TextRecognitionViewModel+TextRecognizer.kt

// TextRecognitionViewModel
fun analyzeStream() {
    if (isCameraStarted)
        textRecognizer.analyzeStream {
            it.forEach { _, value ->
                Timber.d("stringValue is ${value?.stringValue}")
                outputLiveData.postValue(value?.stringValue)

                value?.contents?.forEachIndexed { index, element ->
                     Timber.d("[$index] is ${element.stringValue}")
                }
            }
            Timber.d("itemList is $it")
        }
}

// TextRecognizer
fun analyzeStream(onSuccess: (SparseArray<MLText.Block?>) -> Unit) {
    ocrDetectorProcessor.resultAction = onSuccess
}