fun testGetFile(contentUri: String) : File? {
        val file = File(cacheDir, "img_${System.currentTimeMillis()}")

        try {
            file.createNewFile()
        } catch (ex: IOException) {
            Log.e("debug", "Error while file creation", ex)
            return file
        }

        val inputStream = contentResolver.openInputStream(Uri.parse(contentUri))
        val bytearray = inputStream.readBytes()

        val outputStream = FileOutputStream(file)
        outputStream.write(bytearray)

        return file
    }