I want to write application on Android that starts in background when user launches a built-in camera (it is important: build-in camera, not an application) and do some actions after user makes a photo.
Is it real? If yes, how to implement this?
I want to write application on Android that starts in background when user launches
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I doubt if this is possible. There is no mechanism which android provides that causes a broadcast to the system that Camera has been launched. Plus, you cannot modify the contents shown on the screen as the Camera application is in command. The only way out is to have a MediaScanner and FileObserver to check when a new picture is created in DCIM/Camera/ folder and make your app act accordingly