SimpleAdapter使用案例

来源：互联网发布：淘宝网1元秒杀在哪里找编辑：程序博客网时间：2024/06/05 16:05

页面布局

<? 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"    android :orientation= "horizontal">    <ImageView        android :id= "@+id/img"        android :layout_width= "80dp"        android :layout_height= "80dp"        android :layout_margin= "5px" />    <LinearLayout        android :layout_width= "match_parent"        android :layout_height= "match_parent"        android :orientation= "vertical">        <TextView            android :id= "@+id/title"            android :layout_width= "wrap_content"            android :layout_height= "wrap_content"            android :textColor= "#000000"            android :textSize= "100px" />        <TextView            android :id= "@+id/info"            android :layout_width= "wrap_content"            android :layout_height= "wrap_content"            android :textColor= "#000000"            android :textSize= "60px" />    </LinearLayout></LinearLayout>

用SimpleAdapter将数据显示在布局上

package com.eson.simpleadapter ;import android.app.ListActivity ;import android.os.Bundle ;import android.widget.SimpleAdapter ;import java.util.ArrayList ;import java.util.HashMap ;import java.util.List ;import java.util.Map ;public class MainActivity extends ListActivity {    @Override    protected void onCreate (Bundle savedInstanceState) {        super .onCreate(savedInstanceState) ;        SimpleAdapter simpleAdapter = new SimpleAdapter(this, getData() , R.layout. content_main ,                new String[]{"title" , "info", "img" }, new int []{R.id. title, R.id. info, R.id. img}) ;        setListAdapter(simpleAdapter) ;    }    private List<Map<String ,Object>> getData () {        List<Map<String, Object>> list = new ArrayList<Map<String , Object>>();        Map<String , Object> map = new HashMap<String , Object>() ;        map.put( "title" ,"Clock" ) ;        map.put( "info" ,"My clock on the my phone" ) ;        map.put( "img" ,R.drawable. i1 );        list.add(map) ;        map = new HashMap<String, Object>() ;        map.put( "title" ,"Earth" ) ;        map.put( "info" ,"This is a map of the earth" ) ;        map.put( "img" , R.drawable. i2 );        list.add(map) ;        map = new HashMap<String, Object>() ;        map.put( "title" ,"Go" ) ;        map.put( "info" ,"This is a go drawble" ) ;        map.put( "img" ,R.drawable. i3 );        list.add(map) ;        map = new HashMap<String, Object>() ;        map.put( "title" ,"Talk" ) ;        map.put( "info" ,"This is a talk drawble" ) ;        map.put( "img" ,R.drawable. i4 );        list.add(map) ;        map = new HashMap<String, Object>() ;        map.put( "title" ,"Bird" ) ;        map.put( "info" ,"This is a bird drawble" ) ;        map.put( "img" ,R.drawable. i5 );        list.add(map) ;        map = new HashMap<String, Object>() ;        map.put( "title" ,"Note" ) ;        map.put( "info" ,"This is a note drawble" ) ;        map.put( "img" ,R.drawable. i6 );        list.add(map) ;        return list ;    }}

SimpleAdapter有五个参数，其中后面四个参数十分关键。
>第二个参数：该参数应该是一个List<?extends Map<String,?>>类型的集合对象，该集合中每个Map<String,?>对象生成一个列表项。
>第三个参数：该参数指定一个界面布局ID。例如此处指定了R.layout.content_main,这就意味着使用/res/layout/content_main.xml文件作为列表组件。
>第四个参数：该参数应该是一个String[]类型的参数，该参数决定提取Map<String,?>对象中的key对应的value来生成列表项。
>第五个参数：该参数是一个int[]类型的参数，该参数决定填充那些组件。

1 0