Hi guys. I have the following code below, why my c...

# android

[Ayden]

Hi guys.
I have the following code below, why my chart result always render before LiveData?

private fun getVoteData(): ArrayList<PieEntry> {
    ...
    val viewModel = ViewModelProvider(this, voteViewModelFactory).get(VoteViewModel::class.java)
    val liveData = viewModel.getVote()
    liveData.observe(viewLifecycleOwner, { vote ->
        vote.forEach {
            votes.add(PieEntry(it.total.toFloat(), it.name))
        }
    })
    return votes
}

private fun generateChart(binding: FragmentPieChartBinding, getVoteData: ArrayList<PieEntry>) {
    ...

    // Run before livedata execute
    Log.d("TEST", votes.toString())

    ...
    // Render chart result
}

[coroutinedispatcher]

Which result? Can you be more specific?

[Anshulupadhyay03]

what are you doing with getVote() what does it do inside?

[Ayden]

I want to render a chart based on the data retrieve from getVoteData() function.

[Ayden]

But now my chart always render before getVoteData return the value.

[dawidhyzy]

www.stackoverflow.com

[Nikola Minoski]

consider using MediatorLiveData like:

val votesMediator = MediatorLiveData<..>()
votesMediator.addSource(viewModel.getVote()) {votes ->
    votesMediator.psotValue(votes.map { PieEntry(it.total.toFloat(), it.name) })
}

and do votesMediator.observe(.. in fragment/activity onCreate or use votesMediator with data-binding