How to setImageCaptureResolutionSelector() in CameraController?

Question

How do I set resolution, setImageCaptureResolutionSelector()? I am using CameraController but getting very confused between its documentation and ProcessCameraProvider documentation. Here is my code:

     val controller = remember {
            LifecycleCameraController(applicationContext).apply {
                setEnabledUseCases(CameraController.IMAGE_CAPTURE or CameraController.VIDEO_CAPTURE)
                setImageCaptureMode(CAPTURE_MODE_MAXIMIZE_QUALITY)
                //setImageCaptureResolutionSelector() // is this where it goes? what value gets passed to it? - struggling to find examples.
            }
        }

I've seen that there is a ResolutionStrategy.HIGHEST_AVAILABLE_STRATEGY which allows defaulting to the highest camera resolution. How do I use this? Should I be doing something like this and if so how do I apply it?

ResolutionSelector.Builder().setResolutionStrategy(ResolutionStrategy.HIGHEST_AVAILABLE_STRATEGY).build()

*** UPDATE ***

This functions without errors:

        val resolutionSelector = ResolutionSelector.Builder().setResolutionStrategy(ResolutionStrategy.HIGHEST_AVAILABLE_STRATEGY).build()

        val controller = remember {
            LifecycleCameraController(applicationContext).apply {
                setEnabledUseCases(CameraController.IMAGE_CAPTURE or CameraController.VIDEO_CAPTURE)
                setImageCaptureMode(CAPTURE_MODE_MAXIMIZE_QUALITY)
                setImageCaptureResolutionSelector(resolutionSelector)
            }
        }

When I query the ResolutionSelector like so:

        val res = controller.getImageCaptureResolutionSelector()
        Log.w("Resolution", "*** RESOLUTION ***: " + res.toString())

I get:

*** RESOLUTION ***: androidx.camera.core.resolutionselector.ResolutionSelector@7b11fc9

...no details about what resolution has been set and the resolution is not changing in any way - the images created are 1088x1440 (my camera goes to 3120x4160). Why is this not working?

Answer 1

This is how I resolved the issue:

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        if(!hasRequiredPermissions()) {
            ActivityCompat.requestPermissions(
                this, CAMERAX_PERMISSIONS, 0
            )
        }

        setContent {
            CameraApp1Theme {
                val scope = rememberCoroutineScope()
                val scaffoldState = rememberBottomSheetScaffoldState()

                // set a size variable
                val screenSize = Size(3120, 4160)
                
                // build a resolutionselector using that size
                val resolutionSelector = ResolutionSelector.Builder().setResolutionStrategy(ResolutionStrategy(screenSize, ResolutionStrategy.FALLBACK_RULE_CLOSEST_HIGHER_THEN_LOWER)).build()

                val controller = remember {
                    LifecycleCameraController(applicationContext).apply {
                        // The 'or' here seemed to be the issue
                        //setEnabledUseCases(CameraController.IMAGE_CAPTURE or CameraController.VIDEO_CAPTURE)
                        setEnabledUseCases(CameraController.IMAGE_CAPTURE)
                        setImageCaptureMode(CAPTURE_MODE_MAXIMIZE_QUALITY)
                        setImageCaptureResolutionSelector(resolutionSelector)
                    }
                }

             }
        }
    }
}

The 'or' and setting two enabled use cases at the same time seemed to be the issue. I have seem comments on forums that setting both at once can sometimes not work and there is a workaround to set one and then another if you need image and video. I don't at the moment so I just set mine to image.

EDIT: I've blocked out where I've put the code in the mainactivity class. This should clarify where you need to add it to your own project.