Android打开WIFI或者移动网络的代码实现

时间：2021-10-20 23:49:18

MainActivity如下:

package wy.testnetwork;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
/**
 * Demo描述:
 * 通过代码打开wifi或者移动网络
 * 
 * 学习资料:
 * 1 http://blog.csdn.net/way_ping_li/article/details/8493700
 * 2 http://*.com/questions/12535101/how-can-i-turn-off-3g-data-programmatically-on-android
 * 3 http://www.cnblogs.com/willyan/archive/2012/07/03/2574513.html
 * 4 http://ask.csdn.net/questions/152
 * 5 http://blog.csdn.net/lfdfhl/article/details/10311505
 * 6 http://blog.csdn.net/tu_bingbing/article/details/8469871
 * 7 http://blog.csdn.net/stevenhu_223/article/details/9052083
 *   Thank you very much
 *   
 * 备注说明:
 * 1 在学习资料1中还涉及到利用代码打开GPS
 * 2 通过代码打开wifi和移动网络在某些机型上是不可实现的
 *
 */
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
toggleWiFi(this, false);
toggleMobileData(this, true);
}


 //设置是否打开Wifi
private void toggleWiFi(Context context, boolean enabled) {
WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
wifiManager.setWifiEnabled(enabled);
}

/**
 * 设置是否打开移动网络
 * 
 * 但没有直接的API可调用,但是我们发现:
 * 在ConnectivityManager中有一隐藏的方法setMobileDataEnabled()
 * 源码如下:
 * public void setMobileDataEnabled(boolean enabled) {
 *   try {
 *      mService.setMobileDataEnabled(enabled);
 *   } catch (RemoteException e) {
 *      }
 * }
 * 
 * 这里的重点就是mService,查看其声明:
 * private IConnectivityManager mService;
 * 继续查看源码可知IConnectivityManager为了一个AIDL(接口interface IConnectivityManager)
 * 
 * 
 * 调用过程:
 * ConnectivityManager中有一隐藏的方法setMobileDataEnabled()
 * 在setMobileDataEnabled()中调用了IConnectivityManager中的setMobileDataEnabled(boolean)
 * 
 * 所以我们首先需要反射出ConnectivityManager类的成员变量mService(IConnectivityManager类型)
 */
private void toggleMobileData(Context context, boolean enabled) {  
    ConnectivityManager connectivityManager = 
    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    //ConnectivityManager类  
    Class<?> connectivityManagerClass = null;
    //ConnectivityManager类中的字段  
    Field connectivityManagerField = null;


    //IConnectivityManager接口
    Class<?> iConnectivityManagerClass = null;
    //IConnectivityManager接口的对象
    Object iConnectivityManagerObject = null;
    //IConnectivityManager接口的对象的方法
    Method setMobileDataEnabledMethod = null;

try {
//取得ConnectivityManager类
connectivityManagerClass = Class.forName(connectivityManager.getClass().getName());
//取得ConnectivityManager类中的字段mService
connectivityManagerField = connectivityManagerClass.getDeclaredField("mService");
//取消访问私有字段的合法性检查 
//该方法来自java.lang.reflect.AccessibleObject
connectivityManagerField.setAccessible(true);


//实例化mService
//该get()方法来自java.lang.reflect.Field
//一定要注意该get()方法的参数:
//它是mService所属类的对象
//完整例子请参见:
//http://blog.csdn.net/lfdfhl/article/details/13509839
iConnectivityManagerObject = connectivityManagerField.get(connectivityManager);
//得到mService所属接口的Class
iConnectivityManagerClass = Class.forName(iConnectivityManagerObject.getClass().getName());
//取得IConnectivityManager接口中的setMobileDataEnabled(boolean)方法
//该方法来自java.lang.Class.getDeclaredMethod
setMobileDataEnabledMethod = 
iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
//取消访问私有方法的合法性检查 
//该方法来自java.lang.reflect.AccessibleObject
setMobileDataEnabledMethod.setAccessible(true);
//调用setMobileDataEnabled方法
setMobileDataEnabledMethod.invoke(iConnectivityManagerObject,enabled);
} catch (ClassNotFoundException e) {   
    e.printStackTrace();  
} catch (NoSuchFieldException e) {   
    e.printStackTrace();  
} catch (SecurityException e) {   
    e.printStackTrace();  
} catch (NoSuchMethodException e) {   
    e.printStackTrace();  
} catch (IllegalArgumentException e) {   
    e.printStackTrace();  
} catch (IllegalAccessException e) {   
    e.printStackTrace();  
} catch (InvocationTargetException e) {   
    e.printStackTrace();  
} 
}


}


AndroidManifest.xml如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="wy.testnetwork"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="10"
        android:targetSdkVersion="10" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="wy.testnetwork.MainActivity"
            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>

</manifest>


main.xml如下:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="通过代码打开wifi或者移动网络" 
        android:layout_centerHorizontal="true"
        android:layout_marginTop="50dip"
    />

</RelativeLayout>


 

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