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一、setAdapter()

使用的Adapter是ListAdapter类。
ListApdater的子类是ArrayAdapter、SimpleAdapter、BaseAdapter。

PS：RecyclerAdapter不行，不是继承的子类。

二、ArrayAdapter

1.简单的String

package com.example.hello;import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);AlertDialog.Builder builder=new AlertDialog.Builder(this);builder.setTitle("Title");final String[] fruits={"apple","banana"};ArrayAdapter<String> arrayAdapter=new ArrayAdapter<>(this,android.R.layout.simple_list_item_1,fruits);builder.setAdapter(arrayAdapter, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this,fruits[i],Toast.LENGTH_SHORT).show();}});builder.show();}
}

2.自定义

四步：

• 定义Fruit类
• 定义Item的布局
• 定义继承ArrayAdapter的FruitAdapter
• MainActivity.java中创建，之后就是绑到builder上。

定义Fruit类

package com.example.hello;public class Fruit {private String mName;private int mImageId;public Fruit(String name,int ImageId){mName=name;mImageId=ImageId;}public String getmName(){return mName;}public int getmImageId(){return mImageId;}
}

定义Item的布局：layout.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="wrap_content"android:orientation="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/fruit_name"/><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/fruit_image"/></LinearLayout>

定义继承ArrayAdapter的FruitAdapter

package com.example.hello;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;import java.util.List;public class FruitAdapter extends ArrayAdapter<Fruit> {private int mresource;public FruitAdapter(Context context, int resource, List<Fruit> objects) {super(context, resource, objects);mresource=resource;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {Fruit fruit=getItem(position);View view= LayoutInflater.from(getContext()).inflate(mresource,parent,false);ImageView fruitImage=view.findViewById(R.id.fruit_image);TextView fruitText=view.findViewById(R.id.fruit_name);fruitImage.setImageResource(fruit.getmImageId());fruitText.setText(fruit.getmName());return view;}
}

MainActivity.java中创建

package com.example.hello;import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);AlertDialog.Builder builder=new AlertDialog.Builder(this);builder.setTitle("Title");List<Fruit> data = new ArrayList<>();data.add(new Fruit("banana",R.drawable.banana));data.add(new Fruit("watermelon",R.drawable.watermelon));FruitAdapter fruitAdapter=new FruitAdapter(MainActivity.this,R.layout.layout,data);builder.setAdapter(fruitAdapter, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this,""+i,Toast.LENGTH_SHORT).show();}});builder.show();}
}

三、SimpleAdapter

1.自定义

两步：

• 定义Item的布局
• MainActivity.java中创建SimpleAdapter，之后就是绑到builder上。

<?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="wrap_content"android:orientation="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/fruit_name"/><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/fruit_image"/></LinearLayout>

package com.example.hello;import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);AlertDialog.Builder builder=new AlertDialog.Builder(this);builder.setTitle("Title");final List<Map<String,Object>> list=new ArrayList<>();final int price[]={R.drawable.banana,R.drawable.watermelon};final String[] name={"banana","watermelon"};for(int i=0;i<name.length;i++){Map<String,Object> map=new HashMap<>();map.put("name",name[i]);map.put("price",price[i]);list.add(map);}SimpleAdapter simpleAdapter=new SimpleAdapter(MainActivity.this,list,R.layout.layout,new String[]{"name","price"},new int[]{R.id.fruit_name,R.id.fruit_image});builder.setAdapter(simpleAdapter, new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialogInterface, int i) {Toast.makeText(MainActivity.this,name[i],Toast.LENGTH_SHORT).show();}});builder.show();}
}