<?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);  }}