Android入门之单选按钮(RadioButton)

MainActivity.java

package com.jk.test;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.widget.CompoundButton;import android.widget.CompoundButton.OnCheckedChangeListener;import android.widget.RadioButton;import android.widget.RadioGroup;public class MainActivity extends Activity {private RadioButton eatButton;private RadioButton sleepButton;private RadioButton dotaButton;private RadioGroup groupButton;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);eatButton = (RadioButton) findViewById(R.id.eatButtonid);sleepButton = (RadioButton) findViewById(R.id.sleepButtonid);dotaButton = (RadioButton) findViewById(R.id.dotaButtonid);RadioGroupListener listener1 = new RadioGroupListener();groupButton.setOnCheckedChangeListener(listener1);RadioButtonListener listener2 = new RadioButtonListener();eatButton.setOnCheckedChangeListener(listener2);sleepButton.setOnCheckedChangeListener(listener2);dotaButton.setOnCheckedChangeListener(listener2);}class RadioButtonListener implements OnCheckedChangeListener{public void onCheckedChanged(CompoundButton v, boolean isChecked) {System.out.println(v.getId()+"isChecked--->" + isChecked);}}  class RadioGroupListener implements android.widget.RadioGroup.OnCheckedChangeListener{public void onCheckedChanged(RadioGroup v, int checkedId) { if(checkedId == eatButton.getId()) System.out.println("选中了eatButton"); else if(checkedId == sleepButton.getId()) System.out.println("选中了sleepButton"); else if(checkedId == dotaButton.getId()) System.out.println("选中了dotaButton");}}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;}}

activity_main.xml

<LinearLayout 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/radioGroupId"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:orientation="horizontal"> <RadioButton    android:id="@+id/eatButtonid"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="吃饭"    />     <RadioButton             android:id="@+id/sleepButtonid"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="睡觉"    /> <RadioButton    android:id="@+id/dotaButtonid"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="dota"    /> </RadioGroup></LinearLayout>