queryCalenderProvider

 private fun queryCalenderProvider(

        uri: Uri = CalendarContract.Calendars.CONTENT_URI,
        eventProjection: Array<String>,
        selection: String? = null,
        selectionArgs: Array<String>? = null,
        callback: (Cursor?) -> Unit
    ) {

        if (ContextCompat.checkSelfPermission(
                context,
                Manifest.permission.READ_CALENDAR
            ) == PackageManager.PERMISSION_GRANTED
        ) {
            doAsync {
                val cursor = contentResolver.query(uri, eventProjection, selection, selectionArgs, null)
                uiThread { callback(cursor) }

            }
        } else {
            callback(null)
        }
    }