ANDROID_MARS学习笔记_S01原始版_014_WIFI

一、代码
1.xml
(1)main.xml

 <?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>

(2)AndroidManifest.xml

 <?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>

2.java
(1)WifiActivity.java

 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();
         }

     }
 }