场景:
个人开发的省电APP,有这么一个功能,可以快速打开GPRS数据,关闭GPRS数据,这算是必须的功能,放在之前,很好解决,但是现在,安卓越来越考虑用户体验和安全性,那么给非系统APP的权限就越来越少了!
问题来了:
从 Android 2.1 < API 7 >到 Android 4.4 < API 19 >setMobileDataEnabled()可以通过反射方式被调用了, 但是到了Android L以后 ,即使你有root权限, setMobileDataEnabled() method 也不能被调用,捷径没有了! 可以自己打印一下 看这个方法 还有没有

        final Class<?> conmanClass = Class.forName(context.getSystemService(Context.CONNECTIVITY_SERVICE).getClass().getName());
        final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
        iConnectivityManagerField.setAccessible(true);
        final Object iConnectivityManager = iConnectivityManagerField.get(context.getSystemService(Context.CONNECTIVITY_SERVICE));
        final Class<?> iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
        final Method[] methods = iConnectivityManagerClass.getDeclaredMethods();
        for (final Method method : methods) {
            if (method.toGenericString().contains("set")) {
                Log.i("TESTING", "Method: " + method.getName());
            }
        }

安卓5.0 LOLLIPOP之前的判断移动数据是否打开的做法:

     /**
     * 反射获得IConnectivityManager实例
     *
     * @param context
     * @return
     */
    private Object getConnectivityManager(Context context) {
        ConnectivityManager conMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        Class<?> conMgrClass = null;
        Object iConMgr = null;
        try {
            conMgrClass = Class.forName(conMgr.getClass().getName());//ConnectivityManager
            Field iConMgrField = conMgrClass.getDeclaredField("mService");//IConnectivityManager
            iConMgrField.setAccessible(true);
            iConMgr = iConMgrField.get(conMgr);//获得ConnectivityManager的IConnectivityManager实例
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        return iConMgr;
    }

    private boolean isMobileEnabled(Context context) {
        try {
            Object iConMgr = getConnectivityManager(context);//IConnectivityManager
            Class<?> iConMgrClass = Class.forName(iConMgr.getClass().getName());
            Method getMobileDataEnabledMethod = iConMgrClass.getDeclaredMethod("getMobileDataEnabled");
            getMobileDataEnabledMethod.setAccessible(true);
            return (Boolean) getMobileDataEnabledMethod.invoke(getConnectivityManager(context));
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;
    }


    private void setValue(Context context, boolean isopen) {
        try {
            Object iConMgr = getConnectivityManager(context);//IConnectivityManager
            Class<?> iConMgrClass = Class.forName(iConMgr.getClass().getName());
            Method setMobileDataEnabledMethod = iConMgrClass.getDeclaredMethod("setMobileDataEnabled", Boolean.class);
            setMobileDataEnabledMethod.setAccessible(true);
            setMobileDataEnabledMethod.invoke(iConMgr, isopen);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 判断GPRS是否打开
     *
     * @return
     */
    public boolean isOn() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            return isMobileDataEnabledFromLollipop(mContext);
        }
        return isMobileEnabled(mContext);
    }


    private boolean isMobileDataEnabledFromLollipop(Context context) {
        boolean state = false;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            state = Settings.Global.getInt(context.getContentResolver(), "mobile_data", 0) == 1;
        }
        return state;
    }

5.0之后可以这样判断网络是否打开Settings.Global.getInt(context.getContentResolver(), “mobile_data”, 0),但是没有ROOT权限依然很难主动打开GPRS,宝宝心里苦啊

如果你是系统APP,那么好办了这里我查了下,有2种方法

第一种:

    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;
    }

IConnectivityManager的原方法被搬到 TelephonyManager , 多亏了getDataEnabled和setDataEnabled这左膀右臂~~~,又可以愉快的玩耍了

第二种:
涉及Settings.Global类的mobile_data属性Settings.Global.getInt(contentResolver, “mobile_data”);

为了使能 mobile data 咱们可以用 shell commands 在ROOT设备上

(1=enable, 0=disable)
:settings put global mobile_data 1
settings put global mobile_data 0

没权限,没权限,没权限,重要的事说三遍~~~