修复条码扫描仪相机失真

如何解决修复条码扫描仪相机失真

我想在我的应用中使用条形码扫描仪。不幸的是，SurfaceView 中的预览极度失真。

在此 SurfaceView 中，应显示条码扫描器的相机预览。

                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="fill_parent"
                    android:background="@drawable/image_prev"
                    android:layout_height="261dp" >

                    <SurfaceView
                        android:id="@+id/barcode_view"
                        android:layout_width="match_parent"
                        android:layout_height="0dp"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintLeft_toLeftOf="parent"
                        app:layout_constraintRight_toRightOf="parent"
                        app:layout_constraintTop_toTopOf="parent">

                    </SurfaceView>

                    <ImageView
                        android:id="@+id/retry"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:src="@drawable/retry"
                        app:layout_constraintBottom_toBottomOf="parent"
                        app:layout_constraintEnd_toEndOf="parent"></ImageView>

                </androidx.constraintlayout.widget.ConstraintLayout>

这是我的整个 Kotlin 课程：

class BarcodeActivity : AppCompatActivity() {

private val requestCodeCameraPermission = 1001
private lateinit var cameraSource: CameraSource
private lateinit var detector: BarcodeDetector

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_barcode)

    if (ContextCompat.checkSelfPermission(this,android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        askForCameraPermission()
    } else {
        setupControls()
    }

    if (Build.VERSION.SDK_INT >= 19 && Build.VERSION.SDK_INT < 21) {
        setwindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,true)
    }
    if (Build.VERSION.SDK_INT >= 19) {
        window.decorView.systemUIVisibility =
            View.SYstem_UI_FLAG_LAYOUT_STABLE or View.SYstem_UI_FLAG_LAYOUT_FULLSCREEN
    }
    if (Build.VERSION.SDK_INT >= 21) {
        setwindowFlag(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS,false)
        window.statusBarColor = Color.TRANSPARENT
        window.decorView.systemUIVisibility =
            View.SYstem_UI_FLAG_LAYOUT_STABLE or View.SYstem_UI_FLAG_LAYOUT_FULLSCREEN or View.SYstem_UI_FLAG_LIGHT_STATUS_BAR
    }
}

private fun setwindowFlag(bits: Int,on: Boolean) {
    val win = window
    val winParams = win.attributes
    if (on) {
        winParams.flags = winParams.flags or bits
    } else {
        winParams.flags = winParams.flags and bits.inv()
    }
    win.attributes = winParams
}

private fun setupControls() {
    detector = BarcodeDetector.Builder(this).build()
    cameraSource = CameraSource.Builder(this,detector)
        .setAutoFocusEnabled(true)
        .build()
    barcode_view.holder.addCallback(surfaceCallBack)
    detector.setProcessor(processor)
}

private fun askForCameraPermission() {
    ActivityCompat.requestPermissions(
        this,arrayOf(android.Manifest.permission.CAMERA),requestCodeCameraPermission
    )
}

override fun onRequestPermissionsResult(
    requestCode: Int,permissions: Array<out String>,grantResults: IntArray
) {
    super.onRequestPermissionsResult(requestCode,permissions,grantResults)
    if(requestCode == requestCodeCameraPermission && grantResults.isNotEmpty()) {
        if(grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            setupControls()
        } else {
            Toast.makeText(applicationContext,"Berechtigung nicht gegeben",Toast.LENGTH_SHORT).show()
        }
    }
}

private val surfaceCallBack = object : SurfaceHolder.Callback {

    override fun surfaceChanged(p0: SurfaceHolder?,p1: Int,p2: Int,p3: Int) {

    }

    override fun surfaceDestroyed(p0: SurfaceHolder?) {
        cameraSource.stop()
    }

    override fun surfaceCreated(surfaceHolder: SurfaceHolder?) {
        try {
            if (ActivityCompat.checkSelfPermission(
                    this@BarcodeActivity,android.Manifest.permission.CAMERA
                ) != PackageManager.PERMISSION_GRANTED
            ) {
                // Todo: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions,and then overriding
                //   public void onRequestPermissionsResult(int requestCode,String[] permissions,//                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return
            }
            cameraSource.start(surfaceHolder)
        } catch (exception: Exception) {
            Toast.makeText(
                applicationContext,"Ups,da ist was schief gelaufen...",Toast.LENGTH_SHORT
            ).show()
        }
    }
}

private val processor = object : Detector.Processor<Barcode>{

    override fun release() {
        Todo("Not yet implemented")
    }

    override fun receiveDetections(detections: Detector.Detections<Barcode>?) {

        if(detections != null && detections.detectedItems.isNotEmpty()) {
            val qrCodes: SparseArray<Barcode> = detections.detectedItems
            val code = qrCodes.valueAt(0)
            editTextBarcode.text = code.displayValue
        } else {
            editTextBarcode.text = ""
        }
    }
}

}

相机预览是否有可能自动获取Surface View的格式或分辨率？

我希望有人能够帮助我解决这个问题。

非常感谢。