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RxJava bindings for Android

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RxAndroid: Reactive Extensions for Android

Android specific bindings for RxJava 3.

This module adds the minimum classes to RxJava that make writing reactive components in Android applications easy and hassle-free. More specifically, it provides a

that schedules on the main thread or any given


Since RxAndroid is part of the RxJava family the communication channels are similar:


allprojects {
    repositories {
        maven { url "" }

dependencies { implementation 'io.reactivex.rxjava3:rxandroid:3.0.0' // Because RxAndroid releases are few and far between, it is recommended you also // explicitly depend on RxJava's latest version for bug fixes and new features. // (see for latest 3.x.x version) implementation 'io.reactivex.rxjava3:rxjava:3.0.0' }

  • RxAndroid:
  • RxJava:

Additional binaries and dependency information for can be found at


To build:

$ git clone [email protected]:ReactiveX/RxAndroid.git
$ cd RxAndroid/
$ ./gradlew build

Further details on building can be found on the RxJava Getting Started page of the wiki.

Sample usage

A sample project which provides runnable code examples that demonstrate uses of the classes in this project is available in the


Observing on the main thread

One of the most common operations when dealing with asynchronous tasks on Android is to observe the task's result or outcome on the main thread. Using vanilla Android, this would typically be accomplished with an

. With RxJava instead you would declare your
to be observed on the main thread:
Observable.just("one", "two", "three", "four", "five")
    .subscribe(/* an Observer */);

This will execute the

on a new thread, and emit results through
on the main thread.

Observing on arbitrary loopers

The previous sample is merely a specialization of a more general concept: binding asynchronous communication to an Android message loop, or

. In order to observe an
on an arbitrary
, create an associated
by calling
Looper backgroundLooper = // ...
Observable.just("one", "two", "three", "four", "five")
    .subscribe(/* an Observer */)

This will execute the Observable on a new thread and emit results through

on whatever thread is running

Bugs and Feedback

For bugs, feature requests, and discussion please use GitHub Issues. For general usage questions please use the mailing list or StackOverflow.


Copyright 2015 The RxAndroid authors

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, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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