<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/containt"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

   <ToggleButton
       android:checked="false"
       android:textOn="开"
       android:textOff="关"
       android:id="@+id/toggleButoon"
       android:layout_width="match_parent"
       android:layout_height="wrap_content" />
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/baby"/>
</LinearLayout>

package com.example.youyou;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
//1.初始化变量
    private ToggleButton tb;
    private ImageView img;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //2.初始化控件
        tb=(ToggleButton)findViewById(R.id.toggleButoon);
        img=(ImageView)findViewById(R.id.imageView1);
        /*
       3.给tb设置监听器
         */
        tb.setOnCheckedChangeListener(this);
    }

    /*
       当tb被点击  当前方法会被执行
       buttonView-----代表被点击控件本身
       isChecked------代表被点击控件的状态
        */
    public  void  onCheckedChanged(CompoundButton buttonView,boolean isChecked){
        img.setBackgroundResource(isChecked?R.drawable.baby:R.drawable.head);
    }
}