Wondering if someone could explain the difference between the suspending functions, `Lifecycle.whenR...

# android

[Bradleycorn]

Wondering if someone could explain the difference between the suspending functions, Lifecycle.whenResumed vs Lifecyle.withResumed? .. it seems like they both work the same way?

[Robert Williams]

See related answer here https://stackoverflow.com/questions/67135701/difference-between-withstateatleast-and-whenstateatleast-lifecycle-extension-met

[Umar Ata]

whenResumed


withResumed

[Bradleycorn]

@Robert Williams thanks for the stackoverflow link. That helps!

[Adam Powell]

that stackoverflow answer is incorrect in a key way: the with* methods accept blocks that cannot suspend, so the case the SO answer describes about resuming from suspension not guaranteeing lifecycle state can't happen

[Adam Powell]

the when* methods are a source of bugs that we should have deprecated a long time ago. Since they use a pausing dispatcher that doesn't run continuations outside of lifecycle and instead defers them, that means that things like exception handling, notably CancellationExceptions, are also deferred until you're back in lifecycle again or the lifecycle is destroyed

[Adam Powell]

in the kind of code people write with coroutines today this can mean things like your flows keep collecting in the background when you're not expecting it, still performing potentially expensive work

[Adam Powell]

the with* methods explicitly replace them with safer alternatives, alongside repeatOnLifecycle

[Colton Idle]

need https://adamoverflow.com