單選框的使用--RadioGroup

public class MainActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  final RadioGroup sex = (RadioGroup) findViewById(R.id.radioGroup1); //獲取單選按鈕組
  //爲單選按鈕組添加事件監聽
  sex.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   @Override
   public void onCheckedChanged(RadioGroup group, int checkedId) {
    RadioButton r = (RadioButton) findViewById(checkedId); //獲取被選擇的單選按鈕
    Log.i("單選按鈕", "您的選擇是：" + r.getText());
   }
  });
  Button button = (Button) findViewById(R.id.button1);  //獲取提交按鈕
  //爲提交按鈕添加單擊事件監聽
  button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    //經過for循環遍歷單選按鈕組
    for (int i = 0; i < sex.getChildCount(); i++) {
     RadioButton r = (RadioButton) sex.getChildAt(i);
     if (r.isChecked()) {//判斷單選按鈕是否被選中
      Log.i("單選按鈕", "性別：" + r.getText());
      break;  //跳出for循環
     }
    }
   }
  });

 }
}