I want to display an image for 3 seconds while also fetching

Question

I want to display an image for 3 seconds while also fetching serializing and persisting a large JSON blob Keeping in mind the whole operation could take more than 3 seconds on slow network this is what I have right now ```viewmodelScope launch val deferredFetchAndPersist = async some suspend fun val deferredTimer = async delay 3000 awaitAll deferredFetchAndPersist deferredTimer hideImageView ``` This works but I feel it s a little too verbose Is there a better way I can achieve this Thanks

Erik · Answer

What if the operation takes less than 3 seconds Right now you d also await the timer for 3 seconds anyways If that s not what you want then cancel the timer on completion of the operation And do you intend to show the image for more than 3 seconds if the operation takes more than that Other than that this seems fine

Stanley Gomes · Answer

The requirement is to show the image for at least 3 seconds and yes for your 2nd question If this seems fine then thanks

uli · Answer

looks fine to me You could also use `coroutineScope ` and use `launch` instead of `async`and `awaitAll`

uli · Answer

```viewmodelScope launch coroutineScope launch fetchAndPersist launch delay 3000 hideImageView ```

uli · Answer

Well actually you should use launch if you don t expect a result When structured concurrency does not come handy you can also `joinAll` the `Job`s returned from `launch` instead of calling `awaitAll`on the `Deferred lt Unit gt `s

bezrukov · Answer

another option would be to write it in sequential way which is probably looks simpler in this particular case ```delay 3000 measureTimeMillis yourSuspendFun hideImageView ``` delay works fine with negative arguments so everything should work regardless if yourSuspendFun faster slower than 3s

Erik · Answer

Wow that s pretty effective and pretty difficult to understand as a reader clap But that s arguable

Erik · Answer

Maybe actually write it sequentially on multiple lines and optionally with named values to increase readability ```val actualMillis = measureTimeMillis yourSuspendFun val minimumMillis = 3000 delay minimumMillis actualMillis hideImageView ```

Stanley Gomes · Answer

I like it Thanks for all the suggestions everyone pray