QuickCamera is a free and open source application that lets you quickly launch the camera app (normally or from the lock screen) with a simple gesture that involves twisting your wrist twice, quickly. It's the same gesture that's used to launch the camera app on the Moto X. Pull out your phone, perform the gesture and the camera app will be ready to take wonderful photos. No need to wake the phone or press any buttons.
**IMPORTANT NOTE**: You need to have Google Camera installed on your phone in order to launch the camera from lockscreen. If Google Camera is not installed on your phone, then camera might not launch from the lockscreen. I dont know why this happens, but I am looking into it at the moment.
I know many of you are having issues with battery usage and since this app is only in beta stage, some battery drain is acceptable. The app offers many options for battery saving in Settings, so please use that.
android.permission.WAKE_LOCK: Required to prevent the service from shutting down after long periods of time
android.permission.CAMERA: Required to verify if the camera app is already running or not, to prevent crashing
android.permission.VIBRATE: Required to vibrate the phone when camera launches
android.permission.RECEIVE_BOOT_COMPLETED: Required to start the service on startup
android.permission.READ_PHONE_STATE: Required to pause gesture recognition during calls, to prevent accidental launches and reduce battery usage