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Prerequisites

  • nvm use
  • npm install -g watchman
  • npm install -g yarn
  • Run npx react-native doctor to see other requirements
  • First time starting meditrak-app-new? You must delete the old version of the app from the device.

This is a new React Native project, bootstrapped using @react-native-community/cli.

Getting Started

Note

Make sure you have completed the React native environment setup instructions till “Creating a new application” step, before proceeding.

Step 1: Start the Metro Server

First, you will need to start Metro, the JavaScript bundler that ships with React Native.

To start Metro, run the following command from the root of your React Native project:

# using npm
npm start

# OR using Yarn
yarn start

Step 2: Start your Application

Let Metro bundler run in its own terminal. Open a new terminal from the root of your React Native project. Run the following command to start your Android or iOS app:

For Android

# using npm
npm run android

# OR using Yarn
yarn android

For iOS

# using npm
npm run ios

# OR using Yarn
yarn ios

If everything is set up correctly, you should see your new app running in your Android Emulator or iOS Simulator shortly, provided you have set up your emulator/simulator correctly.

This is one way to run your app; you can also run it directly from within Android Studio and Xcode respectively.

Step 3: Modifying your App

Now that you have successfully run the app, let’s modify it.

  1. Open App.tsx in your text editor of choice and edit some lines.
  2. Android. Press the R key twice or “Reload” from the “Developer Menu” (Ctrl + M (on Windows and Linux) or ⌘M (on macOS)) to see your changes!
    iOS. Hit ⌘R in your iOS Simulator to reload the app and see your changes!

Congratulations! 🎉

You’ve successfully run and modified your React Native App. 🥳

Now what?

  • If you want to add this new React Native code to an existing application, check out Integration with Existing Apps.
  • If you’re curious to learn more about React Native, check out the Introduction to React Native.

Troubleshooting

If you can’t get this to work, see Troubleshooting.

Learn more

To learn more about React Native, take a look at the following resources: