【Android】AlertDialog与ListAdapter
16lz
2021-01-25
文章目录
- 一、setAdapter()
- 二、ArrayAdapter
- 1.简单的String
- 2.自定义
- 三、SimpleAdapter
- 1.自定义
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 { @Override protected 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() { @Override public 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"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/fruit_name"/> <ImageView android: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; } @Override public 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 { @Override protected 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() { @Override public 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"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/fruit_name"/> <ImageView android: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 { @Override protected 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() { @Override public void onClick(DialogInterface dialogInterface, int i) { Toast.makeText(MainActivity.this,name[i],Toast.LENGTH_SHORT).show(); } }); builder.show(); }}更多相关文章
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