SingleLiveEvent issue after migration to AndroidX

Question

After migration to AndroidX by using Android studio 3.2.1 I cannot run app due to this error:

SingleLiveEvent.java:29: error: name clash: observe(LifecycleOwner,Observer<T#1>) in SingleLiveEvent and observe(LifecycleOwner,Observer<? super T#2>) in LiveData have the same erasure, yet neither overrides the other
    public void observe(LifecycleOwner owner, final Observer<T> observer) {
                ^
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in class SingleLiveEvent
    T#2 extends Object declared in class LiveData
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

I googled it, and found solutions for other things, but how to solve this elegantly? I don't want to refactor whole app in every place I use single live event.

Answer 1

I have found the issue. LiveData provides this:

public void observe(@NonNull LifecycleOwner owner, @NonNull Observer<? super T> observer)

while SingleLiveEvent provides:

public void observe(LifecycleOwner owner, final Observer<T> observer)

The solution is to change the method signature in SingleLiveEvent to match LiveData