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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