lifecycleScope 的上下文是 SupervisorJob() + Dispatchers.Main.immediate
```
val Lifecycle.coroutineScope: LifecycleCoroutineScope
get() {
while (true) {
val existing = mInternalScopeRef.get() as LifecycleCoroutineScopeImpl?
if (existing != null) {
return existing
}
val newScope = LifecycleCoroutineScopeImpl(
this,
SupervisorJob() + Dispatchers.Main.immediate
)
if (mInternalScopeRef.compareAndSet(null, newScope)) {
newScope.register()
return newScope
}
}
}
- `viewModelScope` 的上下文是 `SupervisorJob() + Dispatchers.Main.immediate`
val ViewModel.viewModelScope: CoroutineScope get() { val scope: CoroutineScope? = this.getTag(JOB_KEY) if (scope != null) { return scope } return setTagIfAbsent(JOB_KEY, CloseableCoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)) }
- `GlobalScope` 的上下文是 `EmptyCoroutineContext`
public object GlobalScope : CoroutineScope { override val coroutineContext: CoroutineContext get() = EmptyCoroutineContext } ```