Android 如何打开手机网络工作？

我试图使用下面的代码打开MobileNetwork，但它不起作用，并抛出**NoSuchMethodexception**。如何打开移动网络而不出现任何异常

public void setMobileDataEnabled(boolean enabled,Context ctx) {
    try{
        final ConnectivityManager cm = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        final Class conmanClass = Class.forName(cm.getClass().getName());
        final Field connectivityManagerField = conmanClass.getDeclaredField("mService");
        connectivityManagerField.setAccessible(true);
        final Object connectivityManager = connectivityManagerField.get(cm);      
        final Class connectivityManagerClass =  Class.forName(connectivityManager.getClass().getName());
        final Method setMobileDataEnabledMethod = connectivityManagerClass.getDeclaredMethod("setMobileDataEnabled",Boolean.TYPE);
        setMobileDataEnabledMethod.setAccessible(true);
        setMobileDataEnabledMethod.invoke(connectivityManager, enabled);
    }
    catch(Exception e){
        e.printStackTrace();
    }}

这是我添加的权限

---

“android.permission.CHANGE_NETWORK_STATE”（android.permission.CHANGE_NETWORK_STATE）用于访问WIFI状态：

WifiManager wifiManager ;
wifiManager  = (WifiManager)this.getSystemService(this.WIFI_SERVICE);
wifiManager.setWifiEnabled(true);        //True - to enable WIFI connectivity .

对于访问数据/3G状态：

ConnectivityManager dataManager;
dataManager  = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
Method dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
dataMtd.setAccessible(true);
dataMtd.invoke(dataManager, true);        //True - to enable data connectivity .

现在，您需要在清单文件中添加此权限：

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