When should one use RxJava Observable and when simple Callback on Android?

When should one use RxJava Observable and when simple Callback on Android?

android retrofit rx-java

android

Observable vs Flowable rxJava2

java android rx-java

android

Get response status code using Retrofit 2.0 and RxJava

android retrofit rx-java android-networking rx-android

android

Retrofit with Rxjava Schedulers.newThread() vs Schedulers.io()

android retrofit rx-java rx-android

android

Kotlin: Whats does "return@" mean?

android rx-java kotlin

android

Rxandroid What's the difference between SubscribeOn and ObserveOn

java android rx-java rx-android rx-java2

android

How to use CompositeDisposable of RxJava 2?

java android rx-java rx-java2 rx-android

android

Android RxJava 2 JUnit test - getMainLooper in android.os.Looper not mocked RuntimeException

android unit-testing junit rx-java rx-java2

android

RxJava: How to convert List of objects to List of another objects

java android rx-java

android

What is the difference between EventBus and RxJava? [duplicate]

android rx-java event-bus

android

How to ignore error and continue infinite stream?

android rx-java rx-android

android

How to create a retrofit.Response object during Unit Testing with Retrofit 2

android unit-testing mockito retrofit rx-java

android

Why is RxJava often used with Retrofit?

android retrofit rx-java retrofit2

android

Subscribewith Vs subscribe in RxJava2(Android)?

android rx-java reactive-programming rx-java2

android

What is CompositeDisposable in RxJava

android rx-java

android