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Learning RxJava 2 for Android by example

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Get the complete RxJava Course here

How to use RxJava 2 in Android Application

How to migrate from RxJava 1.0 to RxJava 2.0

This project is for :

  • who is migrating to RxJava 2
  • or just started with RxJava.

Just Build the project and start learning RxJava by examples.

RxJava 2.0 has been completely rewritten from scratch on top of the Reactive-Streams specification. The specification itself has evolved out of RxJava 1.x and provides a common baseline for reactive systems and libraries.

Because Reactive-Streams has a different architecture, it mandates changes to some well known RxJava types.

Migration From RxJava 1.0 to RxJava 2.0

To allow having RxJava 1 and RxJava 2 side-by-side, RxJava 2 is under the maven coordinates io.reactivex.rxjava2:rxjava:2.x.y and classes are accessible below io.reactivex.

Users switching from 1.x to 2.x have to re-organize their imports, but carefully.

Using RxJava 2.0 Library in your application

Add this in your build.gradle

compile 'io.reactivex.rxjava2:rxjava:2.1.1'

If you are using RxAndroid also, then add the following

compile 'io.reactivex.rxjava2:rxandroid:2.0.1'

RxJava 2 Examples present in this sample project

  • RxJava 2.0 Example using CompositeDisposable as CompositeSubscription and Subscription have been removed.

  • RxJava 2 Example using Flowable.

  • RxJava 2 Example using SingleObserver, CompletableObserver.

  • RxJava 2 Example using RxJava2 operators such as map, zip, take, reduce, flatMap, filter, buffer, skip, merge, concat, replay, and much more:

  • RxJava 2 Android Samples using Function as Func1 has been removed.

  • RxJava 2 Android Samples using BiFunction as Func2 has been removed.

  • And many others android examples

Quick Look on few changes done in RxJava2 over RxJava1

RxJava1 -> RxJava2

  • onCompleted -> onComplete - without the trailing d
  • Func1 -> Function
  • Func2 -> BiFunction
  • CompositeSubscription -> CompositeDisposable
  • limit operator has been removed - Use take in RxJava2
  • and much more.

Operators :

  • Map -> transform the items emitted by an Observable by applying a function to each item
  • Zip -> combine the emissions of multiple Observables together via a specified function and emit single items for each combination based on the results of this function
  • Filter -> emit only those items from an Observable that pass a predicate test
  • FlatMap -> transform the items emitted by an Observable into Observables, then flatten the emissions from those into a single Observable
  • Take -> emit only the first n items emitted by an Observable
  • Reduce -> apply a function to each item emitted by an Observable, sequentially, and emit the final value
  • Skip -> suppress the first n items emitted by an Observable
  • Buffer -> periodically gather items emitted by an Observable into bundles and emit these bundles rather than emitting the items one at a time
  • Concat -> emit the emissions from two or more Observables without interleaving them
  • Replay -> ensure that all observers see the same sequence of emitted items, even if they subscribe after the Observable has begun emitting items
  • Merge -> combine multiple Observables into one by merging their emissions
  • SwitchMap -> ransform the items emitted by an Observable into Observables, and mirror those items emitted by the most-recently transformed Observable

Highlights of the examples :


  • Many examples are to be added

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   Copyright (C) 2016 Amit Shekhar
   Copyright (C) 2011 Android Open Source Project

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   See the License for the specific language governing permissions and
   limitations under the License.

Contributing to RxJava 2 Android Samples

Just make pull request. You are in!