Ignore RDATEs when there's an also an infinite RRULE to avoid calendar provider exception (#114)

* Ignore RDATEs when there's an also an infinite RRULE to avoid calendar provider exception

* Added test

Signed-off-by: Arnau Mora <[email protected]>

* Tighten test intention

* Remove unused import directive

---------

Signed-off-by: Arnau Mora <[email protected]>
Co-authored-by: Arnau Mora <[email protected]>
Co-authored-by: Sunik Kupfer <[email protected]>

Author: 3 people

lib/src/androidTest/kotlin/at/bitfire/ical4android/AndroidEventTest.kt

@@ -264,6 +264,21 @@ class AndroidEventTest {
         assertEquals("${tzShanghai.id};20200601T123000,20200701T183000,20200702T183000,20200801T123000,20200802T123000", values.getAsString(Events.RDATE))
     }
 
+    @Test
+    fun testBuildEvent_NonAllDay_DtEnd_NoDuration_Recurring_InfiniteRruleAndRdate() {
+        val values = buildEvent(false) {
+            dtStart = DtStart("20200601T123000", tzShanghai)
+            dtEnd = DtEnd("20200601T123000", tzVienna)
+            rRules += RRule(
+                Recur("FREQ=DAILY;INTERVAL=2")
+            )
+            rDates += RDate(DateList("20200701T123000,20200702T123000", Value.DATE_TIME, tzVienna))
+        }
+
+        assertNull(values.get(Events.RDATE))
+        assertEquals("FREQ=DAILY;INTERVAL=2", values.get(Events.RRULE))
+    }
+
     @Test
     fun testBuildEvent_NonAllDay_DtEnd_Duration_NonRecurring() {
         val values = buildEvent(false) {

lib/src/main/kotlin/at/bitfire/ical4android/AndroidEvent.kt

@@ -791,15 +791,25 @@ abstract class AndroidEvent(
                 builder.withValue(Events.RRULE, null)
 
             if (event.rDates.isNotEmpty()) {
-                for (rDate in event.rDates)
-                    AndroidTimeUtils.androidifyTimeZone(rDate)
+                // ignore RDATEs when there's also an infinite RRULE [https://issuetracker.google.com/issues/216374004]
+                val infiniteRrule = event.rRules.any { rRule ->
+                    rRule.recur.count == -1 &&  // no COUNT AND
+                    rRule.recur.until == null   // no UNTIL
+                }
+
+                if (infiniteRrule)
+                    Ical4Android.log.warning("Android can't handle infinite RRULE + RDATE [https://issuetracker.google.com/issues/216374004]; ignoring RDATE(s)")
+                else {
+                    for (rDate in event.rDates)
+                        AndroidTimeUtils.androidifyTimeZone(rDate)
 
-                // Calendar provider drops DTSTART instance when using RDATE [https://code.google.com/p/android/issues/detail?id=171292]
-                val listWithDtStart = DateList()
-                listWithDtStart.add(dtStart.date)
-                event.rDates.addFirst(RDate(listWithDtStart))
+                    // Calendar provider drops DTSTART instance when using RDATE [https://code.google.com/p/android/issues/detail?id=171292]
+                    val listWithDtStart = DateList()
+                    listWithDtStart.add(dtStart.date)
+                    event.rDates.addFirst(RDate(listWithDtStart))
 
-                builder.withValue(Events.RDATE, AndroidTimeUtils.recurrenceSetsToAndroidString(event.rDates, allDay))
+                    builder.withValue(Events.RDATE, AndroidTimeUtils.recurrenceSetsToAndroidString(event.rDates, allDay))
+                }
             } else
                 builder.withValue(Events.RDATE, null)