Kotlin 中 globalScope 、 cooruntineScope 和 viewScope 之间的区别

Question

What is the difference between globalScope , coroutineScope and viewModelScope and when to use them inside Kotlin programming with viewModelScope still under development?

I have gone through below link https://medium.com/androiddevelopers/coroutines-on-android-part-iii-real-work-2ba8a2ec2f45

I know corountineScope will be having scope until {} for which it was called. Also we have supervisorScope which is similar to coroutineScope , viewModelScope having scope till ViewModel . Global scope - does it have till application works or activity ?

Answer 1

GlobalScope is a singleton scope that returns a completely empty coroutineContext . Since there's no Job associated with it, you cannot cancel it, so its lifecycle is basically "forever".

A separate instance of viewModelScope is attached to every instance of ViewModel . It runs out when the ViewModel is destroyed.

coroutineScope and supervisorScope are suspendable functions that establish their own local scope, run the block you pass to them within that scope, and return when all the work inside is done, including all the coroutines launched within their scope.