how did you get the 279 item data? can you get only 20 of them then next time another 20? or you have to get them all in one batch?
actually my users give their information and that is a list .. so there are now 310 users so 310 lists and when user click on the button the app shows all the 310 lists in cards. So i want to show first 20 lists then when he reached bottom then another 20 lists
so where is the data store at? tinywrbdb? clouddb? firebase? google sheet? MySQL?
firebase
how you retrieve your data? each record in one tag? or all record in one tag?
Show example data structure for a user
Show your relevant blocks
all record in a variable then show using cards
blocks not completed.
Show your data structure in firebase.
then you can pick item from 1 to 20 from the variable and show as card.
Then get 21 to 40.
You need a global variable to record the index now showing.
but how ? i do not know how to pick up 20 data then 20 .. pls give me some idea
Use lists...iterate over numbers while selecting the user with the number and displaying the data...
Can you also show what a single card looks like in the app?
Why not use the Recycler Listview extension for this?
you know how to show all cards from list, but don't know how to show first 20? 
No sir
For your info: preferred not preffered 
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Thank you sir....as a lot of thing are going on its just skipped and its natural human error 