLint("ViewHolder")@Override
    public View getView(int position, View view, ViewGroup parent) {
        LinearLayout LL=(LinearLayout)inflater.inflate(id_item,parent,false)
                ;
        ImageView iv=(ImageView)LL.findViewById(R.id.book_phone);
        iv.setImageResource(books[position].photo);
 
        TextView tv;
        tv=(TextView)LL.findViewById(R.id.book_name);
        tv.setText(books[position].name);
 
        return LL;
    }

    private class BookItem{
        String name;
        int photo;
 
        public BookItem(String name,int photo){
            this.name=name;
            this.photo=photo;
        }
    }
}

package com.example.demo03_22;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        ListView lv=(ListView) this.findViewById(R.id.lv1);
        myAdapater myAdapater=new myAdapater(this, R.layout.item);
        lv.setAdapter(myAdapater);
        lv.setOnItemClickListener(this);
    }
 
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        TextView textView=(TextView)view.findViewById(R.id.book_name);
        String name=(String)textView.getText();
        String text="确定选择"+name+"今晚打火锅吗";
        Toast.makeText(this,text,Toast.LENGTH_LONG).show();
    }
}