You could use the liveData
builder to collect the Flow's values into a MutableList.
Here I copy the MutableList using toList()
before emitting it since RecyclerView Adapters don't play well with mutable data sources.
val scanResults: LiveData<List<BleScanResult>> = liveData {
val cumulativeResults = mutableListOf<BleScanResult>()
scanEnabled.flatMapLatest { doScan ->
if (doScan) {
repository.bluetoothScan().map { BleScanResult(it.device.name, it.device.address) }
} else {
emptyFlow()
}
}.collect {
cumulativeResults += it
emit(cumulativeResults.toList())
}
}
If you want to avoid duplicate entries and reordering of entries, you can use a set like this:
val scanResults: LiveData<List<BleScanResult>> = liveData {
val cumulativeResults = mutableSetOf<BleScanResult>()
scanEnabled.flatMapLatest { doScan ->
if (doScan) {
repository.bluetoothScan().map { BleScanResult(it.device.name, it.device.address) }
} else {
emptyFlow()
}
}.collect {
if (it !in cumulativeResults) {
cumulativeResults += it
emit(cumulativeResults.toList())
}
}
}
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