Develop Reference

Cannot access class 'com.google.common.util.concurrent.ListenableFuture'. Check your module classpath for missing or conflicting dependencies

I am trying to integrate CameraX in my flutter app but I get error saying Cannot access class 'com.google.common.util.concurrent.ListenableFuture'. Check your module classpath for missing or conflicting dependencies
There error comes from below line
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
Below is my native view
class CealScanQrView(val context: Context, id: Int, creationParams: Map<String?, Any?>?) :
PlatformView {
private var mCameraProvider: ProcessCameraProvider? = null
private var preview: PreviewView
private var linearLayout: LinearLayout = LinearLayout(context)
private lateinit var cameraExecutor: ExecutorService
private lateinit var options: BarcodeScannerOptions
private lateinit var scanner: BarcodeScanner
private var analysisUseCase: ImageAnalysis = ImageAnalysis.Builder()
.build()
companion object {
private val REQUIRED_PERMISSIONS = mutableListOf(Manifest.permission.CAMERA).toTypedArray()
}
init {
val linearLayoutParams = ViewGroup.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT
)
linearLayout.layoutParams = linearLayoutParams
linearLayout.orientation = LinearLayout.VERTICAL
preview = PreviewView(context)
preview.layoutParams = ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT
)
linearLayout.addView(preview)
setUpCamera()
}
private fun setUpCamera(){
if (allPermissionsGranted()) {
startCamera()
}
cameraExecutor = Executors.newSingleThreadExecutor()
options = BarcodeScannerOptions.Builder()
.setBarcodeFormats(
Barcode.FORMAT_QR_CODE)
.build()
scanner = BarcodeScanning.getClient(options)
analysisUseCase.setAnalyzer(
// newSingleThreadExecutor() will let us perform analysis on a single worker thread
Executors.newSingleThreadExecutor()
) { imageProxy ->
processImageProxy(scanner, imageProxy)
}
}
override fun getView(): View {
return linearLayout
}
override fun dispose() {
cameraExecutor.shutdown()
}
#SuppressLint("UnsafeOptInUsageError")
private fun processImageProxy(
barcodeScanner: BarcodeScanner,
imageProxy: ImageProxy
) {
imageProxy.image?.let { image ->
val inputImage =
InputImage.fromMediaImage(
image,
imageProxy.imageInfo.rotationDegrees
)
barcodeScanner.process(inputImage)
.addOnSuccessListener { barcodeList ->
val barcode = barcodeList.getOrNull(0)
// `rawValue` is the decoded value of the barcode
barcode?.rawValue?.let { value ->
mCameraProvider?.unbindAll()
}
}
.addOnFailureListener {
// This failure will happen if the barcode scanning model
// fails to download from Google Play Services
}
.addOnCompleteListener {
// When the image is from CameraX analysis use case, must
// call image.close() on received images when finished
// using them. Otherwise, new images may not be received
// or the camera may stall.
imageProxy.image?.close()
imageProxy.close()
}
}
}
private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
ContextCompat.checkSelfPermission(context, it) == PackageManager.PERMISSION_GRANTED
}
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
cameraProviderFuture.addListener({
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
mCameraProvider = cameraProvider
// Preview
val surfacePreview = Preview.Builder()
.build()
.also {
it.setSurfaceProvider(preview.surfaceProvider)
}
// Select back camera as a default
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()
// Bind use cases to camera
cameraProvider.bindToLifecycle(
(context as FlutterActivity),
cameraSelector,
surfacePreview,
analysisUseCase,
)
} catch (exc: Exception) {
// Do nothing on exception
}
}, ContextCompat.getMainExecutor(context))
}
}
class CealScanQrViewFactory : PlatformViewFactory(StandardMessageCodec.INSTANCE) {
override fun create(context: Context, viewId: Int, args: Any?): PlatformView {
val creationParams = args as Map<String?, Any?>?
return CealScanQrView(context, viewId, creationParams)
}
}

Add this line to your app build.gradle dependencies:
implementation 'com.google.guava:guava:29.0-android'

Displaying an image from internal storage from android phone with Kotlin

I have made a very simple app to take a picture using camera x, with a viewfinder and it displays the image taken in the same activity
I am trying to get all the images taken from the internal storage and display them in another activity in the app with a recycler view
Im fine with recycler views, and I can use one with external Api's to display images and data but I just cannot figure out how to get the images from the internal storage, and add them to a list to display in the recycler view, Ive tried checking documentation but im getting nowhere, all I need is a simple code which will allow me to display the images as a thumbnail
class MainActivity : AppCompatActivity() {
private var imageCapture: ImageCapture? = null
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
private val TAG = "Snap"
private val FILENAME_FORMAT = "yyyy-MM-dd-HH-mm-ss-SSS"
private val REQUEST_CODE_PERMISSIONS = 10
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
btnSnap.setOnClickListener {
takePhoto()
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) ==
PackageManager.PERMISSION_GRANTED
) {
startCamera()
} else {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.CAMERA), REQUEST_CODE_PERMISSIONS
)
}
outputDirectory = getOutputDirectory()
cameraExecutor = Executors.newSingleThreadExecutor()
}
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<String>, grantResults: IntArray ) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) ==
PackageManager.PERMISSION_GRANTED) {
startCamera()
} else {
Toast.makeText(this, "Permissions not granted by the user",
Toast.LENGTH_SHORT).show()
finish()
}
}
private fun startCamera() {
val cameraProviderFuture = getInstance(this)
//add listener to the ProcessCameraProvider
cameraProviderFuture.addListener(Runnable {
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
val preview = Preview.Builder().build().also {
it.setSurfaceProvider(viewFinder.createSurfaceProvider())}
imageCapture = ImageCapture.Builder().build()
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
try {
//unbind use cases before rebinding
cameraProvider.unbindAll()
cameraProvider.bindToLifecycle(this, cameraSelector, preview,
imageCapture)
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(this))
}
private fun takePhoto() { val imageCapture = imageCapture ?: return
val photoFile = File(outputDirectory, SimpleDateFormat(FILENAME_FORMAT,
Locale.UK).format(System.currentTimeMillis()) + ".jpg")
val outputOpts = ImageCapture.OutputFileOptions.Builder(photoFile).build()
imageCapture.takePicture(outputOpts,
ContextCompat.getMainExecutor(this), object :
ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
//save the photo to the file and display on screen
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
val savedUri = Uri.fromFile(photoFile)
imgSnap.setImageURI(savedUri)
}
})
}
private fun getOutputDirectory(): File {
val mediaDir = externalMediaDirs.firstOrNull()?.let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() }
}
return if (mediaDir != null && mediaDir.exists()) mediaDir else filesDir
}
}

You can check out this link that provides you the better overview about using RecyclerView..
And in your bind view holder method in your adapter you can use this code to get the images from the storage and show it into your recyclerview as thumbnail.
String path = Environment.getExternalStorageDirectory() + "/myImage.jpg";
Bitmap bitmap = BitmapFactory.decodeFile(path);
You can learn more about the getting the images from storage Link.

CameraX not able to capture a photo

I added the code from
https://developer.android.com/training/camerax
link
. The preview, permissions and everything else is working just fine, however I am not able to capture photo from the button. I declared the button to have a listener and connected the function takePhoto(), but it doesn't seem to work, in the past it works fine and I don't know if it's because of the new version of the CameraX feature is using, I don't know but it doesn't seem to be responding correctly. I have the Logcat open and when I press the button, it has the message that is pressed:
D/ViewRootImpl#70b5dc2[MainActivity]: ViewPostIme pointer 0
D/ViewRootImpl#70b5dc2[MainActivity]: ViewPostIme pointer 1
But that's it really, nothing else but that is my issue at the moment, it's a small issue but I believe I miss something to make this simple issue being resolved and I don't know what it causes to do so. Here is the codes that I will provide below:
Gradle:
plugins {
id 'com.android.application'
id 'kotlin-android'
}
android {
compileSdk 30
defaultConfig {
applicationId "com.example.camerax1"
minSdk 21
targetSdk 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.6.0'
implementation 'androidx.appcompat:appcompat:1.3.1'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
implementation 'androidx.camera:camera-camera2:1.1.0-alpha08'
implementation 'androidx.camera:camera-lifecycle:1.1.0-alpha08'
implementation 'androidx.camera:camera-view:1.0.0-alpha28'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
activity_main.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MainActivity">
<androidx.camera.view.PreviewView
android:id="#+id/previewView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<Button
android:id="#+id/captureButton"
android:layout_width="85dp"
android:layout_height="85dp"
android:layout_marginBottom="25dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:importantForAccessibility="no" />
</androidx.constraintlayout.widget.ConstraintLayout>
Full code in once class MainActivity.kt
class MainActivity : AppCompatActivity() {
private var imageCapture: ImageCapture? = null
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//Request camera permissions
if (allPermissions()) {
startCamera()
} else {
ActivityCompat.requestPermissions(this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS)
}
val captureBtn = findViewById<Button>(R.id.captureButton)
captureBtn.setOnClickListener {
takePhoto()
}
outputDirectory = getOutputDirectory()
cameraExecutor = Executors.newSingleThreadExecutor()
}
private fun takePhoto() {
Toast.makeText(baseContext, "Processing..", Toast.LENGTH_SHORT).show()
//Get a stable reference of the modifiable image capture use case
val imageCapture = imageCapture ?: return
//Create time-stamped output file to hold the image
val photoFile = File(
outputDirectory,
SimpleDateFormat(FILENAME_FORMAT, Locale.ENGLISH).format(System.currentTimeMillis()) + ".jpg")
//Create output options object which contains file + metadata
val outputOptions = ImageCapture.OutputFileOptions.Builder(photoFile).build()
//Set up image capture listener, which is triggered after photo has been taken
imageCapture.takePicture(
outputOptions, ContextCompat.getMainExecutor(this), object : ImageCapture.OnImageSavedCallback {
override fun onImageSaved(outputFileResults: ImageCapture.OutputFileResults) {
val savedUri = Uri.fromFile(photoFile)
val msg = "Photo capture succeeded: $savedUri"
Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
Log.d(TAG, msg)
}
override fun onError(exception: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exception.message}", exception)
}
}
)
}
private fun startCamera() {
val viewFiner = findViewById<PreviewView>(R.id.previewView)
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener({
//Used to bind the lifecycle of camera to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
//Preview
val preview = Preview.Builder().build().also {
it.setSurfaceProvider(viewFiner.surfaceProvider)
}
//Select back camera as a default
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
try {
//Unbind use cases before rebinding
cameraProvider.unbindAll()
//Bind use cases to camera
cameraProvider.bindToLifecycle(
this,
cameraSelector,
preview
)
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
Toast.makeText(this, "Use case binding failed: $exc", Toast.LENGTH_SHORT).show()
}
}, ContextCompat.getMainExecutor(this))
}
private fun allPermissions() = REQUIRED_PERMISSIONS.all {
ContextCompat.checkSelfPermission(baseContext, it) == PackageManager.PERMISSION_GRANTED
}
override fun onRequestPermissionsResult(
requestCode: Int,
permissions: Array<out String>,
grantResults: IntArray
) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults)
if (requestCode == REQUEST_CODE_PERMISSIONS) {
if (allPermissions()) {
startCamera()
} else {
Toast.makeText(this, "Permissions not granted by the user.", Toast.LENGTH_SHORT).show()
finish()
}
}
}
private fun getOutputDirectory(): File {
val mediaDir = externalMediaDirs.firstOrNull().let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() }
}
return if (mediaDir.exists())
mediaDir else filesDir
}
override fun onDestroy() {
super.onDestroy()
cameraExecutor.shutdown()
}
companion object {
private const val TAG = "CameraXBasic"
private const val FILENAME_FORMAT = "dd.MM.yyyy - HH:mm:ss"
private const val REQUEST_CODE_PERMISSIONS = 10
private val REQUIRED_PERMISSIONS = arrayOf(
Manifest.permission.CAMERA,
Manifest.permission.WRITE_EXTERNAL_STORAGE
)
}
}

Your code lacks binding the ImageCapture.Builder() to the camera Provider which is the prominent reason why it is not capturing Images. You need to bind imageCapture builder , it can be done in the following way . In your startCamera() function , you need to bind imageCapture in the following way :
private fun startCamera() {
val viewFiner = findViewById<PreviewView>(R.id.previewView)
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener({
//Used to bind the lifecycle of camera to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
//Preview
val preview = Preview.Builder().build().also {
it.setSurfaceProvider(viewFiner.surfaceProvider)
}
//set Image Capture Builder
imageCapture = ImageCapture.Builder()
.setCaptureMode(ImageCapture.CAPTURE_MODE_MINIMIZE_LATENCY)
.build()
//Select back camera as a default
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
try {
//Unbind use cases before rebinding
cameraProvider.unbindAll()
//Bind use cases to camera
//Add imageCapture to lifecycle
cameraProvider.bindToLifecycle(
this,
cameraSelector,
preview,
imageCapture
)
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
Toast.makeText(this, "Use case binding failed: $exc", Toast.LENGTH_SHORT).show()
}
}, ContextCompat.getMainExecutor(this))
}

CameraX black screen preview on some devices

I am using camerax to capture images in my android app.
Everything is working fine for me but some users are reporting black preview screen when using camerax activity.
But when users opens the app from recents app, the preview seems to work.
So, I think the issue might be with the lifecycle binding.
I am using
implementation "androidx.camera:camera-camera2:1.0.0-beta08"
Here is my code
<androidx.camera.view.PreviewView
android:id="#+id/viewFinder"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
private fun startCamera() {
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener({
cameraProvider = cameraProviderFuture.get()
val preview = Preview.Builder()
.build()
.also {
it.setSurfaceProvider(viewFinder.createSurfaceProvider())
}
imageCapture = ImageCapture.Builder()
.build()
val cameraSelector = CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build()
try {
cameraProvider.unbindAll()
cameraProvider.bindToLifecycle(this, cameraSelector, preview, imageCapture)
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(this))
}
private fun takePhoto() {
val imageCapture = imageCapture ?: return
val photoFile = File(
getExternalFilesDir("scantmp"),
SimpleDateFormat(FILENAME_FORMAT, Locale.US
).format(System.currentTimeMillis()) + ".png")
val outputOptions = ImageCapture
.OutputFileOptions
.Builder(photoFile)
.build()
imageCapture.takePicture(
outputOptions, ContextCompat.getMainExecutor(this), object : ImageCapture.OnImageSavedCallback {
override fun onError(exc: ImageCaptureException) {
Log.e(TAG, "Photo capture failed: ${exc.message}", exc)
}
override fun onImageSaved(output: ImageCapture.OutputFileResults) {
savedImageUri = Uri.fromFile(photoFile)
flash.visibility = View.GONE
closeCamera.visibility = View.GONE
takeAgain.visibility = View.VISIBLE
saveImage.visibility = View.VISIBLE
imgCapture.visibility = View.INVISIBLE
imageCaptured.setImageURI(Uri.fromFile(photoFile))
imageCaptured.visibility = View.VISIBLE
viewFinder.visibility = View.GONE
}
})
}

The above problem is solved in 1.0.0-beta11 update.
Try updating your library to latest version to solve this problem.

Can I record video with CameraX (Android Jetpack)?

Google has released the new CameraX library as part of Jetpack. It looks great for taking pictures, but my use case also require making video's. I tried googling for that, but couldn't find anything.
So, is it possible to record videos with the CameraX Jetpack library?

Yes, we can record video using CameraX. I have tried to implement myself with help of Github demo for CameraX. Please refer below code may it helps you.
Config for Video in CameraX:
val videoCaptureConfig = VideoCaptureConfig.Builder().apply {
setLensFacing(lensFacing)
setTargetAspectRatio(screenAspectRatio)
setTargetRotation(viewFinder.display.rotation)
}.build()
videoCapture = VideoCapture(videoCaptureConfig)
CameraX.bindToLifecycle(this, preview, imageCapture, videoCapture)
To Start video recording:
videoCapture?.startRecording(videoFile, object : VideoCapture.OnVideoSavedListener {
override fun onVideoSaved(file: File?) {
Log.i(javaClass.simpleName, "Video File : $file")
}
override fun onError(useCaseError: VideoCapture.UseCaseError?, message: String?, cause: Throwable?) {
Log.i(javaClass.simpleName, "Video Error: $message")
}
})
To Stop video recording:
videoCapture?.stopRecording()
Same above I have mentioned in Github issue comment: https://github.com/android/camera/issues/2#issuecomment-490773932
Notes: There may be different in code to implementation of video recording using CameraX. Because this above code was developed by me without any other reference rather than Github Demo.
Please check important comment of Oscar Wahltinez on this answer as of 14 May 2019

This is my solution
//Versions in Gradle
def camerax_version = "1.0.0-beta06"
def camera_extensions = "1.0.0-alpha13"
private lateinit var videoCapture: VideoCapture
private lateinit var viewFinder: PreviewView
private lateinit var outputDirectory: File
private var lensFacing: Int = CameraSelector.LENS_FACING_FRONT
private val executor = Executors.newSingleThreadExecutor()
private var isRecording = false
private var camera: Camera? = null
private lateinit var cameraProviderFuture: ListenableFuture<ProcessCameraProvider>
//onCreate
viewFinder = preview_video_view
runWithPermissions(*permissions) {
startCamera(view.context)
initClicks()
}
#SuppressLint("RestrictedApi", "UnsafeExperimentalUsageError")
private fun startCamera(context: Context) {
outputDirectory = getOutputDirectory(context)
cameraProviderFuture = ProcessCameraProvider.getInstance(context)
val cameraSelector = CameraSelector.Builder().requireLensFacing(lensFacing).build()
// Create a configuration object for the video use case
val videoCaptureConfig = VideoCaptureConfig.Builder().apply {
setTargetRotation(viewFinder.display.rotation)
setCameraSelector(cameraSelector)
}
//CameraX.initialize(context, this.cameraXConfig)
videoCapture = VideoCapture(videoCaptureConfig.useCaseConfig)
val preview: Preview = Preview.Builder().apply {
setTargetAspectRatio(AspectRatio.RATIO_16_9)
setTargetRotation(viewFinder.display.rotation)
}.build()
preview.setSurfaceProvider(viewFinder.createSurfaceProvider())
cameraProviderFuture.addListener(Runnable {
val cameraProvider = cameraProviderFuture.get()
camera = cameraProvider.bindToLifecycle(
viewLifecycleOwner,
cameraSelector,
preview,
videoCapture
)
}, ContextCompat.getMainExecutor(context))
}
#SuppressLint("RestrictedApi")
private fun startRecording() {
val file = createFile(
outputDirectory,
FILENAME,
VIDEO_EXTENSION
)
videoCapture.startRecording(
file,
executor,
object : VideoCapture.OnVideoSavedCallback {
override fun onVideoSaved(file: File) {
Handler(Looper.getMainLooper()).post {
showMessage(file.name + " is saved")
}
}
override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
Handler(Looper.getMainLooper()).post {
showMessage(videoCaptureError.toString() + " " + message)
}
}
}
)
}
#SuppressLint("RestrictedApi")
private fun stopRecording() {
videoCapture.stopRecording()
}
override fun getCameraXConfig(): CameraXConfig {
return Camera2Config.defaultConfig()
}
companion object {
private const val FILENAME = "yyyy_MM_dd_HH_mm_ss"
private const val VIDEO_EXTENSION = ".mp4"
private val permissions = arrayOf(
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.CAMERA,
Manifest.permission.RECORD_AUDIO
)
fun getOutputDirectory(context: Context): File {
val appContext = context.applicationContext
val mediaDir = appContext.externalMediaDirs.firstOrNull()?.let {
File(it, appContext.resources.getString(R.string.app_name)).apply { mkdirs() }
}
return if (mediaDir != null && mediaDir.exists()) mediaDir else appContext.filesDir
}
fun createFile(baseFolder: File, format: String, extension: String) =
File(baseFolder, SimpleDateFormat(format, Locale.US)
.format(System.currentTimeMillis()) + extension)
}

Updating on Patel Pinkal's answer.
Having beta released, we can't use VideoCaptureConfig.Builder() anymore, instead you go with something like this:
videoCapture = VideoCapture.Builder().apply {
// init config here
}.build()

As of April 2021
val videoCapture = VideoCapture.Builder().build()
val outputDirectory = getOutputDirectory()
fun getOutputDirectory(): File {
val mediaDir = externalMediaDirs.firstOrNull()?.let {
File(it, resources.getString(R.string.app_name)).apply { mkdirs() } }
return if (mediaDir != null && mediaDir.exists())
mediaDir else filesDir
}
#SuppressLint("RestrictedApi")
private fun startRecording() {
val videoFile = File(
outputDirectory,
SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS", Locale.US
).format(System.currentTimeMillis()) + ".mp4")
val outputOptions = VideoCapture.OutputFileOptions.Builder(videoFile).build()
videoCapture?.startRecording(outputOptions, ContextCompat.getMainExecutor(this), object: VideoCapture.OnVideoSavedCallback {
override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
Log.e(TAG, "Video capture failed: $message")
}
override fun onVideoSaved(outputFileResults: VideoCapture.OutputFileResults) {
val savedUri = Uri.fromFile(videoFile)
val msg = "Video capture succeeded: $savedUri"
Toast.makeText(baseContext, msg, Toast.LENGTH_SHORT).show()
Log.d(TAG, msg)
}
})
}
#SuppressLint("RestrictedApi")
private fun stopRecording() {
videoCapture?.stopRecording()
}
Please note that this API is still restricted and is still subject to change.

CameraX VideoCapture use case is implemented in camera-video, released since 1.1.0-alpha30. Refer to the following:
the official documentation
the reference doc
sample
youtube video(current CameraX status)
for details.

Regarding Sergei's answer, videoCapture.startRecording() recieves VideoCapture.OutputFileOptions instead of file for camerax_version = '1.0.0-rc01', so it should be used as:
videoCapture.startRecording(
VideoCapture.OutputFileOptions.Builder(file).build(),
executor,
object : VideoCapture.OnVideoSavedCallback {
override fun onVideoSaved(outputFileResults: VideoCapture.OutputFileResults) {
TODO("Not yet implemented")
}
override fun onError(videoCaptureError: Int, message: String, cause: Throwable?) {
TODO("Not yet implemented")
}
}