Section headers are not visible

I’ve tried to implement sticky section headers using the first use case provided in the documentation at https://github.com/davideas/FlexibleAdapter/wiki/5.x-|-Headers-and-Sections. I’m adding only AppointmentItems to the list and calling updateDataSet(list). In the fragment I’m calling adapter.setDisplayHeadersAtStartUp(true).

As far sa I can tell, I think everything seems ok. However, headers are not showing up, only the items. Am I missing something?

class MyAdapter: FlexibleAdapter<AbstractFlexibleItem<FlexibleViewHolder>>(ArrayList())
{
    inner class AppointmentItem(
        private var sectionItem: SectionItem?,
        var appointment: AppointmentViewModel) : AbstractFlexibleItem<AppointmentViewHolder>(),
                                                 ISectionable<AppointmentViewHolder, SectionItem>
{
override fun getHeader(): SectionItem?
        {
            return sectionItem
        }
        
        override fun setHeader(header: SectionItem?)
        {
            this.sectionItem = header
        }

override fun equals(other: Any?): Boolean
        {
            return other is AppointmentItem && other === this
        }
        
        override fun hashCode(): Int
        {
            var result = sectionItem?.hashCode() ?: 0
            result = 31 * result + appointment.hashCode()
            return result
        }
}
  inner class SectionItem(
        var startDate: Date?,
        var endDate: Date?) :
        AbstractExpandableHeaderItem<SectionViewHolder, AppointmentItem>()
{
 override fun equals(other: Any?): Boolean
        {
            return other is SectionItem && other === this
        }
        
        override fun hashCode(): Int
        {
            var result = startDate?.hashCode() ?: 0
            result = 31 * result + (endDate?.hashCode() ?: 0)
            return result
        }
}
}

[tcqq]

@bogdanzurac This is an example that supports displaying sticky titles, you can take a look. https://github.com/tcqq/FlexibleAdapterStickyHeaderExample

[bogdanzurac]

Then I suppose we should use the 2nd solution in our use case, which indeed works perfectly. Thanks for clearing things up!