react-native-context-execute

Execute JS code in React Native's context even when RN is inactive (eg. app in background).

In Android, where background services are indispensable, keeping RN in sync can be hard since RN doesn't stay active in background. Currently, Android-only.

A tiny library which registers a JavascriptModule in RN's JavascriptModuleRegistry and makes Catalyst (Bridge) run it.

Before using this, please note that HeadlessJS is another good way to go.

Getting started

$ npm install react-native-context-execute --save

Mostly automatic installation

$ rnpm link react-native-context-execute

Manual installation

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.reactlibrary.RNContextExecutePackage; to the imports at the top of the file
• Add new RNContextExecutePackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-context-execute'
   project(':react-native-context-execute').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-context-execute/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-context-execute')
   

Usage

In your Java side, grab hold of the ReactApplicationContext and do,

1WritableMap payload = Arguments.createMap();
2payload.putString("some_key", "some_value");
3
4new ReactContextExecutor(reactApplicationContext).execute("some_other_key", payload);

In JS side,

1import { ContextExecute } from 'react-native-context-execute';
2
3ContextExecute((op, data) => {
4    // Do your thing
5});
6