Cannot invoke setValue on a background thread

Question

Can someone tell me what I am doing wrong

private fun getTorrentsSocketIO() {
    coroutineScope.launch {
        try {
            val socket = IO.socket("...")
            socket.on("torrents") {
                val jsonString = it.toList() as List<Torrent>
                _torrents.value = jsonString
            }
            socket.connect()
        } catch (t: Throwable) {
            Log.i("LIST_VIEW_MODEL", t.message.toString())
        }
    }
}

Error is thrown when the following is called

_torrents.value = jsonString

Arda Kazancı · Accepted Answer · 2020-09-16T11:24:58.100

14

You should use the postValue.

SetValue will not work for background processes.

Info

This method(setValue) must be called from the main thread. If you need set a value from a background thread, you can use postValue(Object)

edited Sep 16 '20 at 11:24

answered Sep 16 '20 at 11:19

Arda Kazancı

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Where am I using setValue? – Gregor A Sep 16 '20 at 11:20
Thank you. I am now getting java.lang.String cannot be cast to com.example.torrentula.network.Torrent – Gregor A Sep 16 '20 at 11:23
Gregor A: In my case I call setValue when try set the value of a mutable live data. – moralejaSinCuentoNiProverbio Jun 09 '23 at 15:46

Cannot invoke setValue on a background thread

1 Answers1