public class AndroidBamboo extends Activity 
{
    public void onCreate( Bundle savedInstanceState ) 
    {
     super.onCreate ( savedInstanceState );
        Spinner spinner = new Spinner ( this );
        spinner.setPrompt( "500" );
        String [ ] items = { "bam", "boo", "lab", "code", "programming", "framework", "android" };

ArrayAdapter array_adapter = new ArrayAdapter <String> ( this, android.R.layout.simple_spinner_item, items );
        array_adapter.setDropDownViewResource ( android.R.layout.simple_spinner_dropdown_item );
        spinner.setAdapter ( array_adapter );
        int baseline = spinner.getBaseline ( );
        setContentView ( spinner );
    }
}

public class SpinnerActivity extends Activity {
    /** Called when the activity is first created. */
    String mes = "Wolf";
    private static final String[] m_arr = {"第一组","第二组","第三组"};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main); 
       Spinner s1 = (Spinner)findViewById(R.id.Spinner01); 
       s1.setPrompt("请选择颜色" ); 
       //ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.spinnercolor,android.R.layout.simple_spinner_item);
       ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, m_arr);
       adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);   
       s1.setAdapter(adapter);  
           s1.setSelection(1,true);
       //s1.setPromptId(CONTEXT_INCLUDE_CODE);
      
       
       int baseline = s1.getBaseline();
       s1.performClick(); 
       s1.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
           public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3){
               dispToast("选择的是"+m_arr[arg2]);
               arg0.setVisibility(View.VISIBLE);
           }
           public void onNothingSelected(AdapterView<?> arg0){
               //
           }
       });
         Toast.makeText(this, s1.getPrompt() ,Toast.LENGTH_LONG).show();
    }
    public void dispToast(String str){
        Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
    }   
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, SpinnerActivity!</string>
    <string name="app_name">Spinner测试</string>
<string-array name="spinnercolor">
<item>红色</item>
<item>绿色</item>
<item>白色</item>
<item>橙色</item>
</string-array>
<string name="planet_prompt">Please Choose a Item！</string>
</resources>