properly retrieve data on device rotation

app/src/main/kotlin/com/simplemobiletools/calendar/pro/activities/EventActivity.kt

@@ -50,22 +50,6 @@ import kotlin.collections.ArrayList
 
 class EventActivity : SimpleActivity() {
     private val LAT_LON_PATTERN = "^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?)([,;])\\s*[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)\$"
-    private val EVENT = "EVENT"
-    private val START_TS = "START_TS"
-    private val END_TS = "END_TS"
-    private val REMINDER_1_MINUTES = "REMINDER_1_MINUTES"
-    private val REMINDER_2_MINUTES = "REMINDER_2_MINUTES"
-    private val REMINDER_3_MINUTES = "REMINDER_3_MINUTES"
-    private val REMINDER_1_TYPE = "REMINDER_1_TYPE"
-    private val REMINDER_2_TYPE = "REMINDER_2_TYPE"
-    private val REMINDER_3_TYPE = "REMINDER_3_TYPE"
-    private val REPEAT_INTERVAL = "REPEAT_INTERVAL"
-    private val REPEAT_LIMIT = "REPEAT_LIMIT"
-    private val REPEAT_RULE = "REPEAT_RULE"
-    private val ATTENDEES = "ATTENDEES"
-    private val AVAILABILITY = "AVAILABILITY"
-    private val EVENT_TYPE_ID = "EVENT_TYPE_ID"
-    private val EVENT_CALENDAR_ID = "EVENT_CALENDAR_ID"
     private val SELECT_TIME_ZONE_INTENT = 1
 
     private var mIsAllDayEvent = false

app/src/main/kotlin/com/simplemobiletools/calendar/pro/activities/TaskActivity.kt

@@ -62,6 +62,38 @@ class TaskActivity : SimpleActivity() {
         return true
     }
 
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        if (!::mTask.isInitialized) {
+            return
+        }
+
+        outState.apply {
+            putSerializable(TASK, mTask)
+            putLong(START_TS, mTaskDateTime.seconds())
+            putLong(EVENT_TYPE_ID, mEventTypeId)
+        }
+    }
+
+    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
+        super.onRestoreInstanceState(savedInstanceState)
+        if (!savedInstanceState.containsKey(START_TS)) {
+            hideKeyboard()
+            finish()
+            return
+        }
+
+        savedInstanceState.apply {
+            mTask = getSerializable(TASK) as Event
+            mTaskDateTime = Formatter.getDateTimeFromTS(getLong(START_TS))
+            mEventTypeId = getLong(EVENT_TYPE_ID)
+        }
+
+        updateEventType()
+        updateDateText()
+        updateTimeText()
+    }
+
     private fun gotTask(savedInstanceState: Bundle?, task: Event?) {
         if (task != null) {
             mTask = task

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/Constants.kt

@@ -198,6 +198,24 @@ const val DELETE_ALL_OCCURRENCES = 2
 const val REMINDER_NOTIFICATION = 0
 const val REMINDER_EMAIL = 1
 
+const val EVENT = "EVENT"
+const val TASK = "TASK"
+const val START_TS = "START_TS"
+const val END_TS = "END_TS"
+const val REMINDER_1_MINUTES = "REMINDER_1_MINUTES"
+const val REMINDER_2_MINUTES = "REMINDER_2_MINUTES"
+const val REMINDER_3_MINUTES = "REMINDER_3_MINUTES"
+const val REMINDER_1_TYPE = "REMINDER_1_TYPE"
+const val REMINDER_2_TYPE = "REMINDER_2_TYPE"
+const val REMINDER_3_TYPE = "REMINDER_3_TYPE"
+const val REPEAT_INTERVAL = "REPEAT_INTERVAL"
+const val REPEAT_LIMIT = "REPEAT_LIMIT"
+const val REPEAT_RULE = "REPEAT_RULE"
+const val ATTENDEES = "ATTENDEES"
+const val AVAILABILITY = "AVAILABILITY"
+const val EVENT_TYPE_ID = "EVENT_TYPE_ID"
+const val EVENT_CALENDAR_ID = "EVENT_CALENDAR_ID"
+
 fun getNowSeconds() = System.currentTimeMillis() / 1000L
 
 fun isWeekend(i: Int, isSundayFirst: Boolean): Boolean {