mars老师[Android开发视频教学]01_23 WIFI网络操作

http://blog.csdn.net/wwj_748/article/details/7746319



布局文件：main.xml

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<SPAN style="FONT-FAMILY: KaiTi_GB2312; FONT-SIZE: 18px"><?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" 
    > 
<TextView   
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="@string/hello" 
    /> 
<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></SPAN> 

<?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"
    >
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<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>
在manifest文件设置权限：AndroidManifest.xml

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<SPAN style="FONT-FAMILY: KaiTi_GB2312; FONT-SIZE: 18px"><?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="mars.wifi" android:versionCode="1" android:versionName="1.0"> 
    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
        <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> 
    <uses-sdk android:minSdkVersion="4" /> 
    <!-- 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> 
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission> 
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> 
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> 
</manifest> </SPAN> 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="mars.wifi" android:versionCode="1" android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<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>
<uses-sdk android:minSdkVersion="4" />
<!-- 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>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission>
</manifest>


==>WifiActivity.java

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<SPAN style="FONT-FAMILY: KaiTi_GB2312; FONT-SIZE: 18px">package mars.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Wifi网卡状态为" + 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Wifi网卡状态为" + 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Wifi网卡状态为" + wifiManager.getWifiState(), Toast.LENGTH_SHORT).show(); 
        } 
         
    } 
}</SPAN>