Only one expanded item : how to ?

[engi]

About this issue

Hi Mike,

Question is in the title : how can I have only one expandable item expanded at one time?
I have two expandable items (ids 2 and 3).

I tried this in onDrawerItemClickListener :

2L -> { //dictionnaries item
    val itemBackup: IDrawerItem<*>? = binding?.slider?.getDrawerItem(3L)
    if ((itemBackup != null) && itemBackup.isExpanded) {
        val positionItemBackup: Int = binding?.slider?.itemAdapter!!.getAdapterPosition(3)
        binding?.slider?.expandableExtension!!.collapse(positionItemBackup, true)
    }
}
3L -> { //backups item
    val itemDico: IDrawerItem<*>? = binding?.slider?.getDrawerItem(2L)
    if ((itemDico != null) && itemDico.isExpanded) {
        val positionItemDico: Int = binding?.slider?.itemAdapter!!.getAdapterPosition(2)
        binding?.slider?.expandableExtension!!.collapse(positionItemDico, true)
    }
}

or this :

binding?.slider?.apply {
    addItems(
        alarmDrawerItem,
        dicoDrawerItem,
        backupDrawerItem,
        settingsDrawerItem
    )
    expandableExtension.isOnlyOneExpandedItem = true
    setSavedInstance(savedInstanceState)
}

but it doesn't work !

Details

•  Used library version 8.4.5
•  Used androidX library last version
•  Used Android Studio last version

Checklist

• Searched for similar issues
• Checked out the sample application
• Read the README
• Checked out the CHANGELOG
• Read the FAQ
• Checked out the MIGRATION GUIDE

[mikepenz]

You can retrieve the adapter from the MaterialDrawerSlidingView which exposes a expandableExtension API:

adapter.expandableExtension {
    isOnlyOneExpandedItem = true
}