单选框的使用--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); //获取单选按钮组
  //为单选按钮组添加事件监听
  sex.setOnCheckedChangeListener(new OnCheckedChangeListener() {

   @Override
   public void onCheckedChanged(RadioGroup group, int checkedId) {
    RadioButton r = (RadioButton) findViewById(checkedId); //获取被选择的单选按钮
    Log.i("单选按钮", "您的选择是：" + r.getText());
   }
  });
  Button button = (Button) findViewById(R.id.button1);  //获取提交按钮
  //为提交按钮添加单击事件监听
  button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    //通过for循环遍历单选按钮组
    for (int i = 0; i < sex.getChildCount(); i++) {
     RadioButton r = (RadioButton) sex.getChildAt(i);
     if (r.isChecked()) {//判断单选按钮是否被选中
      Log.i("单选按钮", "性别：" + r.getText());
      break;  //跳出for循环
     }
    }
   }
  });

 }
}