This application simply locks the device's camera out for other applications. No application can use the camera unless the CameraLock is disabled. It is designed for people who worry about their privacy or need anti spy app. If you are concerned that the rumours that apps like youtube or facebook can spy on you are true, it is for you. It is also perfect solution if you worry that someone installed a spy camera program on your device or if you got your device damaged and it keeps on turning the camera on. You can lock or unlock the camera from the notification bar or from the application itself. No significant battery drain was noticed.
This application needs permission for the network connection only for the use of advertisements - if you are worried about that download the paid version here: https://play.google.com/store/apps/details?id=piozabor.android.cameralockpro - it has no ads so doesn't need the network.
Note: the app locks the camera, so some other applications may crash when CameraLock is enabled. It is also my first app so any comments are appreciated.