Note: Make sure you have completed the React Native - Environment Setup instructions till "Creating a new application" step, before proceeding.
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:
make start
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:
make android
If everything is set up correctly, you should see your new app running in your Android Emulator shortly provided you have set up your emulator correctly.
make ios
If everything is set up correctly, you should see your new app running in your iOS Simulator shortly provided you have set up your simulator correctly.
Now that you have successfully run the app, let's modify it.
App.tsx
in your text editor of choice and edit some lines.For Android: Press the R key twice or select "Reload" from the Developer Menu (Ctrl + M (on Window and Linux) or Cmd ⌘ + M (on macOS)) to see your changes!
For iOS: Hit Cmd ⌘ + R in your iOS Simulator to reload the app and see your changes!
If you can't get this to work, see the Troubleshooting page.
To learn more about React Native, take a look at the following resources:
@facebook/react-native
- the Open Source; GitHub repository for React Native.