Hey guys. Can someone know how to update list in MutableStateFlow . When I am adding more value, my ...

# android

[Vivek Modi]

Hey guys. Can someone know how to update list in MutableStateFlow . When I am adding more value, my previous value will drop. Please someone guide me

[Vivek Modi]

https://stackoverflow.com/q/70699636/11560810

[Zach Klippenstein (he/him) [MOD]]

Looks like you’re creating an empty list, populating it with the date range query results, then updating the state value. If the date range is different, and that produces a different date range query result, wouldn’t that be the expected behavior?

[Vivek Modi]

@Zach Klippenstein (he/him) [MOD] I want to append the new data in the current/existing result every time, when new date range is different

[Zach Klippenstein (he/him) [MOD]]

so you want

prepareMutableStateFlow.value += conversationCount

instead of

prepareMutableStateFlow.value = conversationCount

?

[Zach Klippenstein (he/him) [MOD]]

or alternatively,

val conversationCount = prepareMutableStateFlow.value.toMutableList()
…
prepareMutableStateFlow.value = conversationCount

[Vivek Modi]

Which way do you prefer @Zach Klippenstein (he/him) [MOD]?

[Vivek Modi]

I am learning this mutableStateFlow so i don't know

[Zach Klippenstein (he/him) [MOD]]

this isn’t a mutable state flow issue, the same thing would apply if it were just a regular var

[Zach Klippenstein (he/him) [MOD]]

i don’t really have a strong preference either way, the point is that if you want to append to the list, you need to append to the list 😉

[Vivek Modi]

@Zach Klippenstein (he/him) [MOD] one thing after using this prepareMutableStateFlow.value = conversationCount + prepareMutableStateFlow.value my recylerview jumps scroll to few page

[gildor]

It’s not directly related on shared flow, but rather on how you recycler view is implemented, you can check for example Paging library or DiffUtils for recycler view