A free app for Android, by Fledgling Developers.
The camera is one of the most essential components of a smartphone, but many people forget to disable it when they don't need it. This is a very important security measure because it allows an attacker to use your phone's camera to take a picture of your credentials and use them to hack your account.
If you suspect that your phone is being used to take photos, you can disable the camera in the device settings.
This app will also allow you to disable the camera in the device settings, so you don't need to uninstall the app if you don't want to use it.