IssueTracker

Please note: This component is for the CameraX API used in Jetpack. Please DO NOT file Pixel Camera issues here.

androidx.camera.view.PreviewView is showing black screen
package com.ryvl.quickcard.ui

import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.util.Size
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.camera.core.CameraSelector
import androidx.camera.core.ExperimentalGetImage
import androidx.camera.core.ImageAnalysis
import androidx.camera.lifecycle.ProcessCameraProvider
import androidx.camera.view.PreviewView
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
import androidx.databinding.DataBindingUtil
import com.google.common.util.concurrent.ListenableFuture
import com.google.mlkit.vision.barcode.BarcodeScanning
import com.google.mlkit.vision.barcode.common.Barcode
import com.google.mlkit.vision.common.InputImage
import com.ryvl.quickcard.R
import com.ryvl.quickcard.databinding.ActivityXoxoactivityBinding
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors

@ExperimentalGetImage
class XOXOActivity : AppCompatActivity() {

    private lateinit var previewView: PreviewView
//    private lateinit var scanningBox: View
    private lateinit var cameraExecutor: ExecutorService
    private lateinit var binding: ActivityXoxoactivityBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_xoxoactivity)

        previewView = binding.previewView
//        scanningBox = binding.scanningBox

        cameraExecutor = Executors.newSingleThreadExecutor()

        startScanning()
    }

    private fun startScanning() {
        val barcodeScanner = BarcodeScanning.getClient()

        val cameraProviderFuture: ListenableFuture<ProcessCameraProvider> = ProcessCameraProvider.getInstance(this)

        cameraProviderFuture.addListener({
            val cameraProvider = cameraProviderFuture.get()

            val cameraSelector = CameraSelector.Builder()
                .requireLensFacing(CameraSelector.LENS_FACING_BACK)
                .build()

            val imageAnalysis = ImageAnalysis.Builder()
                .setTargetResolution(Size(1280, 720))
                .setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
                .build()

            imageAnalysis.setAnalyzer(cameraExecutor, { image ->
                val inputImage = InputImage.fromMediaImage(
                    image.image!!, image.imageInfo.rotationDegrees
                )

                barcodeScanner.process(inputImage)
                    .addOnSuccessListener { barcodes ->
                        for (barcode in barcodes) {
                            if (barcode.format == Barcode.FORMAT_QR_CODE) {
                                val qrCodeData = barcode.rawValue
                                // Handle the QR code data
                            }
                        }
                    }
                    .addOnFailureListener { e ->
                        // Handle error
                    }
                    .addOnCompleteListener { image.close() }
            })
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                cameraProvider.bindToLifecycle(this,cameraSelector, imageAnalysis)
            }

//            cameraProvider.bindToLifecycle(this, cameraSelector, imageAnalysis)
        }, ContextCompat.getMainExecutor(this))
    }

    override fun onDestroy() {
        super.onDestroy()
        cameraExecutor.shutdown()
    }
}