Android：尝试获取保存的图像 URI 时没有内容提供程序

Question

我有一个片段应该：打开相机，显示拍摄的照片，保存 URI 路径（sqlite）并在我返回片段时再次显示该照片（获取保存的 URI 路径）

我的问题是当我尝试将保存的 URI 路径转换为位图时。 此错误发生：

FileNotFoundException: No content provider: 
/external_files/Pictures/JPEG_20201001_234640_3080292023640638214.jpg (No such file or directory)

我的片段：

class TakePictureFragment : Fragment() {
    
    private var photoURI: Uri? = null
    private var imageView: ImageView? = null
    
    private val itemId by lazy {
        arguments?.getLong("ITEM_ID")
    }
    
    override fun onCreateView(
            inflater: LayoutInflater,
            container: ViewGroup?,
            savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.content_take_picture,container,false)
        imageView = view.findViewById(R.id.view_show_photo)

        val button: Button = view.findViewById(R.id.open_camera)
        button.setOnClickListener {
            openCamera()
        }
        return view
    }
    
    override fun onResume() {
        super.onResume()
        val photo = PhotoDAO.get(itemId)
        if(photo != null) {
            photoURI = Uri.parse(photo.photoURI)
            showPhoto()
        }
    }
    
    private fun openCamera() {
        val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        var photoFile: File? = null
        try {
            photoFile = createImageFile()
        } catch (ex: IOException) {
            Log.i("ERROR", "IOException")
        }
        if (photoFile != null) {
            photoURI = FileProvider.getUriForFile(context,
                    context.applicationContext.packageName + ".provider",
                    photoFile)
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
            startActivityForResult(cameraIntent, 1)
        }
    }
    
    @Throws(IOException::class)
    private fun createImageFile(): File {
        val timeStamp = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
        val imageFileName = "JPEG_" + timeStamp + "_"
        val storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
        return File.createTempFile(imageFileName, ".jpg", storageDir) 
        // The shame problem happens if I return: return File(storageDir, "$imageFileName.jpg")
    }
    
    private fun showPhoto() {
        val imageBitmap = MediaStore.Images.Media.getBitmap(context.contentResolver, photoURI)
        imageView?.setImageBitmap(imageBitmap)
    }
    
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == 1 && resultCode == RESULT_OK) {
            showPhoto()
        }
    }
    
    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        if(item.itemId == R.id.actionNext) {
            
            PhotoDAO.save(itemId, photoURI?.path)
            
            // Go to next Activity / Fragment
            
            return true
        }
        return false
    }
}

PS：URI 路径字符串正在从“PhotoDAO”中正确保存和获取

PS2：如果我使用Uri.fromFile(File(photo.photoURI)) 而不是Uri.parse(photo.photoURI)，则错误只是“没有这样的文件或目录”

Answer 1

它的工作原理是这样的：

class TakePictureFragment : Fragment() {

    private var photoURI: Uri? = null
    private var photoPath = ""
    private var imageView: ImageView? = null

    private val itemId by lazy {
        arguments?.getLong("ITEM_ID")
    }

    override fun onCreateView(
            inflater: LayoutInflater,
            container: ViewGroup?,
            savedInstanceState: Bundle?
    ): View? {
        val view = inflater.inflate(R.layout.content_take_picture,container,false)
        imageView = view.findViewById(R.id.view_show_photo)

        val button: Button = view.findViewById(R.id.open_camera)
        button.setOnClickListener {
            openCamera()
        }
        return view
    }

    override fun onResume() {
        super.onResume()
        val photo = PhotoDAO.get(itemId)
        if(photo != null) {
            photo_description.setText(photo.description)
            photoURI = FileProvider.getUriForFile(context,
                    context.applicationContext.packageName + ".provider",
                    File(photo.path))
            showPhoto()
        }
    }

    private fun openCamera() {
        val cameraIntent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
        var photoFile: File? = null
        try {
            photoFile = createImageFile()
        } catch (ex: IOException) {
            Log.i("ERROR", "IOException")
        }
        if (photoFile != null) {
            photoURI = FileProvider.getUriForFile(context,
                    context.applicationContext.packageName + ".provider",
                    photoFile)
            photoPath = photoFile.absolutePath
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
            startActivityForResult(cameraIntent, 1)
        }
    }

    @Throws(IOException::class)
    private fun createImageFile(): File {
        val timeStamp = SimpleDateFormat("yyyyMMdd_HHmmss").format(Date())
        val imageFileName = "JPEG_" + timeStamp + "_"
        val storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
        return File(storageDir, "$imageFileName.jpg")
    }

    private fun showPhoto() {
        val imageBitmap = MediaStore.Images.Media.getBitmap(context.contentResolver, photoURI)
        imageView?.setImageBitmap(imageBitmap)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == 1 && resultCode == RESULT_OK) {
            showPhoto()
        }
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        if(item.itemId == R.id.actionNext) {
            
            PhotoDAO.save(itemId, photoPath)
            
            // Go to next Activity / Fragment
            
            return true
        }
        return false
    }
}

感谢 @blackapps 在 cmets 中的“getAbsolutePath”提示。