适配器之SimpleAdapter

android里的适配器，刚开始看起来，我觉得很神奇，而且有种桃花渐欲迷人眼之感。它说白了，就是把两个不匹配的东西，连接起来，让它们能发挥作用。不匹配的东西种类多了，那自然适配器的种类也会很多。下面先介绍一种SimpleAdapter 的适配器。demo的作用是把一组图片和文字内容，放到一个下拉列表里显示出来。

MyAdapter.java 这个文件当相于数据源

public class MyAdapter {
public MyAdapter() {
// TODO Auto-generated constructor stub
}
public static List<Map<String,Object>> getListMaps(){
List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
Map<String,Object> map1 = new HashMap<String, Object>();
map1.put("Logo", R.drawable.calendar);
map1.put("applicationName", "日历");

Map<String,Object> map2 = new HashMap<String, Object>();
map2.put("Logo", R.drawable.eoemarket);
map2.put("applicationName", "eoemarket客户端");
list.add(map1);
list.add(map2);
return list;
}
}

MainActivity.java 主要的Actity程序

public class MainActivity extends ActionBarActivity {
private Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = (Spinner) this.findViewById(R.id.spinner);

List<Map<String,Object>> listmaps = MyAdapter.getListMaps();
//这是适配器的关键所在，
SimpleAdapter simpleAdapter = new SimpleAdapter(MainActivity.this, listmaps,
R.layout.item, new String[] { "Logo", "applicationName" },
new int[] { R.id.imageview, R.id.textview });

spinner.setAdapter(simpleAdapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
String appName =((Map<String,Object>)spinner.getItemAtPosition(position)).get("applicationName").toString();
setTitle(appName);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}
});

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<Spinner android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>

</LinearLayout>

item.xml

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

<ImageView
android:id="@+id/imageview"
android:layout_width="60dp"
android:layout_height="60dp"
android:src="@drawable/icon"
android:paddingLeft="10dp"/>
<TextView android:id="@+id/textview"
android:textColor="#000"
android:textSize="16dp"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:gravity="center_vertical"
android:paddingLeft="10dp"/>

</LinearLayout>

效果图如下：



源代码下载地址：http://download.csdn.net/detail/chexitianxia/9115001