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<uses-permission android:name="android.permission.CAMERA"/>

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implementation 'com.camerakit:camerakit:1.0.0-beta3.11'
implementation 'com.camerakit:jpegkit:0.1.0'
implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.31'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.0'

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<com.camerakit.CameraKitView
        android:layout_above="@id/btn_detect"
        android:layout_width="match_parent"
        android:id="@+id/camera_view"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"
        android:keepScreenOn="true"
        app:camera_flash="auto"
        app:camera_facing="back"
        app:camera_focus="continuous"

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override fun onResume() {
    super.onResume()
    camera_view.onResume()
}
override fun onPause() {
    super.onPause()
    camera_view.onPause()
}
override fun onStart() {
    super.onStart()

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override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    camera_view.onRequestPermissionsResult(requestCode, permissions, grantResults)
}

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btn_detect.setOnClickListener {
   camera_view.captureImage { cameraKitView, byteArray -> }
}

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btn_detect.setOnClickListener {
     camera_view.captureImage { cameraKitView, byteArray ->
         camera_view.onStop()
         alertDialog.show()
         var bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray?.size ?: 0)
         bitmap = Bitmap.createScaledBitmap(bitmap, camera_view?.width ?: 0, camera_view?.height ?: 0, false)
         runDetector(bitmap)
     }
     graphic_overlay.clear()
}

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val image = FirebaseVisionImage.fromBitmap(bitmap)

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val options = FirebaseVisionFaceDetectorOptions.Builder().build()

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val detector = FirebaseVision.getInstance().getVisionFaceDetector(options)