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238 changes: 238 additions & 0 deletions
238
...main/java/com/mickstarify/zooforzotero/LibraryActivity/Fragments/BarcodeScanningScreen.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,238 @@ | ||
| package com.mickstarify.zooforzotero.LibraryActivity.Fragments | ||
|
|
||
| import android.Manifest | ||
| import android.content.Context | ||
| import android.content.pm.PackageManager | ||
| import android.graphics.BitmapFactory | ||
| import android.graphics.ImageFormat | ||
| import android.hardware.camera2.CameraAccessException | ||
| import android.hardware.camera2.CameraCaptureSession | ||
| import android.hardware.camera2.CameraCharacteristics | ||
| import android.hardware.camera2.CameraDevice | ||
| import android.hardware.camera2.CameraManager | ||
| import android.media.ImageReader | ||
| import android.os.Bundle | ||
| import android.os.Handler | ||
| import android.util.Log | ||
| import android.view.LayoutInflater | ||
| import android.view.Menu | ||
| import android.view.MenuInflater | ||
| import android.view.SurfaceHolder | ||
| import android.view.SurfaceView | ||
| import android.view.View | ||
| import android.view.ViewGroup | ||
| import android.widget.Toast | ||
| import androidx.core.content.ContextCompat | ||
| import androidx.fragment.app.Fragment | ||
| import androidx.lifecycle.ViewModelProvider | ||
| import androidx.navigation.fragment.findNavController | ||
| import com.google.android.gms.vision.Frame | ||
| import com.google.android.gms.vision.barcode.Barcode | ||
| import com.google.android.gms.vision.barcode.BarcodeDetector | ||
| import com.mickstarify.zooforzotero.LibraryActivity.ViewModels.LibraryListViewModel | ||
| import com.mickstarify.zooforzotero.R | ||
|
|
||
| class BarcodeScanningScreen : Fragment() { | ||
|
|
||
| companion object { | ||
| fun newInstance() = BarcodeScanningScreen() | ||
| const val REQUEST_CAMERA = 1729 | ||
| } | ||
|
|
||
| private lateinit var viewModel: LibraryListViewModel | ||
| lateinit var cameraView: SurfaceView | ||
|
|
||
| override fun onCreateView( | ||
| inflater: LayoutInflater, container: ViewGroup?, | ||
| savedInstanceState: Bundle? | ||
| ): View? { | ||
| return inflater.inflate(R.layout.barcode_scanning_screen_fragment, container, false) | ||
| } | ||
|
|
||
| override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) { | ||
| menu.clear() | ||
| inflater.inflate(R.menu.barcode_scanning_menu, menu) | ||
| super.onCreateOptionsMenu(menu, inflater) | ||
| } | ||
|
|
||
| override fun onActivityCreated(savedInstanceState: Bundle?) { | ||
| super.onActivityCreated(savedInstanceState) | ||
| setHasOptionsMenu(true) | ||
| viewModel = ViewModelProvider(requireActivity()).get(LibraryListViewModel::class.java) | ||
|
|
||
| cameraView = requireView().findViewById<SurfaceView>(R.id.cameraPreview) | ||
| cameraView.holder.addCallback(object : SurfaceHolder.Callback { | ||
| override fun surfaceCreated(holder: SurfaceHolder) {} | ||
| override fun surfaceDestroyed(holder: SurfaceHolder) {} | ||
|
|
||
| override fun surfaceChanged( | ||
| holder: SurfaceHolder, | ||
| format: Int, | ||
| width: Int, | ||
| height: Int | ||
| ) { | ||
| showCameraPreview(width, height) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| override fun onStart() { | ||
| super.onStart() | ||
|
|
||
| if (ContextCompat.checkSelfPermission( | ||
| requireContext(), | ||
| Manifest.permission.CAMERA | ||
| ) != PackageManager.PERMISSION_GRANTED | ||
| ) { | ||
| requestPermissions(arrayOf(Manifest.permission.CAMERA), REQUEST_CAMERA) | ||
| } else { | ||
| // start camera feed | ||
| } | ||
| } | ||
|
|
||
| // we will use this to determine the amount of frames in a row that we detect a barcode. | ||
| // this is done for accuracy reasons as using one frame was allowing the phone to misdetect | ||
| // barcodes. | ||
| var detectedInARow: Int = 0 | ||
| var lastChange = 0L | ||
| var lastReadBarcodeNo: String = "" | ||
|
|
||
| var camera: CameraDevice? = null | ||
|
|
||
| fun showCameraPreview(width: Int, height: Int) { | ||
| val cameraView = requireView().findViewById<SurfaceView>(R.id.cameraPreview) | ||
|
|
||
| try { | ||
| val cameraBkgHandler = Handler() | ||
|
|
||
| val cameraManager = | ||
| requireActivity().getSystemService(Context.CAMERA_SERVICE) as CameraManager | ||
|
|
||
| cameraManager.cameraIdList.find { | ||
| val characteristics = cameraManager.getCameraCharacteristics(it) | ||
| val cameraDirection = characteristics.get(CameraCharacteristics.LENS_FACING) | ||
|
|
||
| return@find cameraDirection != null && cameraDirection == CameraCharacteristics.LENS_FACING_BACK | ||
| }?.let { | ||
| val cameraStateCallback = object : CameraDevice.StateCallback() { | ||
| override fun onOpened(camera: CameraDevice) { | ||
| this@BarcodeScanningScreen.camera = camera | ||
| val barcodeDetector = BarcodeDetector.Builder(requireContext()) | ||
| .setBarcodeFormats(Barcode.ALL_FORMATS) | ||
| .build() | ||
|
|
||
| if (barcodeDetector.isOperational == false) { | ||
| Toast.makeText( | ||
| requireContext(), | ||
| "Failed to load barcode detector", | ||
| Toast.LENGTH_SHORT | ||
| ).show() | ||
| stopScanning() | ||
| } | ||
|
|
||
| val imgReader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1) | ||
| imgReader.setOnImageAvailableListener({ reader -> | ||
| val cameraImage = reader.acquireNextImage() | ||
| val buffer = cameraImage.planes.first().buffer | ||
| val bytes = ByteArray(buffer.capacity()) | ||
| buffer.get(bytes) | ||
|
|
||
| val bitmap = | ||
| BitmapFactory.decodeByteArray(bytes, 0, bytes.count(), null) | ||
| val frameToProcess = Frame.Builder().setBitmap(bitmap).build() | ||
| val barcodeResults = barcodeDetector.detect(frameToProcess) | ||
| if (barcodeResults.size() > 0) { | ||
| // Scanned a barcode! | ||
| val result = barcodeResults.valueAt(0) | ||
| Log.d("zotero", "scanned ${result.rawValue}") | ||
| if (result.rawValue == lastReadBarcodeNo) { | ||
| detectedInARow++ | ||
| } else { | ||
| detectedInARow = 0 | ||
| lastReadBarcodeNo = result.rawValue | ||
| } | ||
|
|
||
| if (detectedInARow == 3) { | ||
| val barcodeNo = barcodeResults.valueAt(0).rawValue | ||
| viewModel.scannedBarcodeNumber(barcodeNo) | ||
| stopScanning() | ||
| } | ||
| } else { | ||
| } | ||
| cameraImage.close() | ||
|
|
||
| }, cameraBkgHandler) | ||
|
|
||
| val captureStateCallback = object : CameraCaptureSession.StateCallback() { | ||
| override fun onConfigured(session: CameraCaptureSession) { | ||
| val builder = | ||
| camera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW) | ||
|
|
||
| builder.addTarget(cameraView.holder.surface) | ||
| builder.addTarget(imgReader.surface) | ||
| session.setRepeatingRequest(builder.build(), null, null) | ||
| } | ||
|
|
||
| override fun onConfigureFailed(session: CameraCaptureSession) { | ||
| } | ||
| } | ||
|
|
||
| camera.createCaptureSession( | ||
| listOf(cameraView.holder.surface, imgReader.surface), | ||
| captureStateCallback, | ||
| cameraBkgHandler | ||
| ) | ||
| } | ||
|
|
||
| override fun onClosed(camera: CameraDevice) { | ||
| } | ||
|
|
||
| override fun onDisconnected(camera: CameraDevice) { | ||
| } | ||
|
|
||
| override fun onError(camera: CameraDevice, error: Int) { | ||
| } | ||
| } | ||
|
|
||
| cameraManager.openCamera(it, cameraStateCallback, cameraBkgHandler) | ||
| return | ||
| } | ||
|
|
||
| // TODO: - No available camera found case | ||
|
|
||
| } catch (e: CameraAccessException) { | ||
| } catch (e: SecurityException) { | ||
| } | ||
| } | ||
|
|
||
| private fun stopScanning() { | ||
| this.camera?.close() | ||
| findNavController().navigateUp() | ||
| } | ||
|
|
||
| override fun onStop() { | ||
| super.onStop() | ||
| this.camera?.close() | ||
| } | ||
|
|
||
| override fun onRequestPermissionsResult( | ||
| requestCode: Int, | ||
| permissions: Array<out String>, | ||
| grantResults: IntArray | ||
| ) { | ||
| super.onRequestPermissionsResult(requestCode, permissions, grantResults) | ||
|
|
||
| if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED | ||
| && requestCode == REQUEST_CAMERA | ||
| ) { | ||
| showCameraPreview(cameraView.measuredWidth, cameraView.measuredHeight) | ||
| } else { | ||
| Toast.makeText( | ||
| requireContext(), | ||
| "This functionality requires the camera. Please provide the camera permission.", | ||
| Toast.LENGTH_SHORT | ||
| ).show() | ||
| findNavController().navigateUp() | ||
| } | ||
| } | ||
| } |
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