How do we change PagingSource dynamically in Pager...

# android

[Sergio C.]

How do we change PagingSource dynamically in Pager? I need to collect from one Flow and when searching/filtering select another flow

[eneim]

You can feed only one Flow to the Adapter right? IIRC PagingSource allows you to filter/map/transform it.

[Mihail Ya]

val filterStateFlow = MutableStateFlow<YourFilter>(...)
val pagedData = filterStateFlow.flatMapLatest { createPagerFlow(filter = it) }

This will switch pager when filterStateFlow changes

[Sergio C.]

I will try it. Thanks

[Sergio C.]

fun getAllOrdersByMobileNumber(number: String): Flow<PagingData<Order>> {
    return Pager(config = pagingConfig) {
        dao.getOrdersByNumber("%$number%")
    }.flow.cachedIn(viewModelScope)
}

fun getAllOrders(): Flow<PagingData<Order>> {
    return Pager(config = pagingConfig) {
        dao.getAllOrders()
    }.flow.cachedIn(viewModelScope)
}

[Sergio C.]

I have this feeding the recyclerview paging adapter

[Sergio C.]

number changes by LiveData.

[Sergio C.]

PagingData comes from Room database

[Sergio C.]

in the activity I observe the number LiveData change, then I have to cancel the previous Job and lauch another Job to observe the new Flow. Which seems very verbose to me.

[Sergio C.]

alright it works creating to PagingSource inside the Pager I though I had to recreate everything