View（视图）——ListView之 SimpleAdapter

一.概念

    列表视图；用来显示多个可滑动项列表的ViewGroup；需要适配器Adapter 将集合中数据和每一个Item所对应的布局动态适配到ListView中进行显示。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.wang.testapp2.TestActivity8">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/lv_2">
    </ListView>

</LinearLayout>

<?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">

    <ImageView
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:src="@drawable/f1"
        android:id="@+id/iv_2"/>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:layout_marginLeft="20dp"
        android:gravity="center_vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="名字=aaa"
            android:id="@+id/tv_7"/>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="内容=aaa"
            android:id="@+id/tv_8"/>

    </LinearLayout>

</LinearLayout>

package com.example.wang.testapp2;

import android.support.v7.app.AppCompatActivity;
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;
import java.util.Objects;
import java.util.SimpleTimeZone;

public class TestActivity8 extends AppCompatActivity {

    ListView lv_2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test8);

        lv_2=(ListView)findViewById(R.id.lv_2);

        //1.数据集合 Layout

        List<Map<String,Object>> lm=new ArrayList<Map<String,Object>>();

        Map<String,Object> map=new HashMap<String, Object>();
        map.put("img",R.drawable.f1);
        map.put("name","美食1");
        map.put("content","美食1的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f2);
        map.put("name","美食2");
        map.put("content","美食2的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f3);
        map.put("name","美食3");
        map.put("content","美食3的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f4);
        map.put("name","美食4");
        map.put("content","美食4的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f5);
        map.put("name","美食5");
        map.put("content","美食5的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f6);
        map.put("name","美食6");
        map.put("content","美食6的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f7);
        map.put("name","美食7");
        map.put("content","美食7的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f8);
        map.put("name","美食8");
        map.put("content","美食8的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f9);
        map.put("name","美食9");
        map.put("content","美食9的介绍");
        lm.add(map);

        map=new HashMap<String, Object>();
        map.put("img",R.drawable.f10);
        map.put("name","美食10");
        map.put("content","美食10的介绍");
        lm.add(map);

        //数组 key的数组
        String [] strings={"img","name","content"};
        int [] ids={R.id.iv_2,R.id.tv_7,R.id.tv_8};

        //2.创建simpleAdapter
        SimpleAdapter simpleAdapter=new SimpleAdapter(this,
                lm,R.layout.simple_adapter,strings,ids);

        lv_2.setAdapter(simpleAdapter);
    }
}