<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="horizontal" >

    <RadioGroup

        android:id="@+id/radioGroup1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <RadioButton

            android:id="@+id/radio0"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:checked="true"

            android:text="男" />

        <RadioButton

            android:id="@+id/radio1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="女" />

    </RadioGroup>

</LinearLayout>

package com.muke.textview_edittext;

import android.os.Bundle;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

import android.app.Activity;

public class MainActivity extends Activity implements OnCheckedChangeListener{

    private RadioGroup rg;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //第一步：初始化控件（找到需要操作的控件）

        rg = (RadioGroup) findViewById(R.id.radioGroup1);

        //第二步：实现RadioGroup的监听事件

        rg.setOnCheckedChangeListener(this);

    }

    @Override

    public void onCheckedChanged(RadioGroup group, int checkedId) {

        //checkedId表示被选中的那个RadioButton的id

        switch(checkedId){

        case R.id.radio0:

            System.out.println("男被选中");

            break;

        case R.id.radio1:

            System.out.println("女被选中");

            break;

        }

    }

}