I am using the following code to take a picture and upload. During this process, I will need a thumbnail for preview. I am using androidx.activity:activity-ktx:1.2.0-alpha03 and androidx.fragment:fragment-ktx:1.3.0-alpha03, tested on Pixel 2 Xl API 29 on emulator.

The code in invoked by a view, which is owned by a fragment(caller), which is owned by an activity

private val getImageFromCamera =
    caller.prepareCall(ActivityResultContracts.TakePicture()) { bitmap: Bitmap? ->
        bitmap?.run {
            postPhotoPreview!!.setImageBitmap(this)
        }
        if (bitmap == null) {
            Timber.i("didn't get thumbnail")
        }
    }

val timeStamp: String = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())

val relativeLocation =
    Environment.DIRECTORY_PICTURES + File.separator + "MyApp"
val name = "MyApp_$timeStamp"
val ext = "jpg"
try {
    val newImageDetails = ContentValues()
    newImageDetails.put(MediaStore.MediaColumns.DISPLAY_NAME, "$name.$ext")
    newImageDetails.put(MediaStore.MediaColumns.MIME_TYPE, "image/$ext")
    newImageDetails.put(MediaStore.MediaColumns.RELATIVE_PATH, relativeLocation)
    val contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
    val uri = caller.requireActivity().contentResolver.insert(contentUri, newImageDetails)
    Timber.i("created uri: $uri")
    getImageFromCamera(uri)
} catch (e: Exception) {
    Timber.e(e, "failed to take a picture ")
}

The current result is that ActivityResultContracts.TakePicture() always return null, but images are correctly saved into the provided uri... I also found out that intent doesn't seem to have any extras when it returns.

Please let me know if you need any information. Thanks in advanced!