add a helper function for fetching caldav calendar events

app/src/main/kotlin/com/simplemobiletools/calendar/activities/SettingsActivity.kt

@@ -146,6 +146,10 @@ class SettingsActivity : SimpleActivity() {
                             dbHelper.insertEventType(eventType)
                         }
                     }
+
+                    calendars.forEach {
+                        fetchCalDAVCalendarEvents(it.id)
+                    }
                 }
             }).start()
         }

app/src/main/kotlin/com/simplemobiletools/calendar/extensions/Context.kt

@@ -249,7 +249,8 @@ fun Context.getCalDAVCalendars(ids: String = ""): List<CalDAVCalendar> {
     var cursor: Cursor? = null
     try {
         cursor = contentResolver.query(uri, projection, selection, null, null)
-        while (cursor.moveToNext()) {
+        cursor.moveToFirst()
+        do {
             val id = cursor.getLongValue(CalendarContract.Calendars._ID)
             val displayName = cursor.getStringValue(CalendarContract.Calendars.CALENDAR_DISPLAY_NAME)
             val accountName = cursor.getStringValue(CalendarContract.Calendars.ACCOUNT_NAME)
@@ -257,13 +258,44 @@ fun Context.getCalDAVCalendars(ids: String = ""): List<CalDAVCalendar> {
             val color = cursor.getIntValue(CalendarContract.Calendars.CALENDAR_COLOR)
             val calendar = CalDAVCalendar(id, displayName, accountName, ownerName, color)
             calendars.add(calendar)
-        }
+        } while (cursor.moveToNext())
     } finally {
         cursor?.close()
     }
     return calendars
 }
 
+fun Context.fetchCalDAVCalendarEvents(calendarID: Long) {
+    val eventsUri = CalendarContract.Events.CONTENT_URI
+    val projection = arrayOf(
+            CalendarContract.Events._ID,
+            CalendarContract.Events.TITLE,
+            CalendarContract.Events.DESCRIPTION,
+            CalendarContract.Events.DTSTART,
+            CalendarContract.Events.DTEND,
+            CalendarContract.Events.DURATION,
+            CalendarContract.Events.ALL_DAY,
+            CalendarContract.Events.RRULE)
+    val selection = "${CalendarContract.Events.CALENDAR_ID} = $calendarID"
+
+    var cursor: Cursor? = null
+    try {
+        cursor = contentResolver.query(eventsUri, projection, selection, null, null)
+        cursor.moveToFirst()
+        do {
+            val title = cursor.getStringValue(CalendarContract.Events.TITLE)
+            val description = cursor.getStringValue(CalendarContract.Events.DESCRIPTION)
+            val startTS = cursor.getLongValue(CalendarContract.Events.DTSTART)
+            val endTS = cursor.getLongValue(CalendarContract.Events.DTEND)
+            val duration = cursor.getStringValue(CalendarContract.Events.DURATION)
+            val allDay = cursor.getIntValue(CalendarContract.Events.ALL_DAY)
+            val rrule = cursor.getStringValue(CalendarContract.Events.RRULE)
+        } while (cursor.moveToNext())
+    } finally {
+        cursor?.close()
+    }
+}
+
 fun Context.getNewEventTimestampFromCode(dayCode: String) = Formatter.getLocalDateTimeFromCode(dayCode).withTime(13, 0, 0, 0).seconds()
 
 fun Context.getCurrentOffset() = SimpleDateFormat("Z", Locale.getDefault()).format(Date())

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/DBHelper.kt

@@ -326,8 +326,6 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     fun deleteEvents(ids: Array<String>) {
         val args = TextUtils.join(", ", ids)
         val selection = "$MAIN_TABLE_NAME.$COL_ID IN ($args)"
-        val cursor = getEventsCursor(selection)
-        val events = fillEvents(cursor).filter { it.importId.isNotEmpty() }
 
         mDb.delete(MAIN_TABLE_NAME, selection, null)