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This is basic overview of the whole Smail project. It consists of:

  • Landing (/landing folder)
  • Backend (/gcp_backend folder)
  • Application (root folder)

The Development Process

  1. Ensure you have an access to github (https://github.com/adampackets/Ed) and trello board (https://trello.com/b/0defDRVo/mail-app)
  2. Move the Trello card to Doing
  3. Create a local branch for the feature
  4. Get job done (please commit and push the changes as soon as you make them, don't wait until the whole work is finished)
  5. Check your changes one more time. If you want, ask somebody to review them
  6. Deploy will be done manually every once in a while
  7. Congratulations! Keep going!

Important links:


This is part about application. Later on it will be sorted out properly:

This project was bootstrapped with Create React Native App.

Available Scripts

If Yarn was installed when the project was initialized, then dependencies will have been installed via Yarn, and you should probably use it to run these commands as well. Unlike dependency installation, command running syntax is identical for Yarn and NPM at the time of this writing.

npm start

Runs your app in development mode.

Open it in the Expo app on your phone to view it. It will reload if you save edits to your files, and you will see build errors and logs in the terminal.

Sometimes you may need to reset or clear the React Native packager's cache. To do so, you can pass the --reset-cache flag to the start script:

npm start -- --reset-cache
# or
yarn start -- --reset-cache

npm test

Runs the jest test runner on your tests.

npm run ios

Like npm start, but also attempts to open your app in the iOS Simulator if you're on a Mac and have it installed.

npm run android

Like npm start, but also attempts to open your app on a connected Android device or emulator. Requires an installation of Android build tools (see React Native docs for detailed setup). We also recommend installing Genymotion as your Android emulator. Once you've finished setting up the native build environment, there are two options for making the right copy of adb available to Create React Native App:

Using Android Studio's adb
  1. Make sure that you can run adb from your terminal.
  2. Open Genymotion and navigate to Settings -> ADB. Select “Use custom Android SDK tools” and update with your Android SDK directory.
Using Genymotion's adb
  1. Find Genymotion’s copy of adb. On macOS for example, this is normally /Applications/Genymotion.app/Contents/MacOS/tools/.
  2. Add the Genymotion tools directory to your path (instructions for Mac, Linux, and Windows).
  3. Make sure that you can run adb from your terminal.

npm run eject

This will start the process of "ejecting" from Create React Native App's build scripts. You'll be asked a couple of questions about how you'd like to build your project.

Warning: Running eject is a permanent action (aside from whatever version control system you use). An ejected app will require you to have an Xcode and/or Android Studio environment set up.

Customizing App Display Name and Icon

You can edit app.json to include configuration keys under the expo key.

To change your app's display name, set the expo.name key in app.json to an appropriate string.

To set an app icon, set the expo.icon key in app.json to be either a local path or a URL. It's recommended that you use a 512x512 png file with transparency.

Writing and Running Tests

This project is set up to use jest for tests. You can configure whatever testing strategy you like, but jest works out of the box. Create test files in directories called __tests__ or with the .test extension to have the files loaded by jest. See the the template project for an example test. The jest documentation is also a wonderful resource, as is the React Native testing tutorial.

Environment Variables

You can configure some of Create React Native App's behavior using environment variables.

Configuring Packager IP Address

When starting your project, you'll see something like this for your project URL:

exp://192.168.0.2:19000

The "manifest" at that URL tells the Expo app how to retrieve and load your app's JavaScript bundle, so even if you load it in the app via a URL like exp://localhost:19000, the Expo client app will still try to retrieve your app at the IP address that the start script provides.

In some cases, this is less than ideal. This might be the case if you need to run your project inside of a virtual machine and you have to access the packager via a different IP address than the one which prints by default. In order to override the IP address or hostname that is detected by Create React Native App, you can specify your own hostname via the REACT_NATIVE_PACKAGER_HOSTNAME environment variable:

Mac and Linux:

REACT_NATIVE_PACKAGER_HOSTNAME='my-custom-ip-address-or-hostname' npm start

Windows:

set REACT_NATIVE_PACKAGER_HOSTNAME='my-custom-ip-address-or-hostname'
npm start

The above example would cause the development server to listen on exp://my-custom-ip-address-or-hostname:19000.

Ejecting from Create React Native App

If you want to build and deploy your app yourself, you'll need to eject from CRNA and use Xcode and Android Studio.

This is usually as simple as running npm run eject in your project, which will walk you through the process. Make sure to install react-native-cli and follow the native code getting started guide for React Native.

Troubleshooting

Networking

If you're unable to load your app on your phone due to a network timeout or a refused connection, a good first step is to verify that your phone and computer are on the same network and that they can reach each other. Create React Native App needs access to ports 19000 and 19001 so ensure that your network and firewall settings allow access from your device to your computer on both of these ports.

Try opening a web browser on your phone and opening the URL that the packager script prints, replacing exp:// with http://. So, for example, if underneath the QR code in your terminal you see:

exp://192.168.0.1:19000

Try opening Safari or Chrome on your phone and loading

http://192.168.0.1:19000

and

http://192.168.0.1:19001

If this works, but you're still unable to load your app by scanning the QR code, please open an issue on the Create React Native App repository with details about these steps and any other error messages you may have received.

If you're not able to load the http URL in your phone's web browser, try using the tethering/mobile hotspot feature on your phone (beware of data usage, though), connecting your computer to that WiFi network, and restarting the packager.

iOS Simulator won't open

If you're on a Mac, there are a few errors that users sometimes see when attempting to npm run ios:

  • "non-zero exit code: 107"
  • "You may need to install Xcode" but it is already installed
  • and others

There are a few steps you may want to take to troubleshoot these kinds of errors:

  1. Make sure Xcode is installed and open it to accept the license agreement if it prompts you. You can install it from the Mac App Store.
  2. Open Xcode's Preferences, the Locations tab, and make sure that the Command Line Tools menu option is set to something. Sometimes when the CLI tools are first installed by Homebrew this option is left blank, which can prevent Apple utilities from finding the simulator. Make sure to re-run npm/yarn run ios after doing so.
  3. If that doesn't work, open the Simulator, and under the app menu select Reset Contents and Settings.... After that has finished, quit the Simulator, and re-run npm/yarn run ios.

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Application for scanning and automatically translating mail

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