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

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:orientation="vertical"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

     >

 <Button

     android:id="@+id/startWifi"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:text="启动手机的wifi网卡"

     />

 <Button

     android:id="@+id/stopWifi"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:text="关闭手机的wifi网卡"

     />

 <Button

     android:id="@+id/checkWifi"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:text="检查当前wifi网卡状态"

     />

 </LinearLayout>

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

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"

     package="com.example.s01_original_e23_wifi"

     android:versionCode="1"

     android:versionName="1.0" >

     <uses-sdk

         android:minSdkVersion="8"

         android:targetSdkVersion="21" />

     <application

         android:allowBackup="true"

         android:icon="@drawable/ic_launcher"

         android:label="@string/app_name"

         android:theme="@style/AppTheme" >

         <activity

             android:name=".WifiActivity"

             android:label="@string/app_name" >

             <intent-filter>

                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />

             </intent-filter>

         </activity>

     </application>

     <!-- 以下是使用wifi访问网络所需要的权限 -->

     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>

     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>

     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

 </manifest>

 package com.example.s01_original_e23_wifi;

 import android.app.Activity;

 import android.content.Context;

 import android.net.wifi.WifiManager;

 import android.os.Bundle;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 import android.widget.Toast;

 public class WifiActivity extends Activity {

     /** Called when the activity is first created. */

     private Button startButton = null;

     private Button stopButton = null;

     private Button checkButton = null;

     private WifiManager wifiManager = null;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         startButton = (Button)findViewById(R.id.startWifi);

         stopButton = (Button)findViewById(R.id.stopWifi);

         checkButton = (Button)findViewById(R.id.checkWifi);

         startButton.setOnClickListener(new StartWifiListener());

         stopButton.setOnClickListener(new StopWifiListener());

         checkButton.setOnClickListener(new CheckWifiListener());

     }

     class StartWifiListener implements OnClickListener{

         @Override

         public void onClick(View v) {

             wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);

             wifiManager.setWifiEnabled(true);

             System.out.println("wifi state --->" + wifiManager.getWifiState());

             Toast.makeText(WifiActivity.this, "当前无线网卡状态：" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

         }

     }

     class StopWifiListener implements OnClickListener{

         @Override

         public void onClick(View arg0) {

             // TODO Auto-generated method stub

             wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);

             wifiManager.setWifiEnabled(false);

             System.out.println("wifi state --->" + wifiManager.getWifiState());

             Toast.makeText(WifiActivity.this, "当前无线网卡状态：" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

         }

     }

     class CheckWifiListener implements OnClickListener{

         @Override

         public void onClick(View v) {

             wifiManager = (WifiManager)WifiActivity.this.getSystemService(Context.WIFI_SERVICE);

             System.out.println("wifi state --->" + wifiManager.getWifiState());

             Toast.makeText(WifiActivity.this, "当前无线网卡状态：" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show();

         }

     }

 }