title: How to observe when fragments initialized RxJava/RxAndroid?
body: <p>I have two fragments and each of them have Publish Subject that on initialization call onNext(true) in onResume(). I want to combine these two Subjects and call some method in third class when they both return true. Do i need to use Observable for this? I cannot find appropriate operation, zip does not work because these are Subjects. How can i combine these?</p>