spinner下拉框组件

<string-array name="city_name">
        <item>浙江</item>
        <item>上海</item>
        <item>北京</item>
    </string-array>

<Spinner 
        android:id="@+id/citySelect"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:entries="@array/city_name"
        />

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mCitySelect = (Spinner) findViewById(R.id.citySelect);
    
        mCitySelect2 = (Spinner) findViewById(R.id.citySelect2);
        String arr[] = {"孙悟空", "猪八戒", "唐曾"};
        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_gallery_item, arr);
        //为适配器设置下拉样式
        adapter.setDropDownViewResource(android.R.layout.simple_selectable_list_item);
        mCitySelect2.setAdapter(adapter);
        
        mCitySelect2.setOnItemSelectedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {
        mTxtShow = (TextView) findViewById(R.id.txtShow);
        mTxtShow.setText("您选择的是："+adapter.getItem(arg2));
    }