[Question] How to keep some items after canceling filter or search text returns empty?

[mdtuyen]

I custom some AbstractModelItem to make Header same your LayoutItem or ULSItem and put to recyclerview.

When search these item not filter so that them will disappear but I want to show them when I cancel search or clear search.

Please help me make it.
Thanks,

[mdtuyen]

Hi @davideas , I saw that when I cancel search filterItems on Item not call, data will restore but not include header so that have no these header.

[kasterlod]

Just use it in header item to have effect you want:

@OverRide
public boolean filter(String constraint) {
return false;
}

[mdtuyen]

I understand when item filter() function return false it will not apear (but when constraint is empty this function not call). because adapter.filterItem(data, delay), data not include header. why header will appear when constaint is empty ?

[kasterlod]

data should contains headers and items , new Array, if you write empty constraint or clear search then
onQueryTextChange(String newText) should call

[mdtuyen]

there are some special header need add not same other element as ULSItem, LayoutItem (NO HeaderItem) in demo, it not filter and restore when cancel filter.

[davideas]

@mdtuyen, I executed some tests. So, if I understood well, you want some items added when the filter is reset, after a search is cleared out?

Currently the filter is asynchronously, it means that, it is executed after the caller method is completed. Indeed, if you add items or modify the adapter list, this is executed before the filter. The thread for the filter, with the unfiltered list, will overwrite any modification to the main list!
In the old version of the demo app, I added some new items like ULSItem, LayoutItem after the search is cleared. Now having the filter asynchronous those items are not present anymore due to the above behavior.

Now some ideas:

• Filter has to remain asynchronous.
• I can add 2 new methods onPostFilter and onPostUpdate so User can override them and correctly modify the list after the async execution.

I will restore this feature, I consider this as an enhancement.
You will need to wait until next snapshot version.

[davideas]

@mdtuyen, I published a new Snapshot with these 2 methods, can you try now?
I don't know if it's better to override these 2 methods (by extending FlexibleAdapter) or maybe having new listeners to implement inside the Activity/Fragment.