Android Barcode Scanner with Camera1 + MLKit

activity_camera1.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".Camera1Activity">

    <SurfaceView
        android:id="@+id/preview_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Camera1Activity.kt

package com.felipeslongo.mlbarcodescanner

import android.graphics.ImageFormat
import android.hardware.Camera
import android.os.Bundle
import android.util.Log
import android.view.SurfaceHolder
import android.view.SurfaceView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.google.mlkit.vision.barcode.BarcodeScanner
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.common.InputImage


class Camera1Activity : AppCompatActivity() {

    var cameraView: SurfaceView? = null
    var camera: Camera? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        Log.e("Camera1Activity", "ENTROU AQUI")
        super.onCreate(savedInstanceState)
       // Thread.sleep(4000)
        setContentView(R.layout.activity_camera1)
        cameraView = findViewById(R.id.preview_view)

        val barcodeScanner: BarcodeScanner = BarcodeScanning.getClient()

        cameraView!!.holder.addCallback(object : SurfaceHolder.Callback {
            override fun surfaceCreated(surfaceHolder: SurfaceHolder) {
                camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT)
                camera!!.setDisplayOrientation(90)
                camera!!.setPreviewDisplay(surfaceHolder)

                camera!!.setPreviewCallback { bytes, camera ->
                    val parameters = camera.parameters
                    val inputImage = InputImage.fromByteArray(
                        bytes,
                        parameters.previewSize.width,
                        parameters.previewSize.height,
                        90,
                        ImageFormat.NV21 //ImageFormat.YV12
                    )

                    barcodeScanner.process(inputImage)
                        .addOnSuccessListener { barcodes ->
                            barcodes.forEach {
                                Toast.makeText(this@Camera1Activity, it.rawValue, Toast.LENGTH_SHORT).show()
                            }
                        }
                        .addOnFailureListener {
                            Toast.makeText(this@Camera1Activity, it.toString(), Toast.LENGTH_SHORT).show()
                        }.addOnCompleteListener {

                        }
                }
            }

            override fun surfaceChanged(surfaceHolder: SurfaceHolder, p1: Int, p2: Int, p3: Int) {
                camera!!.startPreview();
            }

            override fun surfaceDestroyed(surfaceHolder: SurfaceHolder) {
                camera!!.apply {
                    stopPreview()
                    release()
                }
                camera = null
            }

        })
    }
}