<?xml version="1.0" encoding="utf-8"?>

  
  

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);
    //给当前的tb设置监听器
    tb.setOnCheckedChangeListener(this);
  }
  @Override
  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    /*
     * 当tb被点击的时候，执行当前方法
     * buttonView 代表被点击的控件本身
     * isChecked 代表被点击的控件的状态
     *
     * 当点击tb的时候，更换img的背景
     */
    img.setBackgroundResource(isChecked?R.drawable.on:R.drawable.off);
  }
}