View（视图）——ListView之 SimpleAdapter

Posted 2020-07-07 安然罒

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。

 

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.wang.testapp2.TestActivity8">
11 
12     <ListView
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content"
15         android:id="@+id/lv_2">
16     </ListView>
17 
18 </LinearLayout>

activity.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent">
 5 
 6     <ImageView
 7         android:layout_width="70dp"
 8         android:layout_height="70dp"
 9         android:src="@drawable/f1"
10         android:id="@+id/iv_2"/>
11     <LinearLayout
12         android:layout_width="0dp"
13         android:layout_height="match_parent"
14         android:layout_weight="1"
15         android:orientation="vertical"
16         android:layout_marginLeft="20dp"
17         android:gravity="center_vertical">
18 
19         <TextView
20             android:layout_width="match_parent"
21             android:layout_height="wrap_content"
22             android:text="名字=aaa"
23             android:id="@+id/tv_7"/>
24 
25         <TextView
26             android:layout_width="match_parent"
27             android:layout_height="wrap_content"
28             android:text="内容=aaa"
29             android:id="@+id/tv_8"/>
30 
31     </LinearLayout>
32 
33 </LinearLayout>

simple_adapter

  1 package com.example.wang.testapp2;
  2 
  3 import android.support.v7.app.AppCompatActivity;
  4 import android.os.Bundle;
  5 import android.widget.ListView;
  6 import android.widget.SimpleAdapter;
  7 
  8 import java.util.ArrayList;
  9 import java.util.HashMap;
 10 import java.util.List;
 11 import java.util.Map;
 12 import java.util.Objects;
 13 import java.util.SimpleTimeZone;
 14 
 15 public class TestActivity8 extends AppCompatActivity {
 16 
 17     ListView lv_2;
 18 
 19     @Override
 20     protected void onCreate(Bundle savedInstanceState) {
 21         super.onCreate(savedInstanceState);
 22         setContentView(R.layout.activity_test8);
 23 
 24         lv_2=(ListView)findViewById(R.id.lv_2);
 25 
 26         //1.数据集合 Layout
 27 
 28         List<Map<String,Object>> lm=new ArrayList<Map<String,Object>>();
 29 
 30         Map<String,Object> map=new HashMap<String, Object>();
 31         map.put("img",R.drawable.f1);
 32         map.put("name","美食1");
 33         map.put("content","美食1的介绍");
 34         lm.add(map);
 35 
 36         map=new HashMap<String, Object>();
 37         map.put("img",R.drawable.f2);
 38         map.put("name","美食2");
 39         map.put("content","美食2的介绍");
 40         lm.add(map);
 41 
 42         map=new HashMap<String, Object>();
 43         map.put("img",R.drawable.f3);
 44         map.put("name","美食3");
 45         map.put("content","美食3的介绍");
 46         lm.add(map);
 47 
 48         map=new HashMap<String, Object>();
 49         map.put("img",R.drawable.f4);
 50         map.put("name","美食4");
 51         map.put("content","美食4的介绍");
 52         lm.add(map);
 53 
 54         map=new HashMap<String, Object>();
 55         map.put("img",R.drawable.f5);
 56         map.put("name","美食5");
 57         map.put("content","美食5的介绍");
 58         lm.add(map);
 59 
 60         map=new HashMap<String, Object>();
 61         map.put("img",R.drawable.f6);
 62         map.put("name","美食6");
 63         map.put("content","美食6的介绍");
 64         lm.add(map);
 65 
 66         map=new HashMap<String, Object>();
 67         map.put("img",R.drawable.f7);
 68         map.put("name","美食7");
 69         map.put("content","美食7的介绍");
 70         lm.add(map);
 71 
 72         map=new HashMap<String, Object>();
 73         map.put("img",R.drawable.f8);
 74         map.put("name","美食8");
 75         map.put("content","美食8的介绍");
 76         lm.add(map);
 77 
 78         map=new HashMap<String, Object>();
 79         map.put("img",R.drawable.f9);
 80         map.put("name","美食9");
 81         map.put("content","美食9的介绍");
 82         lm.add(map);
 83 
 84         map=new HashMap<String, Object>();
 85         map.put("img",R.drawable.f10);
 86         map.put("name","美食10");
 87         map.put("content","美食10的介绍");
 88         lm.add(map);
 89 
 90         //数组 key的数组
 91         String [] strings={"img","name","content"};
 92         int [] ids={R.id.iv_2,R.id.tv_7,R.id.tv_8};
 93 
 94         //2.创建simpleAdapter
 95         SimpleAdapter simpleAdapter=new SimpleAdapter(this,
 96                 lm,R.layout.simple_adapter,strings,ids);
 97 
 98         lv_2.setAdapter(simpleAdapter);
 99     }
100 }

activity.java