Add basic Camera sample

[JolandaVerhoef]

No description provided.

[temcguir]

Some changes to make in order to get it working with the current CoroutineLifecycleOwner code. I'll take another pass to get it working without CoroutineLifecycleOwner.

[temcguir]

ViewModel should be retrieved via androidx.lifecycle.viewmodel.compose.viewModel. Something like:

@Composable
fun CameraPreviewScreen(
    modifier: Modifier = Modifier,
    viewModel: CameraPreviewViewModel = viewModel()
) {
    val surfaceRequest by viewModel.surfaceRequest.collectAsStateWithLifecycle()

[temcguir]

We can just pass the context to the camera here instead of through the ViewModel constructor. This is to align with the advice from https://developer.android.com/topic/architecture/recommendations#viewmodel where it says not to use AndroidViewModel. Though I wonder if there is still a better way to pass the context in.

    val context = LocalContext.current
    LifecycleStartEffect(Unit) {
        viewModel.startCamera(context)
        onStopOrDispose {
            viewModel.stopCamera()
        }
    }

[MagicalMeghan]

Take picture doesn't compile without parameters passed in

[JolandaVerhoef]

Can't reproduce on my side. Code works well both with camerax-compose alpha02 and alpha06

[temcguir]

This is an extension function, so make sure you import androidx.camera.core.takePicture.