NullPointerException

[rovercoder]

So before 1st March the sample project provided was not crashing. It works if I change the device time to 29 Feb. Any ideas?

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Method: mockList(List eventList)

Line: BaseCalendarEvent event1 = new BaseCalendarEvent("Thibault travels in Iceland", "A wonderful journey!", "Iceland",
ContextCompat.getColor(getActivity(), R.color.orange_dark), startTime1, endTime1, true);

Error: Method threw 'java.lang.NullPointerException' exception. Cannot evaluate com.github.tibolte.agendacalendarview.models.BaseCalendarEvent.toString()

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Edit: Apparently the problem above does not have to do with this particular issue

[Tibolte]

@nathanzahra Could you copy the whole stacktrace here if possible?

[rovercoder]

03-02 15:21:24.259 26787-26787/com.project E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project, PID: 26787
java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
at java.util.ArrayList.get(ArrayList.java:310)
at com.github.tibolte.agendacalendarview.CalendarManager.getLastMonth(CalendarManager.java:319)
at com.github.tibolte.agendacalendarview.CalendarManager.addWeekToLastMonth(CalendarManager.java:314)
at com.github.tibolte.agendacalendarview.CalendarManager.buildCal(CalendarManager.java:218)
at com.github.tibolte.agendacalendarview.AgendaCalendarView.init(AgendaCalendarView.java:193)
at com.project.fragment.CalendarFragment.initCalendar(CalendarFragment.java:75)
at com.project.fragment.CalendarFragment.onCreateView(CalendarFragment.java:54)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1106)
at android.support.v4.view.ViewPager.populate(ViewPager.java:952)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1474)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17559)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:940)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17559)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17559)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
at android.view.View.measure(View.java:17559)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2027)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1185)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1391)
at android.view.ViewRootImpl.doTraversal(ViewRootImp

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I think the problem is with Calendar mWeekCounter inside CalendarManager. The MONTH variable is set to 0 in mWeekCounter.setTime(mMinCal.getTime()); and so this fails

if (tmpMonth != mWeekCounter.get(Calendar.MONTH)) { // tmpMonth = 0
        MonthItem monthItem = new MonthItem(mWeekCounter.get(Calendar.YEAR), mWeekCounter.get(Calendar.MONTH));
        getMonths().add(monthItem);
}

and the month does not get added, so later when retrieving it from addWeekToLastMonth(weekItem);

private MonthItem getLastMonth() {
        return getMonths().get(getMonths().size() - 1);
}

it throws a NullPointerException.

Still trying to get to the bottom of it.

2nd Mar

mWeekCounter = java.util.GregorianCalendar[time=1451657510195,areFieldsSet=true,lenient=true,zone=Europe/Malta,firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2016,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=1,DAY_OF_YEAR=1,DAY_OF_WEEK=6,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=3,HOUR_OF_DAY=15,MINUTE=11,SECOND=50,MILLISECOND=195,ZONE_OFFSET=3600000,DST_OFFSET=0]

29th Feb

mWeekCounter = java.util.GregorianCalendar[time=1448980910147,areFieldsSet=true,lenient=true,zone=Europe/Malta,firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2015,MONTH=11,WEEK_OF_YEAR=49,WEEK_OF_MONTH=1,DAY_OF_MONTH=1,DAY_OF_YEAR=335,DAY_OF_WEEK=3,DAY_OF_WEEK_IN_MONTH=1,AM_PM=1,HOUR=3,HOUR_OF_DAY=15,MINUTE=41,SECOND=50,MILLISECOND=147,ZONE_OFFSET=3600000,DST_OFFSET=0]

[avgurf]

thats the case:
http://stackoverflow.com/questions/344380/why-is-january-month-0-in-java-calendar

[rovercoder]

The source on GitHub seems to have tackled this issue already. It is newer than the library available at maven. I managed to get it to work by copying over the library module from source, downgrading java from 1.8 to 1.7, and importing it into my project. Thanks