.xml代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

<TextView 
    android:id="@+id/show"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="您的性别是："
    android:textSize="20px"
    />
<RadioGroup 
    android:id="@+id/sex"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:checkedButton="@+id/male"
    >
    <RadioButton
    android:id="@+id/male"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="男"/>
    <RadioButton
    android:id="@+id/female"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="女"/>
    
</RadioGroup>

</LinearLayout>

package org.lxh.demo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

public class Hello extends Activity {
	private TextView text=null;
	private RadioGroup sex=null;
	private RadioButton male=null;
	private RadioButton female=null;


	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); // 生命周期方法
		super.setContentView(R.layout.main); // 设置要使用的布局管理器
		this.text=(TextView)super.findViewById(R.id.show);
		this.sex=(RadioGroup)super.findViewById(R.id.sex);
		this.male=(RadioButton)super.findViewById(R.id.male);
		this.female=(RadioButton)super.findViewById(R.id.female);
		this.sex.setOnCheckedChangeListener(new OnCheckedChangeListerImpl());
	

	}
	private class OnCheckedChangeListerImpl implements OnCheckedChangeListener{

		public void onCheckedChanged(RadioGroup group, int checkedId) {
			String temp=null;
			if(Hello.this.male.getId()==checkedId){
				temp=Hello.this.male.getText().toString();
			}
			if(Hello.this.female.getId()==checkedId){
				temp=Hello.this.female.getText().toString();
			}
			Hello.this.text.setText("您的性别是："+temp);
			
		}
		
	}
}

源码下载：http://download.csdn.net/detail/yayun0516/8363587

Android--OnCheckedChangeListener实例