How to add firebase list data in to Custom List Viewer or other list viewer element randomly

hy guys.i want to add data randomly from firebase into list viewer (Custom List Viewer)

if i open list viewer for the first time
first list item is 5 and second is 2
when i open viewer for the second time
first item will be 2 and second will 5


List item always shown in same pattern

I just want to add item randomly in Custom List View from firebas

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