<?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" >
  <ToggleButton
    android:checked="false"
    android:textOn="開"
    android:textOff="關"
    android:id="@+id/toggleButton1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    />
  <ImageView
    android:id="@+id/imageView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/off"
    />
</LinearLayout>

package com.example.hello;
import android.support.v7.app.ActionBarActivity;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.ToggleButton;
import android.os.Bundle;
public class MainActivity extends ActionBarActivity implements OnCheckedChangeListener {
  private ToggleButton tb;
  private ImageView img;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //初始化控件
    tb = (ToggleButton) findViewById(R.id.toggleButton1);
    img = (ImageView) findViewById(R.id.imageView1);
    //給當前的tb設置監聽器
    tb.setOnCheckedChangeListener(this);
  }
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    /*
     * 當tb被點擊的時候，執行當前方法
     * buttonView 代表被點擊的控件本身
     * isChecked 代表被點擊的控件的狀態
     *
     * 當點擊tb的時候，更換img的背景
     */
    img.setBackgroundResource(isChecked?R.drawable.on:R.drawable.off);
  }
}