访问为 Textrecognizer 创建的变量

问题描述

截至目前，用户可以选择上传图片或使用相机拍摄，然后将其放入 ImageView。紧接着，用户可以使用按钮开始文本识别。

但是由于我在 onActivity 结果函数的 If 语句中创建了保存所选图片的变量，因此我不确定从何处启动所选图像的变量以在 startRecognition 函数中访问它。

class Scanner : Fragment() {
private lateinit var imageView: ImageView
private lateinit var photoFile: File
private lateinit var textView: TextView
private lateinit var btnAnalyze: Button

private val FILE_NAME= "photo.jpg"
private val REQUEST_CODE_KAMERA = 42
private val REQUEST_CODE_GALLERY = 69

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

}

override fun onCreateView(
    inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?):
        View? {val view: View = inflater!!.inflate(R.layout.fragment_scan,container,false)
    val btnTakePicture: Button = view.findViewById(R.id.btnTakePicture)
    imageView = view.findViewById(R.id.imageView)
    btnAnalyze = view.findViewById(R.id.btnAnalyze)

    //Button Picture
    btnTakePicture.setOnClickListener {
        val builder: AlertDialog.Builder = AlertDialog.Builder(requireActivity())
        builder.setTitle("Choose a Receipt")
        builder.setMessage("Either upload a Receipt or take a picture of one")
        // add the buttons
        builder.setPositiveButton("Use camera",DialogInterface.OnClickListener { dialog,which ->

            val takePictureIntent: Intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
            photoFile = getPhotoFile(FILE_NAME)
            val fileProvider = FileProvider.getUriForFile(requireActivity(),"com.example.nlp_expense_tracker.fileprovider",photoFile)
            takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,fileProvider)
            startActivityForResult(takePictureIntent,REQUEST_CODE_KAMERA)
        })

        builder.setNegativeButton("Upload from gallery",which ->
                val intent = Intent(Intent.ACTION_PICK)
                intent.type = "image/*"
                startActivityForResult(intent,REQUEST_CODE_GALLERY)
        })
        val dialog: AlertDialog = builder.create()
        dialog.show()

        //Button Analyze
        btnAnalyze.setOnClickListener{
            startTextRecognition()
        }

    }
    return view
}

private fun getPhotoFile(fileName: String): File {
   val storageDirectory = activity?.getExternalFilesDir(Environment.DIRECTORY_PICTURES)
    return File.createTempFile(fileName,".jpg",storageDirectory)
}

override fun onActivityResult(requestCode: Int,resultCode: Int,data: Intent?) {
    if (requestCode == REQUEST_CODE_KAMERA && resultCode == Activity.RESULT_OK) { //Wenn Kamera ausgewählt wird
        val choosenImage =
            BitmapFactory.decodeFile(photoFile.absolutePath) //<- Path des Fotos welches wir gemacht haben
        imageView.setImageBitmap(choosenImage)
    } else if (requestCode == REQUEST_CODE_GALLERY && resultCode == Activity.RESULT_OK) { //Wenn Galerie ausgewählt wird
        val imageUri = data?.data
        try {
            val choosenImage =
                MediaStore.Images.Media.getBitmap(activity?.getContentResolver(),imageUri)
            imageView.setImageBitmap(choosenImage)
        } catch (e: IOException) {
            e.printStackTrace()
        }
    }

    super.onActivityResult(requestCode,resultCode,data)
}
private fun startTextRecognition(){
    textView = view!!.findViewById(R.id.btnAnalyze)
    val inputImage = InputImage.fromBitmap(choosenImage,0)
    val recognizer = TextRecognition.getClient()
    recognizer.process(inputImage)
        .addOnSuccessListener {
            textView.text = it.text
            Log.d(TAG,"sucessful")
        }
        .addOnFailureListener {
            Log.d(TAG,"not sucessful",it)
        }
}

}

解决方法

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