XMLActivity.kt

// converts any uri(content/file) to a local temp file first in cache directory for easy read/write
suspend fun Uri.toLocalFile(context: Context,localFileLocation:File = context.cacheDir): File? {
    val uri = this
    return withContext(Dispatchers.IO) {
        try {
            val fileInfo = FileInfo.fromSAFUri(context,uri)
            val fileName = fileInfo?.nameWithExtension?: "${System.currentTimeMillis()}.bin"
            val tempFile = File(localFileLocation, fileName)
            context.contentResolver.openInputStream(uri)?.use { inputStream ->
                FileOutputStream(tempFile).use { outputStream ->
                    val buffer = ByteArray(8 * 1024)
                    var bytesRead: Int
                    while (inputStream.read(buffer).also { bytesRead = it } != -1) {
                        outputStream.write(buffer, 0, bytesRead)
                    }
                }
            }
            tempFile
        } catch (e: Exception) {
            e.printStackTrace()
            null
        }
    }
}