Android控件之CheckBox、RadioButton探究

CheckBox和RadioButton控件都只有选中和未选中状态,不同的是RadioButton是单选按钮,需要编制到一个RadioGroup中,同一时刻一个RadioGroup中只能有一个按钮处于选中状态。

以下为CheckBox和RadioButton常用方法及说明

 

以下为单选按钮和复选按钮的使用方法

目录结构

 

main.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width
="fill_parent"
android:layout_height
="fill_parent"
android:scrollbars
="vertical">
<LinearLayout android:orientation="vertical"
android:layout_width
="fill_parent"
android:layout_height
="fill_parent">
<!-- RadioButton控件演示 -->
<ImageView android:id="@+id/imageView01"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:src
="@drawable/bulb_on"
android:layout_gravity
="center_horizontal" />
<RadioGroup android:id="@+id/radioGroup"
android:orientation
="horizontal"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:layout_gravity
="center_horizontal">
<RadioButton android:id="@+id/on"
android:text
="开灯"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:checked
="true" />
<RadioButton android:id="@+id/off"
android:text
="关灯"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content" />
</RadioGroup>

<!-- CheckBox控件演示 -->
<ImageView android:id="@+id/imageView02"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:src
="@drawable/bulb_on"
android:layout_gravity
="center_horizontal" />
<CheckBox android:id="@+id/checkBox"
android:text
="开灯"
android:checked
="true"
android:layout_width
="wrap_content"
android:layout_height
="wrap_content"
android:layout_gravity
="center_horizontal" />
</LinearLayout>
</ScrollView>

CbRbActivity类 

package com.ljq.activity;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class CbRbActivity extends Activity {
private ImageView imageView01=null;
private ImageView imageView02=null;
private CheckBox checkBox=null;
private RadioButton on=null;//开灯

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

imageView01
=(ImageView)findViewById(R.id.imageView01);
imageView02
=(ImageView)findViewById(R.id.imageView02);
checkBox
=(CheckBox)findViewById(R.id.checkBox);
on
=(RadioButton)findViewById(R.id.on);

on.setOnCheckedChangeListener(listener);
checkBox.setOnCheckedChangeListener(listener);
}

OnCheckedChangeListener listener
=new OnCheckedChangeListener(){

public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if(buttonView instanceof RadioButton){
imageView01.setImageResource(isChecked
?R.drawable.bulb_on:R.drawable.bulb_off);
}
else if(buttonView instanceof CheckBox){
checkBox.setText(isChecked
?"开灯":"关灯");
imageView02.setImageResource(isChecked
?R.drawable.bulb_on:R.drawable.bulb_off);
}
}
};
}

运行结果

posted on 2011-02-21 21:20  Ruthless  阅读(7325)  评论(0编辑  收藏  举报