Android控件之CheckBox、RadioButton用法实例分析

<?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>

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);
      }
    }
  };
}