Spinner的功能和用法

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.hct.spinner.MainActivity" >

    <Spinner
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:entries="@array/books" />

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

 1 public class MainActivity extends Activity {
 2 
 3     private Spinner m_spinner;
 4 
 5     @Override
 6     protected void onCreate(Bundle savedInstanceState) {
 7         super.onCreate(savedInstanceState);
 8         setContentView(R.layout.activity_main);
 9         m_spinner = (Spinner) findViewById(R.id.spinner);
10         String[] arr = new String[] { "孙悟空", "猪八戒", "唐僧" };
11 
12         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
13                 android.R.layout.simple_list_item_multiple_choice, arr);
14         m_spinner.setAdapter(adapter);
15     }
16 
17     @Override
18     public boolean onCreateOptionsMenu(Menu menu) {
19         // Inflate the menu; this adds items to the action bar if it is present.
20         getMenuInflater().inflate(R.menu.main, menu);
21         return true;
22     }
23 
24     @Override
25     public boolean onOptionsItemSelected(MenuItem item) {
26         // Handle action bar item clicks here. The action bar will
27         // automatically handle clicks on the Home/Up button, so long
28         // as you specify a parent activity in AndroidManifest.xml.
29         int id = item.getItemId();
30         if (id == R.id.action_settings) {
31             return true;
32         }
33         return super.onOptionsItemSelected(item);
34     }
35 }