Spinner下拉列表控件

          一、Spinner控件用于显示一个下拉列表，该控件在装载数据的时候需要创建一个Adapter适配器对象。并在创建Adapter对象过程中指定要装载的数据是数组或者是List对象的数据

           二、下面是spinner实例:

 

在main.xml文件中:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent">
    <Spinner 
        android:id="@+id/spinner1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
    <Spinner 
        android:id="@+id/spinner2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

在item.xml文件中:

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

在.java文件中:

private Spinner spinner;
    private Spinner spinner2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        spinner = (Spinner) findViewById(R.id.spinner1);
        ArrayAdapter< String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, new String[]{"aa","bb","cc","dd"});
        spinner.setAdapter(adapter);                                                   //android系统中自带布局
        
        spinner2 =(Spinner) findViewById(R.id.spinner2);
        final List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
        Map<String, Object > map = new HashMap<String, Object>();
        map.put("name", "girl1");
        map.put("image", R.drawable.gril1);
        data.add(map);
        map = new HashMap<String, Object>();
        map.put("name", "girl2");
        map.put("image", R.drawable.gril2);//将图片id地址加载到map中，布局中的imageview会自动显示对应图片
        data.add(map);
        map = new HashMap<String, Object>();
        map.put("name", "gir3");
        map.put("image", R.drawable.gril3);
        data.add(map);
        SimpleAdapter adapter2 = new SimpleAdapter(MainActivity.this, data,R.layout.item, new String[]{"image","name"}, new int[]{R.id.imageview,R.id.textview});
        spinner2.setAdapter(adapter2);　　　　                                   //自定义布局
        spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO 自动生成的方法存根
                Map<String, Object> item =  data.get(position);
                setTitle(item.get("name").toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                // TODO 自动生成的方法存根
                
            }
        });
    }

运行结果: