Save Documents on android 11

// original link : https://androidexplained.github.io/android/android11/scoped-storage/2020/09/29/file-saving-android-11.html

private fun openDocumentToSavePDF() {
        val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
            addCategory(Intent.CATEGORY_OPENABLE)
            type = "application/pdf"
            val fileName = "Screenshot_${Calendar.getInstance().time}.pdf"
            putExtra(Intent.EXTRA_TITLE, fileName)
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                putExtra(DocumentsContract.EXTRA_INITIAL_URI, Environment.DIRECTORY_DOCUMENTS)
            }
        }
        resultLauncher.launch(intent)
    }

    private val resultLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
        if (result.resultCode == RESULT_OK) {
            result.data?.data?.let { savePDFToStorage(it) }
        }
    }

    private fun savePDFToStorage(uri: Uri) {
        val metrics = resources.displayMetrics
        val document = PdfDocument()
        val pageInfo = PageInfo.Builder(metrics.widthPixels, metrics.heightPixels, 1).create()
        val page = document.startPage(pageInfo)
        val bitmap = getViewScreenshot(imageView)
        page.canvas.drawBitmap(bitmap, 0f, 0f, null)
        document.finishPage(page)
        val imageOutStream = contentResolver.openOutputStream(uri)
        document.writeTo(imageOutStream)
        document.close()
    }