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To create this workflow of data streams and objects that react to them, RxJava extends the Observer software design pattern. For example, widgets in SWT and Android have to be updated from the UI thread and reactive programming provides ways to run observables. In the Android world, a cold observable can be a network call that doesn't fetch ( or emit) data if no one is subscribed to it. RxJava 2 Android Examples - Migration From RxJava 1 to RxJava 2 - How to use RxJava 2 in Android - amitshekhariitbhu/RxJava2-Android-Samples. This module adds the minimum classes to RxJava that make writing reactive components in Android applications easy and hassle-free. If you're an Android developer, chances are you've heard of RxJava.