Example React Native Android, iOS, Web, and Electron app

This is an example React Native Expo App supporting Android, iOS, Web, and Electron desktop apps.

Prerequisites

1. brew cask install adoptopenjdk/openjdk/adoptopenjdk8 android-studio ngrok

2. yarn install

3. (Optional) Open Android Studio

   1. Follow the wizard to create a blank project
   2. Wait for the app to finish building
   3. Click Build > Generate Signed Bundle / APK > Next > Create new...
   4. Enter some application details and save as keystore.jks in this folder

4. (Optional) Open Xcode

   1. Click Xcode > Preferences
   2. Click Account, add an Apple account
   3. Manage Certificates... > Generate a new developer certificate

5. (Optional) For production apps:

   cat >> .env <<EOL
   # Replace <var> with your details from steps above
   # Deployed `dist` folder or run `yarn serve:dist` to do this automatically
   export EXPO_APP_PUBLIC_URL="https://<Your ID>.ngrok.io"
   # Deployed `dist-electron` folder or run `yarn serve:electron:dist` to do this automatically
   export EXPO_ELECTRON_PUBLIC_URL="https://<Your ID>.ngrok.io"
   # From Android Studio step above
   export EXPO_ANDROID_KEYSTORE_PASSWORD="<Your 1st Password>"
   export EXPO_ANDROID_KEY_PASSWORD="<Your 2nd Password>"
   export EXPO_ANDROID_KEYSTORE_ALIAS="<Your Key Alias e.g key0>"
   EOL
   

Running development apps

For Android, iOS, and Web:

yarn start

For the Electron desktop app:

yarn electron

Building production apps with auto updates

Build Android APK:

# First tab (if `dist` folder is not deployed online)
yarn serve:dist

# Update `.env` file with displayed ngrok domain

# Second tab, outputs APK to: `~/expo-apps`
yarn android:build

# Copy to phone and install check that it works, then bump the version number in `package.json`
yarn build

# Relaunch the app, check ngrok logs to see if app it downloading the latest bundle, restart app to apply update

Build Electron desktop app:

# First tab: to serve the `dist-electron` folder (if not deployed online)
yarn serve:electron:dist

# Second tab, outputs to: `dist/mac`
yarn electron:build:packed

# Install via the `dmg` file, bump the version number in `package.json` and rerun the `electron:build:packed` command above

# Watch the update being downloaded via
/Applications/react_native_android_ios_web_electron.app/Contents/MacOS/react_native_android_ios_web_electron

Build Web app:

# Outputs to: `web-build`
yarn web:build

# Run server
yarn serve web-build