设备所有者管理员/DevicePolicyManager,可以在 Android 上自动打开移动数据和数据漫游吗?

Device Owner Admin / DevicePolicyManager, Possible to turn on Mobile Data & Data Roaming automatically on Android?

所以我正在开发一个应用程序,它作为特定 Android 设备上的设备所有者。此应用程序在 Play 商店中不可用,但会通过 NFC 与来自不同设备的配置应用程序一起传输。由于这些设备将非常特定于某些任务(扫描 NFC 标签),我想从一开始就启用和禁用一些东西。

我想关闭声音:

devicePolicyManager.setMasterVolumeMuted(adminComponentName, true);

但这似乎根本行不通,但也不例外。

但我真正想做的是启用移动数据和漫游,我们使用的 SIM 卡支持。

devicePolicyManager.setSecureSetting(adminComponentName, Settings.Global.DATA_ROAMING, String.valueOf(1));
devicePolicyManager.setSecureSetting(adminComponentName,"mobile_data",String.valueOf(1));

但遗憾的是,这两行代码引发了安全异常:

java.lang.SecurityException: Permission denial: Device owners cannot update mobile_data

有趣的是,插入 APNs 是有效的(在代码的后面)任何机会能够作为设备打开移动数据和数据漫游 admin/owner?我的意思是,这就是成为设备管理员的全部目的,对吧?

完整代码供参考:(导致应用崩溃的部分已注释掉)

public static void enableRestrictedAppsAndSettings(Activity activity) {

        ComponentName adminComponentName = DeviceAdminReceiver.getComponentName(activity);
        DevicePolicyManager devicePolicyManager = (DevicePolicyManager) activity.getSystemService(Context.DEVICE_POLICY_SERVICE);


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            // disable keyguard and sound
            devicePolicyManager.setKeyguardDisabled(adminComponentName, true);
            devicePolicyManager.setMasterVolumeMuted(adminComponentName, true);

            devicePolicyManager.setSecureSetting(adminComponentName, Settings.Secure.LOCATION_MODE, String.valueOf(Settings.Secure.LOCATION_MODE_HIGH_ACCURACY));

            //devicePolicyManager.setSecureSetting(adminComponentName, Settings.Global.DATA_ROAMING, String.valueOf(1));
            //devicePolicyManager.setSecureSetting(adminComponentName,"mobile_data",String.valueOf(1));

        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            if (devicePolicyManager.isDeviceOwnerApp(activity.getApplicationContext().getPackageName())) {
                devicePolicyManager.enableSystemApp(adminComponentName,"com.sec.android.app.camera");

                devicePolicyManager.clearUserRestriction(adminComponentName, UserManager.DISALLOW_DATA_ROAMING);

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                    L.debug("KIOSK", "APN");
                    ApnSetting apn;

                    TelephonyManager manager = (TelephonyManager)activity.getSystemService(Context.TELEPHONY_SERVICE);
                    if (manager.getSimState() == TelephonyManager.SIM_STATE_READY) {

                        String mcc = manager.getSimOperator().substring(0, 3);
                        String mnc = manager.getSimOperator().substring(3);

                        L.debug("KIOSK " + mcc + " "+mnc);

                        apn = new ApnSetting.Builder()
                                .setApnTypeBitmask(ApnSetting.TYPE_DEFAULT)
                                .setApnName("em")
                                .setEntryName("em")
                                .setOperatorNumeric(mcc + mnc) // this is a must its consists from Telephony.Carriers.MCC + Telephony.Carriers.MNC, In my case, I had to pad the MNC with a leading zero
                                .setProtocol(ApnSetting.PROTOCOL_IPV4V6) // this is a must
                                .setRoamingProtocol(ApnSetting.PROTOCOL_IPV4V6) // this is a must
                                .setCarrierEnabled(true)
                                .build();

                        devicePolicyManager.removeOverrideApn(adminComponentName,0);
                        devicePolicyManager.addOverrideApn(adminComponentName, apn);

                        devicePolicyManager.setOverrideApnsEnabled(adminComponentName, true);
                    }
                }

            }
        }

不幸的是,设备所有者无法访问移动数据状态(你是对的,设备所有者应用的奇怪限制!)。

但是,您仍然可以获取移动数据状态,并在状态错误时强制用户打开或关闭它。这是代码示例(感谢 Test if background data and packet data is enabled or not)。

public static boolean isMobileDataEnabled(Context context) {
    ConnectivityManager cm = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
    try {
        Class clazz = Class.forName(cm.getClass().getName());
        Method method = clazz.getDeclaredMethod("getMobileDataEnabled");
        method.setAccessible(true); // Make the method callable
        // get the setting for "mobile data"
        return (Boolean) method.invoke(cm);
    } catch (Exception e) {
        // Let it will be true by default
        return true;
    }
}

此代码适用于 Android 5-9(尚未在 Android 10 上测试)。

所以你 运行 后台服务每几秒钟执行一次此检查并要求用户在状态栏中打开 on/off 移动数据。

您可以通过克隆此 open source Android MDM(这是我的项目)来查看它是如何完成的。方法在这里:Utils.isMobileDataEnabled(Context上下文).