RxRNBridge

RxJava Observable bridge for React Native

Introduction

React Native supports callbacks or promise from native java code.

RxRNBridge as a helper further supports RxJava observables and user don't need to do type convert handy.

RxRNBridge is good for Android legacy code and leverage original RxJava ecosystem's powerful and start new UI view by React Native.

Usage

Simply add @ReactMethodObservable annotation to Observable returned methods.

@ReactMethodObservable
public Observable<String> foo() { ... }

Now these methods will be wrapped as js functions with callback. (i.e. foo(errorCallback, successCallback)) You could encapsulate callback as Promise.

var SampleModule = {
  foo: function(): Promise {
    return new Promise((resolve, reject) => {
      RNSampleModule.foo(
        (error) => {
          reject(error);
        }, (val) => {
          resolve(val);
        });
    });
  }
};

Installation

• build.gradle

...
apply plugin: 'com.neenbedankt.android-apt'

repositories {
    jcenter()
}

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
    	...
    	classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
    }
}

compile 'com.github.kudo:rxrnbridge:0.0.1'
apt 'com.github.kudo:rxrnbridge-compiler:0.0.1'
    

• YourNativePackage.java

New a module instance by RxRNBridge.newInstance(YourNativeModule.class, reactContext);

E.g.

List<NativeModule> modules = new ArrayList<>();

NativeModule module = RxRNBridge.newInstance(RNSampleModule.class, reactContext);
modules.add(module);
...
return modules;

Known issues

1. React Native callbacks/promise could only trigger once. Therefore, continuous event such as Observable.timer() will make problems.

TODO

• Add natived supported Promise after RN release this feature
• Decouple RN dependency by gradle optional or shipping with npm / #3267
• Fix for RN annotation package changes

Special thanks

• @ChenNevin for share me with Android development and Java annotation processing
• ButterKnife for structure and sample for annotation processor

License

Copyright (c) 2015, Kudo Chien
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

* Neither the name of RxRNBridge nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.