Open a file from Downloads folder using FileProvider

AndroidManifest.xml

        <provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.provider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/rc_file_path" />
        </provider>

gistfile1.txt

    private fun openFile(file: File?) {
        val intent = Intent(Intent.ACTION_VIEW)
        val data: Uri
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            data = Uri.fromFile(file)
        } else {
            intent.flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
            data = FileProvider.getUriForFile(this, "$packageName.provider", file)
        }
        intent.setDataAndType(data, getMimeType(data))
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
        startActivity(intent)
    }

gistfile2.txt

    private fun getMimeType(uri: Uri): String? {
        val mimeType: String? = if (ContentResolver.SCHEME_CONTENT == uri.scheme) {
            val cr = contentResolver
            cr.getType(uri)
        } else {
            val fileExtension = MimeTypeMap.getFileExtensionFromUrl(uri.toString())
            MimeTypeMap.getSingleton().getMimeTypeFromExtension(
                fileExtension.lowercase(Locale.getDefault())
            )
        }
        return mimeType
    }

rc_file_path.xml

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path name="rc_external_path" path="."/>
</paths>