A fast way to launch the Camera on Android!
Double tap Phone Power Button to switch Camera On.
Double tap Phone Power button again switch Camera Off.
To avoid accidental launch of Camera, we added Accelerometer or/and Proximity sensors tracking.
With this option enabled you should keep your phone in horizontal or vertical position while double pressing Power Button. ALso you can cover with finger the Proximity sensor while double pressing Power Button.
You can also manually disable persistent notification, as it is initially is visible due to Android requirements.
NB. Don't forget to select your Camera App in settings first!