getting-started.md

id	getting-started
title	Getting started
sidebar_label	Getting started

What follows within the Fundamentals section of this documentation is a tour of the most important aspects of React Navigation. It should cover enough for you to know how to build your typical small mobile application, and give you the background that you need to dive deeper into the more advanced parts of React Navigation.

Pre-requisites

If you're already familiar with JavaScript, React and React Native, then you'll be able to get moving with React Navigation quickly! If not, we highly recommend you to gain some basic knowledge first, then come back here when you're done.

Here are some resources to help you out:

1. React Native Express (Sections 1 to 4)
2. Main Concepts of React
3. React Hooks
4. React Context (Advanced)

Minimum requirements

• react-native >= 0.63.0
• expo >= 41 (if you use Expo)
• typescript >= 4.1.0 (if you use TypeScript)

Installation

Install the required packages in your React Native project:

npm install @react-navigation/native

React Navigation is made up of some core utilities and those are then used by navigators to create the navigation structure in your app. Don't worry too much about this for now, it'll become clear soon enough! To frontload the installation work, let's also install and configure dependencies used by most navigators, then we can move forward with starting to write some code.

The libraries we will install now are react-native-screens and react-native-safe-area-context. If you already have these libraries installed and at the latest version, you are done here! Otherwise, read on.

Installing dependencies into an Expo managed project

In your project directory, run:

expo install react-native-screens react-native-safe-area-context

This will install versions of these libraries that are compatible.

You can now continue to "Hello React Navigation" to start writing some code.

Installing dependencies into a bare React Native project

In your project directory, run:

npm install react-native-screens react-native-safe-area-context

Note: You might get warnings related to peer dependencies after installation. They are usually caused by incorrect version ranges specified in some packages. You can safely ignore most warnings as long as your app builds.

From React Native 0.60 and higher, linking is automatic. So you don't need to run react-native link.

If you're on a Mac and developing for iOS, you need to install the pods (via Cocoapods) to complete the linking.

npx pod-install ios

react-native-screens package requires one additional configuration step to properly work on Android devices. Edit MainActivity.java file which is located in android/app/src/main/java/<your package name>/MainActivity.java.

Add the following code to the body of MainActivity class:

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(null);
}

and make sure to add an import statement at the top of this file:

import android.os.Bundle;

This change is required to avoid crashes related to View state being not persisted consistently across Activity restarts.

Now, we need to wrap the whole app in NavigationContainer. Usually you'd do this in your entry file, such as index.js or App.js:

import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';

export default function App() {
  return (
    <NavigationContainer>{/* Rest of your app code */}</NavigationContainer>
  );
}

Note: When you use a navigator (such as stack navigator), you'll need to follow the installation instructions of that navigator for any additional dependencies. If you're getting an error "Unable to resolve module", you need to install that module in your project.

Now you are ready to build and run your app on the device/simulator.

Continue to "Hello React Navigation" to start writing some code.