RadioGroup 有时候比較实用．主要特征是给用户提供多选一机制。

MainActivity.java

package com.example.lesson16_radio;import android.app.Activity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.Toast;public class MainActivity extends Activity {	private RadioGroup group_temo;	private RadioButton checkRadioButton;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		group_temo = (RadioGroup) findViewById(R.id.radioGroup1);		// 改变默认选项		group_temo.check(R.id.radio1);		// 获取默认被被选中值		checkRadioButton = (RadioButton) group_temo.findViewById(group_temo				.getCheckedRadioButtonId());		Toast.makeText(this, "默认的选项的值是:" + checkRadioButton.getText(),				Toast.LENGTH_LONG).show();		// 注冊事件		group_temo				.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {					@Override					public void onCheckedChanged(RadioGroup group, int checkedId) {						// 点击事件获取的选择对象						checkRadioButton = (RadioButton) group_temo								.findViewById(checkedId);						Toast.makeText(getApplicationContext(),								"获取的ID是" + checkRadioButton.getText(),								Toast.LENGTH_LONG).show();					}				});	}}

布局文件

<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" >    <RadioGroup        android:id="@+id/radioGroup1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true" >        <RadioButton            android:id="@+id/radio0"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:checked="true"            android:text="@string/text_java" />        <RadioButton            android:id="@+id/radio1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/text_net" />        <RadioButton            android:id="@+id/radio2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/text_php" />    </RadioGroup></RelativeLayout>