OnCheckedChangeListener(处理用户在选中单选按钮的选项时触发)

    RadioGroup rg = ( RadioGroup) findById(new OnCheckedChangeListener(){

             Public void OnCheckedChanged (RadioGroup group, int checked){

                    ……

            }

    });

OnItemSelectedListenerImpl(下拉列表监听器)

  1.获得一个下拉列表控件

           Spinner spin=(Spinner)findById(R. id. xml文件中Spinner的id);

  2.定义一个下拉列表内容适配器

           ArrayAdapter<CharSequence> adapter= ArrayAdapter.createFromResource ();

           // Adapter . setDropDownViewResource ();//设置列表风格

  3.将适配器对象传入spin

           spin.setAdapter(adapter);

String text=下拉列表对象名.getSelectedItem().toString();

级联下拉列表的实现

1 public void onCreate(Bundle savedInstanceState) {
 2         super.onCreate(savedInstanceState);
 3         setContentView(R.layout.main);
 4 
 5         // 定义适配器,读取xml文件中省份的内容
 6         ArrayAdapter<CharSequence> adapter =ArrayAdapter.createFromResource(this, R.array.pro,android.R.layout.simple_spinner_item);
 7         //设置列表显示风格
 8     adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 9         //第一个下拉框
10         final Spinner spin = (Spinner)super.findViewById(R.id.Spinner01);
11         spin.setAdapter(adapter);    //将省份的适配器对象传入
12         spin.setPrompt("选择省份");
13 
14         // 定义适配器,读取xml文件中湖南省城市的内容
15         final ArrayAdapter<CharSequence> c1 = ArrayAdapter.createFromResource(
16                 this, R.array.HuNancity, android.R.layout.simple_spinner_item);
17         // 定义适配器,读取xml文件中广东省城市的内容
18         final ArrayAdapter<CharSequence> c2 = ArrayAdapter.createFromResource(
19                 this, R.array.guangdongcity,
20                 android.R.layout.simple_spinner_item);
21         
22         spin.setOnItemSelectedListener(new OnItemSelectedListener() {
23             public void onItemSelected(AdapterView<?> arg0, View view,int position, long id) {
24                 final Spinner sp1 = (Spinner)findViewById(R.id.Spinner02);
25                 // 读取【省份名称】的下拉框选中内容
26                 final String itemPro =spin.getSelectedItem().toString();
27                 if (itemPro.equals("湖南省")) {
28                     sp1.setAdapter(c1);
29                 } else if (itemPro.equals("广东省")) {
30                     sp1.setAdapter(c2);
31                 } 
32             }
33 
34             public void onNothingSelected(AdapterView<?> arg0) {}
35         });
36     }