The lock screen module was not tested in the security context and has no formal security requirements. This means that no security controls were applied to the lock screen code. As a result, it does not matter what security controls are used on the main system, these can easily be bypassed by attackers who want to access the device.
Most importantly, the lock screen code is not covered by any formal software inspection. This means that the lock screen module has no formal requirements and specifications for how it must be designed and architected. This lack of any design or architectural standards means that any developer can edit the source code of the lock screen, change the functions of the application, or add new features.
How to Hide an Android Device From View
If you want to hide your phone or tablet from view, you can use the Lock Screen functionality. To do this, first tap on the settings icon at the top-left corner of your screen (three dots). Then, select "Lock Screen" and choose a photo that you'd like to use as a background image.
Another option is to use a photo that's preinstalled on your device. Tap on the settings icon and scroll down until you find "Screen Lock Type." Then choose "Pattern," then follow steps 3-6 for creating a pattern.
The other option is to use the PIN number or password that you set up with your device. That's it!