How do I notified when camera is used or opened by any other application

Question

I want to get notified whenever any other application opened or accessed camera. I already know that I can check Camera.open() and its exception. but for that I have to check every time using service but it drain battery so I want whenever opened camera just notified me and get its package name. I already read these.

How to find whether the camera is in use?

How to check if camera is opened by any application

Answer 1

You can do it using callbacks provided by the API of Camera2.

In your CameraManagerobject you can attach a CameraManager.AvailabilityCallback which will notice you when the camera object is being used or not.

About AvailabilityCallback:

A callback for camera devices becoming available or unavailable to open.

Cameras become available when they are no longer in use, or when a new removable camera is connected. They become unavailable when some application or service starts using a camera, or when a removable camera is disconnected.

You can research more information about it in the official documentation