Hey everyone I ve been trying to find a way to reverse the o kotlinlang #android

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Title

s

Schadenfreude

10/17/2019, 12:44 PM

Hey, everyone, I’ve been trying to find a way to reverse the order of the items in a paged list (or its data source) but I’m having 0 luck and can’t find any articles on how to do that. Does anyone know a way to achieve this?

a

Alexander

10/17/2019, 12:50 PM

Something like this?

LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
myRecyclerView.setLayoutManager(linearLayoutManager);

s

Schadenfreude

10/17/2019, 1:01 PM

Sadly I’m using a GridLayoutManager so setStackFromEnd is not applicable :S

I’m currently using Paging Library with Room DB, my query looks like this:

@Query("SELECT * from NOTES ORDER BY creationDate DESC")
    fun getAllNotesDesc(): DataSource.Factory<Int, Note>

I tried a switch/case for DESC/ASC sort, but that also doesn’t work.

I also tried sorting the PagedList before submitting it to the Adapter, but I get an exception, it seems the PagedList is immutable.

s

Shahjahan

10/17/2019, 1:08 PM

GridLayoutmanager is child class of linearlayout manager so this method be available for grid layout manager as well

s

Schadenfreude

10/17/2019, 2:25 PM

java.lang.UnsupportedOperationException: GridLayoutManager does not support stack from end. Consider using reverse layout

and only using reverse layout doesn’t have the desired effect

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