android(ListView)

1.垂直的形式列出需要显示的列表,显示系统设置项或直接使用ListView组件创建,另一种是让Activity继承ListActivity实现ListView是开发中使常见的一个控件,一般会对其进行封装.QQ列表等.

2.使用资源文件的listview.

2.1XMl文件(lsitview)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/texview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />


</LinearLayout>

2.2布局文件(activity_res)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/listview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

</LinearLayout>

2.2values/string下的资源

<resources>
    <string name="app_name">android012</string>
    <string-array name="a2">
        <item>芷若</item>
        <item>无忌</item>
        <item>敏敏</item>
        <item>珠儿</item>
        <item>小昭</item>
        <item>无忌</item>
    </string-array>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/listview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

</LinearLayout>

3 ListVActivity(主类调用所有类)

package com.example.android012;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class ListVActivity extends Activity implements View.OnClickListener {

    private Button button01;
    private Button button02;
    private Button button03;
    private Button button04;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.lsitview);
        button01=findViewById(R.id.button01);
        button01.setOnClickListener(this);

        button02=findViewById(R.id.button02);
        button02.setOnClickListener(this);

        button03=findViewById(R.id.button03);
        button03.setOnClickListener(this);

        button04=findViewById(R.id.button04);
        button04.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button01:
                //创建意图
                Intent li=new Intent(this, ResActivity.class);
                startActivity(li);
            break;

            case R.id.button02:
                //创建意图
                Intent li2=new Intent(this, ArrayAdapterActivity.class);
                startActivity(li2);
                break;
                
            case R.id.button03:
                 //创建意图
                Intent li3=new Intent(this, SimpleAdapterActivity.class);
                startActivity(li3);
                break;
        }

    }
}

4.1 ResActivity

package com.example.android012;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.icu.text.Transliterator;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class ResActivity extends Activity {
    ListView list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_res);
        list = findViewById(R.id.listview);
        //定义适配器
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.a2, android.R.layout.simple_expandable_list_item_1);

        //给LIST定义适配器
        list.setAdapter(adapter);

        //监听事件
//        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//            @SuppressLint("WrongConstant")
//            @Override
//            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//                Toast.makeText(ResActivity.this,parent.getItemIdAtPosition(position),0).show();
//            }
//        });

    }

    //定义数组
    public String[] getData() {
        String[] str = new String[12];
        for (int i = 0; i < str.length; i++) {
            str[i] = "天下" + (i + 1);
        }
        return str;
    }
}

运行实例

5.使用ArrayAdapterActivity的listView文件.

package com.example.android012;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ArrayAdapterActivity extends Activity {
    private ListView lsitview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_res);
        lsitview=findViewById(R.id.listview);

        //定义适配器
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,getData());

        //给LSITVIEW定义适配器
        lsitview.setAdapter(adapter);
    }

    //定义数组
    public String[] getData(){
        String [] str=new String[12];
        for (int i=0;i<str.length;i++){
            str[i]="天下"+(i+1);
        }
        return str;
    }
}

5.1运行实例

6.使用simpleAdapterActivity

6.1创建布局(item.xml)

6.2SimpleAdapterActivity

package com.example.android012;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class SimpleAdapterActivity extends Activity {
    private ListView listView;

    //声明一个SimpleAdapter
    SimpleAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_simple);
        listView=findViewById(R.id.list2);

        //
        adapter=new SimpleAdapter(this,this.getData(),R.layout.item,new String[]{"img","title"},new int[]{R.id.img,R.id.title});//使用构造方法


        //给listView设置
        listView.setAdapter(adapter);
    }


    private List<Map<String,Object>> getData(){
        List<Map<String,Object>> list=new ArrayList<>();
        for (int i=0;i<10;i++){
            Map<String,Object>map=new HashMap<String, Object>();
            map.put("imag",R.drawable.ic_launcher_background);
            map.put("title","新闻"+(i+1));
            list.add(map);
        }
        return list;
    }
}

7.自定义的使用Adapter的listview