Repeatative Data in list

[swapnil-mobisoft]

DatabaseReference ref2 = ref1.child("Faces");
ref2.limitToFirst(TOTAL_ITEM_EACH_LOAD)
.startAt(currentPage * TOTAL_ITEM_EACH_LOAD)
.orderByChild("uniqKey")

loadMoreData() method calling every time i scroll down.
my data size is only 20 then also its showing 20+ repeatative data

[PhanVanLinh]

loadMoreData will call when you scroll down to bottom of recyclerview
in my code when loadMoreData called, I will do currentPage++;

You can think the logic must be

Each time you load data, you will load 20 items so

At first time, you will load from item_0 to item_20
At second time, you must load from item_20 to item_40 (in your case there is no item from 20 -> 40)
At third time, ...

You receive duplicate data because you have loaded wrong data (I think at second time, you haved load data from item_0 toitem_20 (not item_20 to item_40))

[swapnil-mobisoft]

Hi, Thanks for giving quick reply. That's what i am saying data getting repeatative because startAt is not working in my case.Even though i sent startAt(20) at second time i am getting value from 0 i.e starting. Regards, Swapnil Jadhav

…

[PhanVanLinh]

So now the problem is about startAt. You should check the firsebase docs for understand how startAt work. Maybe you need to change your firebase database a little bit for able to use startAt ;)
For example, my current querry now is

 mDatabase.child("questions")
                .limitToFirst(TOTAL_ITEM_EACH_LOAD)
                .startAt(currentPage*TOTAL_ITEM_EACH_LOAD)
                .orderByChild("number")

[ShahoodulHassan]

At first time, you will load from item_0 to item_20
At second time, you must load from item_20 to item_40 (in your case there is no item from 20 -> 40)

Still item 20 would be repeated.

[IamHomen]

work fine to me, thanks @PhanVanLinh for your code, i saw this repo on some stackoverflow post 💙