SurfaceViewTrouble

gistfile1.txt

class QRCodesScannerActivity : AppCompatActivity() {

    private val TAG = "CameraPermission"
    private val CAMERA_REQUEST_CODE = 101

    private lateinit var barcodeDetector: BarcodeDetector
    private lateinit var cameraSource: CameraSource

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setup(R.layout.activity_qrcodes_scanner, getString(R.string.scaning_qr_code))
        surfaceViewScanArea.setZOrderMediaOverlay(true)
        setupPermission()
    }

    private fun initScanArea() {
        barcodeDetector = BarcodeDetector.Builder(this)
            .setBarcodeFormats(Barcode.QR_CODE).build()
        cameraSource = CameraSource.Builder(this, barcodeDetector).setRequestedPreviewSize(640, 480)
            .build()

        surfaceViewScanArea.holder.addCallback(object: SurfaceHolder.Callback {
            override fun surfaceChanged(
                holder: SurfaceHolder?,
                format: Int,
                width: Int,
                height: Int
            ) {
            }

            override fun surfaceDestroyed(holder: SurfaceHolder?) {
                cameraSource.stop()
            }

            override fun surfaceCreated(holder: SurfaceHolder?) {
                cameraSource.start(holder)
            }

        })

        barcodeDetector.setProcessor(object: Detector.Processor<Barcode> {
            override fun release() {
                TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
            }

            override fun receiveDetections(detections: Detector.Detections<Barcode>?) {
                val qrCodes = detections?.detectedItems
                if (qrCodes != null && qrCodes.size() != 0) {

                    qrCodes.forEach { key, value ->
                        value.cornerPoints
                    }
                    showQrCodeOverlay()
                    Toast.makeText(this@QRCodesScannerActivity, "SCANNED!", Toast.LENGTH_SHORT).show()
                }
            }
        })
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        when (requestCode) {
            CAMERA_REQUEST_CODE -> {
                if (grantResults.isEmpty() || grantResults[0] != PackageManager.PERMISSION_GRANTED) {
                    showAlert(getString(R.string.camera_permission_required),
                        getString(R.string.alert_error_title), true)
                }
                else {
                    initScanArea()
                }
            }
        }
    }

    private fun setupPermission() {
        val permission = ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA)
        if (permission != PackageManager.PERMISSION_GRANTED) {
            makeRequestCameraPermission()
        }
        else {
            initScanArea()
        }
    }

    private fun makeRequestCameraPermission() {
        ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.CAMERA),
            CAMERA_REQUEST_CODE)
    }

    private fun showQrCodeOverlay() {
        /*val layoutParams = viewQrCodeOverlay.layoutParams as ConstraintLayout.LayoutParams
        layoutParams.setMargins(50, 15, 15, 15)
        viewQrCodeOverlay.layoutParams = layoutParams*/
        surfaceViewScanArea.setZOrderMediaOverlay(true)
        viewQrCodeOverlay.visibility = View.INVISIBLE
    }
}