如何利用ToggleButton切换图片

如何利用ToggleButton切换图片
java文件

    package com.example.administrator.app;
    import android.app.Activity;
    import android.os.Bundle;
    import android.widget.CompoundButton;
    import android.widget.ImageView;
    import android.widget.ToggleButton;
    public class toggleBtn extends Activity implements    CompoundButton.OnCheckedChangeListener {
    private ToggleButton tb;
    private ImageView img;
    protected void onCreate(Bundle saveInstanceState){
    super.onCreate(saveInstanceState);
    setContentView(R.layout.togglebutton);
    tb = (ToggleButton)findViewById(R.id.toggle_button);
    img = (ImageView) findViewById(R.id.imageView);
    /**

• 给当前的tb设置监听器
  */
  tb.setOnCheckedChangeListener(this);

}

 //Called when the checked state of a compound button has changed.
 //@param buttonView The compound button view whose state has changed.
 //@param isChecked  The new checked state of buttonView.

@Override

1. void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

      
        //实现接口CompoundButton.OnCheckedChangeListener 来设置tb监听，当点击  按钮tb的时候开始执行
       // onCheckedChanged方法
       //buttonView 代表被点击的控件按钮
       // isChecked  被点击控件的状态
       //当点击tb开关的时候，更换img的背景
      img.setBackgroundResource(isChecked?R.drawable.on:R.drawable.off);
   }

   }
   布局文件
   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical">
   <!--textOn true

      textOff false-->
    <ToggleButton
      android:checked="false"
      android:textOff="关"
      android:textOn="开"
      android:id="@+id/toggle_button"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"/>
   
    <ImageView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:id="@+id/imageView"
      android:background="@drawable/off"/>
   </LinearLayout>

   效果图: