[MaterialDatePicker] NPE Crash #2242
Description
The material date picker crashes sometimes when preselecting a date range. Code to invoke the datepicker:
private fun launchDatePicker() {
val now = ZonedDateTime.now().toEpochSecond() * 1000
val selectionRange = ArrayList<CalendarConstraints.DateValidator>().apply {
add(DateValidatorPointForward.from(ZonedDateTime.now().minusDays(90).toEpochSecond() * 1000))
add(DateValidatorPointBackward.before(now))
}
val calendarConstraints = CalendarConstraints.Builder()
.setValidator(CompositeDateValidator.allOf(selectionRange))
.setStart(ZonedDateTime.now().minusDays(90).toEpochSecond() * 1000)
.setOpenAt(now)
.setEnd(now)
.build()
val datePicker = MaterialDatePicker.Builder.dateRangePicker()
.setTitleText(getString(R.string.date_range_picker_title))
.setCalendarConstraints(calendarConstraints)
.setSelection(Pair(ZonedDateTime.now().minusDays(7L).toEpochSecond().times(1000), now))
.build()
datePicker.addOnPositiveButtonClickListener { pair: Pair<Long, Long> ->
pair.let {
viewModel.getItemsWithinDateRange(it.first ?: now, it.second ?: now)
}
}
datePicker.show(requireActivity().supportFragmentManager, "date picker")
Crash log:
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getLeft()' on a null object reference
at com.google.android.material.datepicker.MaterialCalendarGridView.horizontalMidPoint(MaterialCalendarGridView.java:242)
at com.google.android.material.datepicker.MaterialCalendarGridView.onDraw(MaterialCalendarGridView.java:156)
at android.view.View.draw(View.java:23901)
at android.widget.AbsListView.draw(AbsListView.java:4988)
at android.view.View.updateDisplayListIfDirty(View.java:22776)
at android.view.View.draw(View.java:23631)
at android.view.ViewGroup.drawChild(ViewGroup.java:5336)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:5093)
at android.view.View.updateDisplayListIfDirty(View.java:22762)
at android.view.View.draw(View.java:23631)
at android.view.ViewGroup.drawChild(ViewGroup.java:5336)
at androidx.recyclerview.widget.RecyclerView.drawChild(RecyclerView.java:5204)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:5093)
at android.view.View.draw(View.java:23904)
at androidx.recyclerview.widget.RecyclerView.draw(RecyclerView.java:4603)
at android.view.View.updateDisplayListIfDirty(View.java:22776)
at android.view.View.draw(View.java:23631)
at android.view.ViewGroup.drawChild(ViewGroup.java:5336)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:5093)
Expected behavior: Not crash. The date picker does show briefly, but then the whole app crashes. Something to do with the preselected/visible date range. Our code preselects the last 7 days up until today.
If I manually set the device date to June 6th (instead of the current day, June 7th), then date picker does not crash and works fine. The same goes for June 8th. Only when the device date is June 7th (today) then date picker crashes. A quick fix would be nice, since this is causing a lot of crashes for users.
Tested on Samsung S20 and Emulator, both Android 11. This happens with both version 1.3.0 and 1.4.0-rc01. Have not tried any other versions/devices. A screenshot of how the date picker looks right before the crash:
