我正在尝试在我的应用程序中打开相机时识别QR码,然后根据QR码文本转移到相应的活动页面。我使用Firebase ML Kit和CameraX库结合Google文档进行操作,但是在ImageAnalyzer的analyze方法中出现了错误。
ImageAnalyzer要求我实现analyze方法,即使它已经被实现了。但是它有两个参数:(imageProxy:ImageProxy?,degrees:Int)并且说它没有覆盖任何东西。如果我删除第二个参数(degrees:Int),则可以识别,但“度数”未被识别。
我尝试关注一些教程,但他们使用了很多第三方库。我想使用cameraX和ML Kit。
如何解决这个问题?
以下是我的代码:
我尝试关注一些教程,但他们使用了很多第三方库。我想使用cameraX和ML Kit。
如何解决这个问题?
以下是我的代码:
package ge.softservice.nfcwithactivties
import android.Manifest
import android.annotation.SuppressLint
import android.content.pm.PackageManager
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.camera.core.*
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import com.google.firebase.ml.vision.FirebaseVision
import com.google.firebase.ml.vision.barcode.FirebaseVisionBarcode
import com.google.firebase.ml.vision.barcode.FirebaseVisionBarcodeDetectorOptions
import com.google.firebase.ml.vision.common.FirebaseVisionImage
import com.google.firebase.ml.vision.common.FirebaseVisionImageMetadata
import kotlinx.android.synthetic.main.activity_qr.*
import java.io.File
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors
class QrActivity : AppCompatActivity() {
private var preview: Preview? = null
private var imageAnalyzer: ImageAnalysis? = null
private var camera: Camera? = null
internal var isDetected = false
private lateinit var outputDirectory: File
private lateinit var cameraExecutor: ExecutorService
override fun onRequestPermissionsResult(
requestCode: Int, permissions: Array<String>, grantResults:
IntArray
) {
if (requestCode == REQUEST_CODE_PERMISSIONS) {
if (allPermissionsGranted()) {
startCamera()
} else {
Toast.makeText(
this,
"Permissions not granted by the user.",
Toast.LENGTH_SHORT
).show()
finish()
}
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_qr)
// Request camera permissions
if (allPermissionsGranted()) {
startCamera()
} else {
ActivityCompat.requestPermissions(
this, REQUIRED_PERMISSIONS, REQUEST_CODE_PERMISSIONS
)
}
// outputDirectory = getOutputDirectory()
cameraExecutor = Executors.newSingleThreadExecutor()
}
private fun startCamera() {
val options = FirebaseVisionBarcodeDetectorOptions.Builder()
.setBarcodeFormats(
FirebaseVisionBarcode.FORMAT_QR_CODE,
FirebaseVisionBarcode.FORMAT_AZTEC
)
.build()
val detector = FirebaseVision.getInstance().getVisionBarcodeDetector(options)
val result = detector.detectInImage(image)
.addOnSuccessListener { barcodes ->
// Task completed successfully
// ...
}
.addOnFailureListener {
// Task failed with an exception
// ...
}
val cameraProviderFuture = ProcessCameraProvider.getInstance(this)
cameraProviderFuture.addListener(Runnable {
// Used to bind the lifecycle of cameras to the lifecycle owner
val cameraProvider: ProcessCameraProvider = cameraProviderFuture.get()
// Preview
preview = Preview.Builder()
.build()
// Select back camera
val cameraSelector =
CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build()
try {
// Unbind use cases before rebinding
cameraProvider.unbindAll()
// Bind use cases to camera
camera = cameraProvider.bindToLifecycle(
this, cameraSelector, preview
)
preview?.setSurfaceProvider(viewFinder.createSurfaceProvider(/*camera?.cameraInfo*/))
} catch (exc: Exception) {
Log.e(TAG, "Use case binding failed", exc)
}
}, ContextCompat.getMainExecutor(this))
}
private fun takePhoto() {
// TODO
}
private fun allPermissionsGranted() = REQUIRED_PERMISSIONS.all {
ContextCompat.checkSelfPermission(
baseContext, it
) == PackageManager.PERMISSION_GRANTED
}
/* 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
}*/
companion object {
private const val TAG = "CameraXBasic"
private const val FILENAME_FORMAT = "yyyy-MM-dd-HH-mm-ss-SSS"
private const val REQUEST_CODE_PERMISSIONS = 10
private val REQUIRED_PERMISSIONS = arrayOf(Manifest.permission.CAMERA)
}
}
private class MyImageAnalyzer : ImageAnalysis.Analyzer {
private fun degreesToFirebaseRotation(degrees: Int): Int = when(degrees) {
0 -> FirebaseVisionImageMetadata.ROTATION_0
90 -> FirebaseVisionImageMetadata.ROTATION_90
180 -> FirebaseVisionImageMetadata.ROTATION_180
270 -> FirebaseVisionImageMetadata.ROTATION_270
else -> throw Exception("Rotation must be 0, 90, 180, or 270.")
}
@SuppressLint("UnsafeExperimentalUsageError")
override fun analyze(imageProxy: ImageProxy?, degrees: Int) {
val mediaImage = imageProxy?.image
val imageRotation = degreesToFirebaseRotation(degrees)
if (mediaImage != null) {
val image = FirebaseVisionImage.fromMediaImage(mediaImage, imageRotation)
// Pass image to an ML Kit Vision API
// ...
}
}
}
degreesToFirebaseRotation
是什么意思? - user924