안드로이드 네트워크 ON/OFF

Question

private void setMobileDataEnabled(Context context, boolean enabled) {
        final ConnectivityManager conman =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        try {
            final Class conmanClass = Class.forName(conman.getClass().getName());
            final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
            iConnectivityManagerField.setAccessible(true);
            final Object iConnectivityManager = iConnectivityManagerField.get(conman);
            final Class iConnectivityManagerClass = Class.forName(
                    iConnectivityManager.getClass().getName());
            final Method setMobileDataEnabledMethod = iConnectivityManagerClass
                    .getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
            setMobileDataEnabledMethod.setAccessible(true);

            setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void dataOn(View v) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException {

//        final TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
        setMobileDataState(true);
    }

    public void dataOff(View v) {
        setMobileDataState(false);
    }

    public void isDataCheck(View v) {
        String status = NetworkUtil.getConnectivityStatusString(getApplicationContext());
        Toast.makeText(getApplicationContext(), status, 1).show();
    }


    public void setMobileDataState(boolean mobileDataEnabled)
    {
        try
        {
            TelephonyManager telephonyService = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

            Method setMobileDataEnabledMethod = telephonyService.getClass().getDeclaredMethod("setDataEnabled", boolean.class);

            if (null != setMobileDataEnabledMethod)
            {
                setMobileDataEnabledMethod.invoke(telephonyService, mobileDataEnabled);
            }
        }
        catch (Exception ex)
        {
            Log.e(TAG, "Error setting mobile data state", ex);
        }
    }

    public boolean getMobileDataState()
    {
        try
        {
            TelephonyManager telephonyService = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

            Method getMobileDataEnabledMethod = telephonyService.getClass().getDeclaredMethod("getDataEnabled");

            if (null != getMobileDataEnabledMethod)
            {
                boolean mobileDataEnabled = (Boolean) getMobileDataEnabledMethod.invoke(telephonyService);

                return mobileDataEnabled;
            }
        }
        catch (Exception ex)
        {
            Log.e(TAG, "Error getting mobile data state", ex);
        }

        return false;
    }

E/ContentValues: Error setting mobile data state
    java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at com.example.jjk.myapplication.MainActivity.setMobileDataState(MainActivity.java:55)
        at com.example.jjk.myapplication.MainActivity.dataOff(MainActivity.java:36)
        at java.lang.reflect.Method.invoke(Native Method)
        at android.view.View$DeclaredOnClickListener.onClick(View.java:4735)
        at android.view.View.performClick(View.java:5697)
        at android.widget.TextView.performClick(TextView.java:10826)
        at android.view.View$PerformClick.run(View.java:22526)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:158)
        at android.app.ActivityThread.main(ActivityThread.java:7224)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
     Caused by: java.lang.SecurityException: Neither user 10200 nor current process has android.permission.MODIFY_PHONE_STATE.
        at android.os.Parcel.readException(Parcel.java:1620)
        at android.os.Parcel.readException(Parcel.java:1573)
        at com.android.internal.telephony.ITelephony$Stub$Proxy.setDataEnabled(ITelephony.java:4612)
        at android.telephony.TelephonyManager.setDataEnabled(TelephonyManager.java:5221)
        at android.telephony.TelephonyManager.setDataEnabled(TelephonyManager.java:5208)
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.example.jjk.myapplication.MainActivity.setMobileDataState(MainActivity.java:55) 
        at com.example.jjk.myapplication.MainActivity.dataOff(MainActivity.java:36) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at android.view.View$DeclaredOnClickListener.onClick(View.java:4735) 
        at android.view.View.performClick(View.java:5697) 
        at android.widget.TextView.performClick(TextView.java:10826) 
        at android.view.View$PerformClick.run(View.java:22526) 
        at android.os.Handler.handleCallback(Handler.java:739) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:158) 
        at android.app.ActivityThread.main(ActivityThread.java:7224) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

버튼 두개 넣고 ON OFF 넣고 onclick 설정해놨는데 모바일 데이터가 ON OFF 가 안되고 에러가 나네요

구글링 해봤는데 어디서는 5.0이상에서는 안된다 이런 얘기들이 있나요??? 그렇다면 관련자료를 보고싶습니다. 여러 코드들 해봤는데 뭐가 문제일까요?

그리고 만약 되는 소스가 있다면 8.0 버전에서 되는 소스가 있을까요?