多选一机制的实现（RadioButton的实现）

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public class Helloworld extends Activity implements android.widget.RadioGroup.OnCheckedChangeListener{
//省略部分代码
private RadioGroup rg;
rg.setOnCheckedChangeListener(this);
     //通过实现接口来实现监听
public void onCheckedChanged(RadioGroup group, int checkedId) {

  // TODO Auto-generated method stub

  //checkedId 就是被选中的button的ID

  switch (checkedId) {

  case R.id.radio0:

   Toast.makeText(Helloworld.this, "男男男", 1).show();

   break;

  case R.id.radio1:

   Toast.makeText(Helloworld.this, "女女女", 1).show();

   break;

  default:

   break;

  }

 }
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