Что такое screen lock service на андроид
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Что такое screen lock service на андроид

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Screen Lock Service as a Device Administrator

I was looking at the device administrators of my phone in the settings and saw a device administrator called «screen lock service». It’s description is «Activating this administrator will allow the app Google play services to perform the following operations: set password rules».

A previously unsettled question is found here. I searched the net for the apk file of the application but could not find one. So as per suggestions, I ran

adb shell dumpsys package resolvers | sed -n /android.app.action.DEVICE_ADMIN_ENABLED/,/:/p 

The output for the above code was:

 android.app.action.DEVICE_ADMIN_ENABLED: 438a74 com.motorola.demo/.admin.DemoModeAdminReceiver 2acd3de com.google.android.gms/.auth.managed.admin.DeviceAdminReceiver 36b5d24 ch.deletescape.lawnchair.ci/ch.deletescape.lawnchair.gestures.handlers.SleepMethodDeviceAdmin$SleepDeviceAdmin 42aae3e com.google.android.gms/.tapandpay.admin.TpDeviceAdminReceiver 8efd08d com.google.android.gms/.kids.account.receiver.ProfileOwnerReceiver 9b4f242 com.google.android.gms/.mdm.receivers.MdmDeviceAdminReceiver a9980b6 com.oasisfeng.greenify/.DeviceAdmin b5771b7 com.google.android.gm/com.android.email.SecurityPolicy$PolicyAdmin com.motorola.internal.intent.action.INETCONDITION_REPORT: 

The data for the code is quite unsettling for the fact that none seem to correspond to screen lock service.
For reference, I am using Moto G5 Plus (not rooted, stock build with no customizations) Also note that, I own another same device which is rooted and runs Pixel-Experience (Android 10 latest build) and unfortunately it does not have the Screen Lock Service. An insight/breakdown for this application is helpful.

  • security
  • device-administrator

Screen Lock – отключить и заблокировать экран 12.3

Screen Lock – отключить и заблокировать экран 12.3. Скриншот 1 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 2 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 3 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 4 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 5 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 6 Screen Lock – отключить и заблокировать экран 12.3. Скриншот 7

Screen Lock — просто одним нажатием для блокировки и выключения экрана.

Подписывайтесь на наш Телеграм

Аппаратная кнопка питания некоторых устройств плохо разработана. Частое использование экрана включения / выключения может привести к его повреждению. Мы предоставляем программные кнопки для замены и продления срока их службы.

Различные типы кнопок:

  • Отображение на главном экране.
  • Отображение в уведомлении.
  • Поплавок над другими приложениями (плавающая кнопка).
  • Встроенная библиотека значков
  • Выбрать значок с устройства
  • Вибрация при блокировке
  • Воспроизведение звука при блокировке
  • (плавающая кнопка) Отрегулируйте размер кнопки
  • (плавающая кнопка) Настроить непрозрачность кнопки
  • (плавающая кнопка) Отображение информации о погоде
  • (плавающая кнопка) Автоматическое скрытие в полноэкранном режиме
  • (плавающая кнопка) Установите на нужную позицию на экране
  • (плавающая кнопка) Автоматическое возвращение в заданное положение
  • (В этом режиме, когда кнопка перемещается, она автоматически возвращается в заданное положение в секундах. Чтобы изменить заданное положение, просто переместите его в новое положение и удерживайте в секундах)
  • (плавающая кнопка). Длительное нажатие кнопки, чтобы открыть больше ярлыков
  • (ускорение памяти / ярлыки приложений / системные настройки / захват экрана / фонарик / . )
  • Это приложение может использовать службу доступности, чтобы кнопка блокировки плавала над другими приложениями.
  • Если вам нужно удалить наше приложение, пожалуйста, удалите его из «Настройки блокировки экрана».
  • Для этого приложения требуется политика администратора устройства для блокировки экрана.

Что такое screen lock service на андроид

Иван Осокин

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What Is A Lock Screen Service? (answered)

What Is A Lock Screen Service? (answered)

mobile|pains

Are you being asked to grant Screen Lock service to an app you just installed, and wondering if it is really required to grant a third-party application such permission? What is a lock screen service?

As part of Android’s security protocol, a third-party screen lock application requires administrator permissions to enable a lock screen on the device. Android’s Lock Screen Service manages these special permissions which are granted through the device administrator feature.

  • What is a Lock screen service and app?
  • Is Lock Screen Service safe?
  • What is a Device Administrator feature?
  • How can I find the hidden device administrator in Android?
  • How to enable Screen Lock Service?
  • Why disable Lock Screen Service?
  • Why can’t I turn off my lock screen?
  • Why is my screen lock disabled by the administrator?
  • How do I remove the screen lock on my Samsung phone?

What is a Lock screen service and app?

You can lock your device using a lock screen app. As the name suggests, a lock screen app protects your device by adding a screen lock that needs specific credentials set by the owner to unlock the device.

A screen lock app requires special permissions to access the security protocols. The device administrator grants these permissions through a system-level service known as Lock Screen Service to the app. Keep reading to see how this is used.

A lock screen works by restricting anyone from accessing the device beyond the device’s lock screen until you unlock the device. Some common types of lock screens include:

  1. PIN – generally a 4 or 6 digit passcode.
  1. Password – An alpha-numeric keyword.
  1. Pattern – Creating a correct design using the dots on the lock screen.
  1. Fingerprint Lock – Only smartphones with a built-in fingerprint scanner support this type of lock.
  1. Face ID Lock – This type of lock includes scanning a facial feature, such as an eye, to authenticate the device’s owner.

Is Lock Screen Service safe?

Smartphones now come with a built-in screen lock feature so that the user doesn’t have to depend on a third-party app to enforce this. Being a built-in feature makes it very safe.

That said, the screen lock types provided in the built-in features are limited so you might be tempted to install a third-party application from the app store. For instance, an application could lock the device with just a click of a button as opposed to using the physical power button.

Because it is a third-party application, the user must have confidence in the application before installing using it to lock a device. It may pose a security risk if it’s a malicious application.

The third-party application will require administrator permissions to your device, giving it full access to the device’s system-level security protocols.

To make sure the app is safe, install an antivirus on your smartphone to scan the app when installed. Also be sure to review user comments and overall rating given by the community on the app store before making a decision.

What is a Device Administrator feature?

The Device Administrator built-in security feature provides system-level access to specific third-party applications by giving them the rights to activate security protocols.

It also provides permissions to allow applications to perform specific tasks remotely.

  • Setting up a screen lock: requiring the user to unlock their smartphone by entering a PIN or a screen lock or a password or using biometrics.
  • Find My Phone: This feature helps the user find the phone when it is lost or stolen. For this to work, the phone needs to have a working GPS.
  • Remote Lock: This feature helps in locking the device remotely from another trusted device around you.
  • Reset Device: In critical situations where very little risk is acceptable, as a last resort you have the permission to remotely wipe out the device entirely and reset it to factory settings, removing all data. E.g. if your device has been stolen..

How can I find the hidden device administrator in Android?

To see a list of all the applications that have been granted the admin rights, follow the below steps:

  1. Go to Settings > Security.

  1. Tap “Other security settings.”

  1. Tap “Device admin apps.”

Here you can see all the apps, including hidden apps that might not appear in your app drawer.

If you see any suspicious application listed and not showing up in your app drawer, disable access by clicking the toggle to the right of the application.

Now to delete this hidden application, follow the steps below:

  1. Go to Settings > Apps

  1. Locate the hidden application, then click on it

  1. Tap Uninstall

How to enable Screen Lock Service?

If you are using the built-in services, enabling the Screen lock service is not required as that is enabled by default. For built-in locks, the service is not even listed in the device administrator.

That said, if you plan on using a third-party app to get more variants of screen locks and features, then for these you will be required to grant them the lock screen service.

For example, let’s take the “Lock Screen” app from the App Store by “olalab”, as it has an excellent rating of 4 out of 5 on Google Play Store and a good amount of positive reviews and passes an antivirus scan.

After installing, a user is asked to provide administrator rights to the app when opening the application. Follow the below steps to do that:

  1. Open Settings > Security
  1. Tap “Other security settings.”
  1. Tap “Device admin apps.”
  1. Tap the switch in front of the “Grant Lock Screen” and click “Activate.”

  1. Now go back to Settings, tap “Accessibility.”
  1. Tap “installed services.”

  1. Toggle “Lock Screen” to ON
  1. On getting a prompt for confirmation, click “Allow.”

Now the lock screen service is enabled for the app.

Why disable Lock Screen Service?

You might want to disable lock screen service to prevent granting dangerous permissions to unsafe third-party apps you plan to install.

When given admin permissions, third-party apps get system-level control, granting them almost every permission. Some apps available on the App Store, while disguised as genuine, may be malicious and pose a significant threat to the device.

They are now capable of:

  • Erasing all the data on the device.
  • Read passwords saved on the device.
  • Fetching stored banking information.

Follow the steps below to disable the lock screen service:

  1. Open Settings > Security
  1. Tap “Other security settings.”
  1. Tap “Device admin apps.”
  1. Tap the switch in front of the “Grant Lock Screen” and click “Deactivate.”

  1. Now go back to Settings, tap “Accessibility.”
  1. Tap “installed services.”
  1. Toggle “Lock Screen” to OFF

  1. On getting a prompt for confirmation, click “Allow.”

Why can’t I turn off my lock screen?

You might encounter a situation where few lock types under your lock screen service settings are disabled.

The above screenshot shows that two options, “None” and “Swipe,” are disabled.

There might be several reasons why you might see such a behavior:

  1. Device Administration for Screen Lock Service might be disabled or deactivated. To enable then, follow the below steps:
    1. Go to “Settings > Security.”
    2. Tap on “Device Administration.”
    3. And toggle the check after Screen Lock Service.
  1. You may be trying to install a third-party app to enforce the screen lock service and may have also given the device administrator rights to that app. Because being a third-party app, when you provide administrator rights to it, your phone assigns a higher priority to that third-party app, which lowers the priority of the existing lock service settings.
    • To solve this, you may uninstall the third-party app that is causing this issue.
  2. Enabling the biometrics lock feature can disable a few other lock types from the settings in a few smartphones. Try disabling the biometric lock if set any.

Why is my screen lock disabled by the administrator?

Often you might see “Disabled by administrator, encryption policy, or credential storage.” below a screen lock type.

This occurs mainly because of three reasons:

  1. The third-party apps that have administrator privileges on your device may be stopping you from editing these settings.
  2. Another reason could be the encryption policy. When you enable the encryption policy on your device, it prevents the user from changing the screen lock type according to the policy. To overcome this, follow the steps below to disable the encryption policy:
    1. Open your phone’s settings.
    2. Browser over to “Security > Encryption.”
    3. Then tap “Decrypt Device.”

  1. If you also have an SD card installed, click “Decrypt SD Card” under the same settings tab.

  1. Now the screen lock should be enabled.
  2. Often credentials stored on your phone might have corrupted or may expire. To fix this:
    1. Go to “Settings > Security.”
    2. Locate and tap the “Credentials > Advanced” button.
    3. Then tap the “Clear credentials button.”

  1. You might get a confirmation box, click “ok”, which should fix the credential issue for the screen lock service.

How do I remove the screen lock on my Samsung phone?

To remove the screen lock from a Samsung Android phone, follow the below steps:

  1. Tap the Apps icon.
  2. Tap Settings & go to Lock screen and security.
  3. Tap Screen lock type.

  1. Select the last option labeled as “None.”

The screen lock should be removed now from the Samsung phone.

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