avoid adding the same contact birthday multiple times

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

@@ -307,6 +307,7 @@ class MainActivity : SimpleActivity(), NavigationListener {
             eventTypeId = dbHelper.insertEventType(eventType)
         }
 
+        val birthdayImportIDs = dbHelper.getBirthdays().map { it.importId }
         var birthdaysAdded = 0
         val uri = ContactsContract.Data.CONTENT_URI
         val projection = arrayOf(ContactsContract.Contacts.DISPLAY_NAME,
@@ -330,10 +331,11 @@ class MainActivity : SimpleActivity(), NavigationListener {
                     val event = Event(0, timestamp, timestamp, name, importId = contactId, flags = FLAG_ALL_DAY, repeatInterval = YEAR,
                             eventType = eventTypeId, source = SOURCE_CONTACT_BIRTHDAY, lastUpdated = lastUpdated)
 
-                    dbHelper.insert(event, false) {
-                        birthdaysAdded++
+                    if (!birthdayImportIDs.contains(contactId)) {
+                        dbHelper.insert(event, false) {
+                            birthdaysAdded++
+                        }
                     }
-
                 } while (cursor.moveToNext())
             }
         } catch (e: Exception) {
@@ -344,6 +346,7 @@ class MainActivity : SimpleActivity(), NavigationListener {
 
         runOnUiThread {
             toast(if (birthdaysAdded > 0) R.string.birthdays_added else R.string.no_birthdays)
+            updateViewPager()
         }
     }
 

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

@@ -394,6 +394,13 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         return null
     }
 
+    fun getBirthdays(): List<Event> {
+        val selection = "$MAIN_TABLE_NAME.$COL_EVENT_SOURCE = ?"
+        val selectionArgs = arrayOf(SOURCE_CONTACT_BIRTHDAY)
+        val cursor = getEventsCursor(selection, selectionArgs)
+        return fillEvents(cursor)
+    }
+
     fun deleteEvents(ids: Array<String>, deleteFromCalDAV: Boolean) {
         val args = TextUtils.join(", ", ids)
         val selection = "$MAIN_TABLE_NAME.$COL_ID IN ($args)"
@@ -547,10 +554,11 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
         val selectionArgs = arrayOf(id.toString())
         val cursor = getEventsCursor(selection, selectionArgs)
         val events = fillEvents(cursor)
-        return if (!events.isEmpty())
+        return if (events.isNotEmpty()) {
             events[0]
-        else
+        } else {
             null
+        }
     }
 
     fun getEvents(fromTS: Int, toTS: Int, eventId: Int = -1, callback: (events: MutableList<Event>) -> Unit) {