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UseMultipleChannels

README.md

React Native Use Multiple Channel Events Sample

A React Native project that uses the Node.js for Mobile Apps React Native plugin plugin to showcase using multiple channel events.

In this sample, the Node.js engine runs in a background thread inside the app and the UI provides buttons to test channel features and an area to show the resulting log:

  • Send Echo : Sends a node-echo event that node will send back to react-native through a message event.
  • Toggle Echo : Uses a control event to turn the listening of node-echo events on and off in the node runtime. No node-echo event messages will be returned while that listener is turned off.
  • Add listener : Adds an additional listener to the message events in the UI.
  • Remove listener : Removes one of the additional listeners added to the message events in the React Native runtime.
  • Send types: Sends many different messages with different types to the node runtime.
  • Receive types: Uses a control event to ask node to send many different messages with different types to the React Native runtime.
  • Write file: Uses a test-file event to ask node to write a file in a writable path.

Note: The node runtime will report receiving pause and resume events when the app is paused and resumed, respectively.

How to run

  • Clone this project.
  • Run the required npm and react-native commands to install the required node modules in the project root (react-native/UseMultipleChannels/):
    • $ npm install
    • $ react-native link

iOS

If you want to run the app on a physical device, you'll also have to sign the project.

  • Open the ios/UseMultipleChannels.xcodeproj project file in Xcode.
  • Select one of the physical iOS devices as the run target.
  • In the project settings (click on the project main node), in the Signing portion of the General tab, select a valid Team and let Xcode handle the provisioning profile creation/update. If you get an error that the bundle identifier cannot be used, you can simply change the bundle identifier to a unique string by appending a few characters to it.
  • Run the app. If the build process doesn't start the app right away, you might have to go to Settings>General in the device and enter Device Management or Profiles & Device Management to manually accept the profile.

Android

You may need to open your app's /android folder in Android Studio, so that it detects, downloads and cofigures requirements that might be missing, like the NDK and CMake to build the native code part of the project.

  • Run react-native run-android in the project root (react-native/UseMultipleChannels/).

Troubleshooting

On Android applications, the react-native build process is sometimes unable to rebuild assets. If you are getting errors while building the application using react-native run-android, the following commands can help you do a clean rebuild of the project, when run in the project root (react-native/UseMultipleChannels/).

On Linux/macOS:

cd android
./gradlew clean
cd ..
react-native run-android

Project structure

In nodejs-assets/nodejs-project/main.js you can find the Node.js backend code and in App.js you can find the React Native code.