because i want to do nothing when Firebase callback is calle

Question

because i want to do nothing when Firebase callback is called twice

louiscad · Answer

Completion listener should be called only once What API method is violating that

Kulwinder Singh · Answer

from crashes i have found that Firestore s `addOnSuccessListeneer` is called twice on some devices

Kulwinder Singh · Answer

you can also check this issue <https github com Kotlin kotlinx coroutines issues 48>

louiscad · Answer

I asked which method Firestore is an API not a method

Kulwinder Singh · Answer

`addOnSuccessListener` is called twice on some devices

louiscad · Answer

That s not that generic method I m asking for I m asking for the method returning the `Task` on which you use the `await ` extension function

Kulwinder Singh · Answer

ooh sorry for misunderstanding i m using `get ` something like this `colletion whereEqualTo level level get source await `

louiscad · Answer

Can you link that method

louiscad · Answer

Also could you show the error message when it s supposedly being called twice

Kulwinder Singh · Answer

```Fatal Exception java lang IllegalStateException Already resumed but proposed with update kotlin Unit kotlinx coroutines CancellableContinuationImpl alreadyResumedError CancellableContinuationImpl java 244 kotlinx coroutines CancellableContinuationImpl resumeImpl CancellableContinuationImpl java 239 kotlinx coroutines CancellableContinuationImpl resumeWith CancellableContinuationImpl java 168 MyClass$loadSomethingSuspended$2$1 onLoaded MyClassKt java 94 ```

louiscad · Answer

It s probably that same issue I just opened following me checking the current code <https github com Kotlin kotlinx coroutines issues 1197>

louiscad · Answer

I mentioned two possible workarounds these sould fix your issue

Kulwinder Singh · Answer

thanks < louiscad> for your quick help +1 i think now i only have to use `try catch`

Kulwinder Singh · Answer

i have another solution as well but don t know how good it is ```suspend fun lt T gt Task lt T gt await T var continuation CancellableContinuation lt T gt = null addOnSuccessListener continuation resume it continuation = null addOnFailureListener continuation resumeWithException it continuation = null return suspendCancellableCoroutine continuation = it ```

Kulwinder Singh · Answer

< louiscad> is it safe to use above method

louiscad · Answer

< Kulwinder Singh> It d still crash on post cancellation completation You need to wrap the last line in a try finally and set the continuation variable back to null