How to use CameraX in foreground service?

[Kursad Laçin]

I need to use the Camera frames even the app is in background. After I have searched how to do it I encountered to foreground service. However, when the app is in background, the streaming from the Camera stops, so I cannot use the advantage of using foreground service.

    Camera                                       State                 

    -------------------------------------------------------------------

    Camera@dbfb30d[id=0]                         UNKNOWN               

    Camera@61d8d28[id=2]                         UNKNOWN               

    Camera@d99af2f[id=1]                         CLOSED

Whenever I touch the home button, the warning above comes to Log-cat and stop delivering frames to ImageAnalysis. I cannot process the frames.

All the CameraX dependencies is in a class which inherit from Service.

ps : manifest has been edited as android:foregroundServiceType="camera"

[Eino-Ville Talvala]

Hi Kursad -

Are you using a https://developer.android.com/reference/androidx/lifecycle/LifecycleService with ProcessCameraProvider#bindToLifecycle ?  That said, I'm not sure if foreground service usage is officially supported or not right now.

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[Kursad Laçin]

Hi again, 

I was getting the context from the main activity and it was working with Foreground service until I press to home button. After I implemented LifecycleOwner to the service, I cannot get the Camera frames even the app is open.

Here is my code: can you investigate and tell me what is wrong?

https://github.com/krsad/cameraxAsForegroundService/blob/main/CameraXAsForegroundService

There is no error, however these are from the Logcat. 

D/CameraRepository: Added camera: 0

I/Camera2CameraInfo: Device Level: INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED

I/CameraManagerGlobal: postSingleUpdate device: camera id 0 status STATUS_PRESENT

I/CameraManagerGlobal: postSingleUpdate device: camera id 1 status STATUS_PRESENT

D/UseCaseAttachState: Active and attached use case: [] for camera: 0

I/CameraManagerGlobal: postSingleUpdate device: camera id 2 status STATUS_PRESENT

D/CameraRepository: Added camera: 1

I/Camera2CameraInfo: Device Level: INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED

I/CameraManagerGlobal: postSingleUpdate device: camera id 0 status STATUS_PRESENT

I/CameraManagerGlobal: postSingleUpdate device: camera id 1 status STATUS_PRESENT

I/CameraManagerGlobal: postSingleUpdate device: camera id 2 status STATUS_PRESENT

D/CameraRepository: Added camera: 2

D/UseCaseAttachState: Active and attached use case: [] for camera: 1

I/Camera2CameraInfo: Device Level: INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED

I/CameraManagerGlobal: postSingleUpdate device: camera id 0 status STATUS_PRESENT

I/CameraManagerGlobal: postSingleUpdate device: camera id 1 status STATUS_PRESENT

I/CameraManagerGlobal: postSingleUpdate device: camera id 2 status STATUS_PRESENT

D/UseCaseAttachState: Active and attached use case: [] for camera: 2

D/CameraOrientationUtil: getRelativeImageRotation: destRotationDegrees=0, sourceRotationDegrees=270, isOppositeFacing=false, result=270

D/DeferrableSurface: Surface created[total_surfaces=1, used_surfaces=0](androidx.camera.core.impl.ImmediateSurface@2797ba5}

D/Camera2CameraImpl: {Camera@50536c5[id=1]} Use case ImageAnalysis:androidx.camera.core.ImageAnalysis-bea87099-87f4-434d-9ba7-90571f6c862f ACTIVE

[Zoran Smilevski]

It should work. Try to switch to LifecycleService ( implementation "androidx.lifecycle:lifecycle-service:$lifecycle_version"). Maybe your implementation is missing something.

[Kursad Laçin]

Thanks for your advice. I was using (" extends Service implements LifecycleOwner" ) before. I changed it to ("extends LifecycleService"). So it totally worked. 

Thank you very much!!