In today's digital world, a smartphone stores more personal information than any physical safe. Messengers with correspondence, bank clients with payment history and galleries with personal photos - all this becomes available to anyone who simply picks up your unlocked phone. A standard screen lock, be it a pattern or a fingerprint, protects the device from strangers when the display is off, but leaves data vulnerable when you use the gadget.
That's why the feature block individual applications becomes critical to ensuring digital hygiene. It allows you to create an additional layer of defense by requiring identity verification before launching a specific app. This is especially true if you give the phone to your children to play with or to colleagues to call, but do not want them to see the contents of your instant messengers or financial instruments.
Fortunately, Android developers and third-party security studios offer many ways to implement this protection. From built-in system utilities in the MIUI and One UI shells to universal locker applications available on Google Play. In this guide, we will analyze in detail all the available methods, their advantages and disadvantages, as well as the specifics of setting up on different versions of the operating system.
Built-in security features in popular shells
Many smartphone manufacturers understand the importance of privacy and implement the application blocking function directly at the system level. This is the most reliable option, since it does not require the installation of third-party software and is deeply integrated into the operation of the device. However, the presence and location of these settings highly depend on the brand and firmware version.
For example, owners of devices Xiaomi, Redmi i Poco with the MIUI or HyperOS shell have access to the powerful “Application Protection” tool. To activate it, you need to go to the Settings → Applications → Application protectionsection. Here the system will offer to set a separate password or use biometrics specifically for selected apps. A feature of this implementation is the ability to hide the application itself from the menu after blocking.
Users of smartphones Samsung with the One UI shell can use the “Knox Folder” (Secure Folder) function. This is not just blocking, but creating an isolated space. Applications moved to this folder exist there as separate copies with their own data and require additional authentication to log in. This solution is considered one of the most secure on the mobile OS market thanks to the use of the Knox platform.
⚠️ Attention: Shell interfaces may change with updates. If you do not find the “Protection of applications” item in the specified places, use the search in the settings by entering the query “blocking” or “protection”.
Devices from Huawei i Honor also offer the "Applocking" function, accessible through the menu Settings → Security → Application blocking. After setting the master password, you will be able to select a list of apps to which access will be limited. However, on some global firmware versions this function may not be available due to regional restrictions.
Using specialized locker applications
If your smartphone runs on “pure” Android or the stock firmware does not have the required function, applications from the Google Play store will come to the rescue. The market offers dozens of solutions, from simple blockers to complex security systems. Choosing the right tool depends on your needs for functionality and the level of trust in the developer.
Popular solutions, such as AppLock ot DoMobile Lab or Norton App Lock, work on the principle of overlaying on top of other windows. After installing such an application, you grant it the necessary permissions, select apps to protect and set the authentication method. An important advantage of third-party lockers is that they are cross-platform - they work on almost any device running Android 5.0 and higher.
When choosing a locker application, you should pay attention to the presence of the “False Password” function. This option allows you to specify a second, dummy code that opens a set of pre-selected “safe” applications. If you are forced to unlock your phone, you enter a false code and display a harmless set of apps, hiding the real content.
- 🔒 Data encryption: Some advanced lockers not only close the entrance, but also encrypt the application cache, making it impossible to view notifications or previews without entering a password.
- 📸 Shooting an intruder: The function of automatic photographing after several unsuccessful attempts to enter a password helps to identify who tried to access your data.
- 🎭 Icon masking: The ability to hide the icon of the locker application itself or disguise it as a calculator or voice recorder for additional privacy.
When installing a third-party locker, be sure to give it permission to “On top of other windows” and access to “Usage history”, otherwise the lock will not work correctly.
Setting up the “Screen Pinning” function
For situations when you hand over the phone to another person for a short time (for example, to show a photo or dial a number), completely blocking each application may be redundant. In such cases, Android's built-in feature called Screen Pinning is ideal. It does not set a launch password, but does not allow the user to exit a specific application.
This function is activated in the menu Settings → Security → Advanced → Screen pinning. Once enabled, you can “pin” any open application. While the screen is pinned, the navigation buttons, home gestures, and task switching gestures do not work. Exiting the mode is possible only with a combination of buttons, which will require entering a PIN code, pattern key or password for the main unlocking of the device.
This method is especially convenient for parents who control their children’s time on the tablet, or for demonstrating content at a presentation. It ensures that a person cannot accidentally or intentionally go to another section of the system, check notifications or open settings.
⚠️ Attention: Screen pinning does not protect data inside an application unless the application itself is locked. It only prevents you from exiting the app. Use this method for temporary access only.
To disable pinning, a combination is usually used: the “Back” button and the “Browse” button (square) at the same time, or swipe up from the bottom while holding your finger, depending on the type of navigation. The system will immediately ask for your credentials, confirming that only the owner of the device can remove the restriction.
Protection through privacy settings and biometrics
With the release of new versions of Android, starting with 10 and especially in 12, 13 and 14, Google is introducing native privacy management tools that indirectly help in protecting applications. Although there may not be a direct “application password” function in stock, the use of biometric authentication within the services themselves is becoming a standard.
Many modern applications, especially banking (Sberbank, Tinkoff, Alpha) and instant messengers (Telegram, WhatsApp), have built-in security settings. You can enable them to require a fingerprint or Face ID every time you launch them. This is implemented through the section Settings → Privacy → Fingerprint blocking inside the application itself.
This approach is the most preferable from a security point of view, since the encryption keys are stored in the device’s secure storage (Trusted Execution Environment). Even if an attacker bypasses the system locker, he will not be able to enter the application without biometrics tied to a specific account.
What to do if the fingerprint scanner does not work?
If the biometrics does not recognize you, the system will prompt you to enter the backup PIN code or pattern that you specified when you initially set up the screen lock. Make sure you remember this code.
In addition, Android 13 and later introduced the ability to restrict app access to the clipboard and camera. While this does not block login, it does prevent data copied from protected applications from leaking to other apps. A comprehensive approach to setting permissions creates an environment where access to data is controlled at multiple levels.
Comparison of blocking methods: effectiveness table
To help you choose the optimal security method, we have prepared a comparison table. It examines key parameters: security level, impact on the battery, complexity of setup and reliability of reset protection.
| Protection method | Security level | Impact on battery | Difficulty of setup | Bypass risk |
|---|---|---|---|---|
| Built-in protection (MIUI/One UI) | High | Minimum | Low | Low |
| Third-party AppLock | Medium | Medium (background work) | Medium | Medium (can be deleted in safe mode) |
| Screen pinning | Low (output only) | None | Low | High (reboot unlocks) |
| Internal protection applications | Very high | Minimum | Medium (setting in each application) | Minimum |
As can be seen from the table, built-in solutions and internal protection of the applications themselves are the most reliable. Third-party lockers are convenient due to their versatility, but they consume more system resources because they constantly hang in memory, monitoring the launch of other apps. Screen pinning is a situational tool, not a means of permanent protection.
The combination of built-in system locking and internal protection of critical applications (bank, instant messenger) provides the maximum level of security for your data.
Common problems and ways to solve them
In the process of setting up locking, users may encounter a number of technical difficulties. Understanding the causes of these problems will help you quickly eliminate them and not be left without access to your own data. Most often, difficulties are associated with aggressive energy saving or permission conflicts.
One of the common problems is that the lock does not work when exiting sleep mode. This happens because the Android system kills the locker process to save battery. To fix this, you need to go to Settings → Applications → [Your Locker] → Battery and select the “No restrictions” or “Do not limit” mode. This will allow the application to run in the background constantly.
Another situation is accidentally blocking yourself. If you've forgotten your built-in security or locker app password, the recovery process can be complicated. In the case of built-in Xiaomi or Samsung functions, you often need to log into your Mi Account or Samsung Account to reset the password. For third-party applications, a link to email is usually provided.
- 🔄 Update conflict: After a major Android update, permissions may be reset. Check whether the locker is granted access to “Accessibility”, as many of them use this service to intercept clicks.
- 🛡️ Antivirus protection: Some antiviruses may block the operation of lockers, considering them suspicious. Add the defender application to the exceptions of your antivirus.
- 📵 Do not disturb mode: Make sure that the blocking does not conflict with focus modes, which may hide notifications about hacking attempts.
⚠️ Attention: Never install two different locker applications at the same time. They will compete for the right to intercept the startup, which will lead to a system freeze or an endless loop asking for a password.
If you are using developer mode or an unlocked bootloader, some system security features may be disabled by the manufacturer for security purposes. In such cases, relying on third-party solutions becomes the only option, but their effectiveness may be reduced.
☑️ Diagnosing a locking problem
Frequently asked questions (FAQ)
Can I set a password to install new applications?
Yes, many shells (for example, MIUI) allow you to set a password for installing and uninstalling applications. This is located in the same "Application Protection" settings. In stock Android, this can be implemented through the Google Play settings, which require authentication for purchases and installations.
What happens if I delete a locker application?
If you delete a third-party locker, the protection from all applications will be instantly removed. However, the data itself inside the applications (correspondence, photos) will not be affected. In the case of built-in system protection, you cannot remove it; you can only disable the function in the settings.
Does blocking applications affect the operation of notifications?
Depends on the settings. Most lockers allow you to choose a mode: hide the contents of the notification on the locked screen or show only the title. This is configured in the privacy settings of the locker itself.
Is it safe to enter a bank password into a third-party AppLock?
It is better not to use third-party lockers to enter passwords. There is a risk of keyloggers (click interceptors) in free applications. For banking applications, always use their built-in fingerprint or Face ID protection.
How to hide the icon of a blocked application?
This function is not available in all lockers. Built-in tools from Xiaomi and some other brands allow you to hide icons completely, making them accessible only through a special set of numbers in the dialer. Third-party applications often require the purchase of a Pro version for this function.