avoid deleting default event type

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

@@ -52,6 +52,10 @@ class ManageEventTypesActivity : SimpleActivity(), DeleteItemsListener {
     }
 
     override fun deleteItems(ids: ArrayList<Int>) {
+        if (ids.contains(DBHelper.REGULAR_EVENT_ID)) {
+            toast(R.string.cannot_delete_default_type)
+        }
+
         DBHelper.newInstance(applicationContext).deleteEventTypes(ids) {
             if (it > 0) {
                 getEventTypes()

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

@@ -51,6 +51,8 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     companion object {
         private val DB_NAME = "events.db"
         private val DB_VERSION = 7
+        val REGULAR_EVENT_ID = 1
+
         private var mEventsListener: EventUpdateListener? = null
 
         fun newInstance(context: Context, callback: EventUpdateListener? = null): DBHelper {
@@ -237,7 +239,14 @@ class DBHelper private constructor(val context: Context) : SQLiteOpenHelper(cont
     }
 
     fun deleteEventTypes(ids: ArrayList<Int>, callback: (deletedCnt: Int) -> Unit) {
-        val args = TextUtils.join(", ", ids)
+        var deleteIds = ids
+        if (ids.contains(DBHelper.REGULAR_EVENT_ID))
+            deleteIds = ids.filter { it != DBHelper.REGULAR_EVENT_ID } as ArrayList<Int>
+
+        if (deleteIds.isEmpty())
+            return
+
+        val args = TextUtils.join(", ", deleteIds)
         val selection = "$COL_TYPE_ID IN ($args)"
         callback.invoke(mDb.delete(TYPES_TABLE_NAME, selection, null))
     }

app/src/main/res/values-de/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-es-rES/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-fr/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-hi-rIN/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-hu/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-it/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-iw/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-ja/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-pt-rPT/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-ru/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-sk/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Typ s daným názvom už existuje</string>
     <string name="color">Farba</string>
     <string name="regular_event">Bežná udalosť</string>
+    <string name="cannot_delete_default_type">Predvolený typ nie je možné vymazať</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values-sv/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>

app/src/main/res/values/strings.xml

@@ -87,6 +87,7 @@
     <string name="type_already_exists">Type with this title already exists</string>
     <string name="color">Color</string>
     <string name="regular_event">Regular event</string>
+    <string name="cannot_delete_default_type">Default event type cannot be deleted</string>
 
     <!-- Settings -->
     <string name="manage_event_types">Manage event types</string>