Reset Android mobile network signal?

Question

I need my app to reset the device's mobile network signal. This would have the same effect as toggling airplane mode where connectivity is temporarily lost, a new IP address is assigned upon reconnection, and the LTE/signal icon in the status bar should disappear and then reappear upon reconnection. I found an app on the Play Store that I tested on my phone running Android 4.4.4 with CyanogenMod and it does exactly this, but I am unsure as to how I can implement this in my own app. I think it's related to the CHANGE_NETWORK_STATE permission. I am seeking documentation or some simple example code that will reset the network connection.

Note that I am not specifically trying to toggle airplane mode, but rather to reset the mobile data in the way that the app linked above does, as I have tested that it indeed works without even requiring root privileges.

Answer 1

Lollipop support requires a new System level privledge android.permission.MODIFY_PHONE_STATE to work.

private static boolean setMobileConnectionEnabled(Context context, boolean enabled)
{
    try{
        // Requires: android.permission.CHANGE_NETWORK_STATE
        if(Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD){
            // pre-Gingerbread sucks!
            final TelephonyManager telMgr = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
            final Method getITelephony = telMgr.getClass().getDeclaredMethod("getITelephony");
            getITelephony.setAccessible(true);
            final Object objITelephony = getITelephony.invoke(telMgr);
            final Method toggleDataConnectivity = objITelephony.getClass()
                .getDeclaredMethod(enabled ? "enableDataConnectivity" : "disableDataConnectivity");
            toggleDataConnectivity.setAccessible(true);
            toggleDataConnectivity.invoke(objITelephony);
        }
        // Requires: android.permission.CHANGE_NETWORK_STATE
        else if(Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP){
            final ConnectivityManager connMgr = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
            // Gingerbread to KitKat inclusive
            final Field serviceField = connMgr.getClass().getDeclaredField("mService");
            serviceField.setAccessible(true);
            final Object connService = serviceField.get(connMgr);
            try{
                final Method setMobileDataEnabled = connService.getClass()
                    .getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
                setMobileDataEnabled.setAccessible(true);
                setMobileDataEnabled.invoke(connService, Boolean.valueOf(enabled));
            }
            catch(NoSuchMethodException e){
                // Support for CyanogenMod 11+
                final Method setMobileDataEnabled = connService.getClass()
                    .getDeclaredMethod("setMobileDataEnabled", String.class, Boolean.TYPE);
                setMobileDataEnabled.setAccessible(true);
                setMobileDataEnabled.invoke(connService, context.getPackageName(), Boolean.valueOf(enabled));
            }
        }
        // Requires: android.permission.MODIFY_PHONE_STATE (System only, here for completions sake)
        else{
            // Lollipop and into the Future!
            final TelephonyManager telMgr = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
            final Method setDataEnabled = telMgr.getClass().getDeclaredMethod("setDataEnabled", Boolean.TYPE);
            setDataEnabled.setAccessible(true);
            setDataEnabled.invoke(telMgr, Boolean.valueOf(enabled));
        }
        return true;
    }
    catch(NoSuchFieldException e){
        Log.e(TAG, "setMobileConnectionEnabled", e);
    }
    catch(IllegalAccessException e){
        Log.e(TAG, "setMobileConnectionEnabled", e);
    }
    catch(IllegalArgumentException e){
        Log.e(TAG, "setMobileConnectionEnabled", e);
    }
    catch(NoSuchMethodException e){
        Log.e(TAG, "setMobileConnectionEnabled", e);
    }
    catch(InvocationTargetException e){
        Log.e(TAG, "setMobileConnectionEnabled", e);
    }
    return false;
}

Permission required.

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