（1）选用radioGroup的图标

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="44dp"
        android:text="性别："
        android:textSize="20dp" />

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/textView1"
        android:layout_marginLeft="21dp"
        android:layout_toRightOf="@+id/textView1"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:onClick="onRadioButtonClicked"
            android:text="男" />

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onRadioButtonClicked"
            android:text="女" />

        <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="onRadioButtonClicked"
            android:text="保密" />
    </RadioGroup>

</RelativeLayout>

package com.lc.radiobutton;

import com.example.radiobutton.R;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.Toast;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	/*
	 * 设置radio的点击事件，当点击的时候显示文字
	 */
	public void onRadioButtonClicked(View view) {
		RadioButton button = (RadioButton) view;
		boolean isChecked = button.isChecked();
		switch (view.getId()) {
		case R.id.radio0:
			if (isChecked) {
				Toast.makeText(MainActivity.this, button.getText(), 1).show();
			}
			break;
		case R.id.radio1:
			if (isChecked) {
				Toast.makeText(MainActivity.this, button.getText(), 1).show();
			}
			break;
		case R.id.radio2:
			if (isChecked) {
				Toast.makeText(MainActivity.this, button.getText(), 1).show();
			}
			break;

		default:
			break;
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

Android学习笔记之RadioButton的使用详解