This project was bootstrapped with Create React Native App.
Below you’ll find information about performing common tasks. The most recent version of this guide is available here.
You should only need to update the global installation of
create-react-native-app very rarely, ideally never.
react-native-scripts dependency of your app should be as simple as bumping the version number in
package.json and reinstalling your project’s dependencies.
Upgrading to a new version of React Native requires updating the
expo package versions, and setting the correct
app.json. See the versioning guide for up-to-date information about package version compatibility.
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.
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
Runs the jest test runner on your tests.
npm start, but also attempts to open your app in the iOS Simulator if you’re on a Mac and have it installed.
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:
Settings -> ADB. Select “Use custom Android SDK tools” and update with your Android SDK directory.
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.
You can edit
app.json to include configuration keys under the
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.
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.
You can configure some of Create React Native App’s behavior using environment variables.
When starting your project, you’ll see something like this for your project URL:
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
set REACT_NATIVE_PACKAGER_HOSTNAME='my-custom-ip-address-or-hostname' npm start
The above example would cause the development server to listen on
Create React Native App does a lot of work to make app setup and development simple and straightforward, but it’s very difficult to do the same for deploying to Apple’s App Store or Google’s Play Store without relying on a hosted service.
Expo provides free hosting for the JS-only apps created by CRNA, allowing you to share your app through the Expo client app. This requires registration for an Expo account.
exp command-line tool, and run the publish command:
$ npm i -g exp $ exp publish
You can also use a service like Expo’s standalone builds if you want to get an IPA/APK for distribution without having to build the native code yourself.
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.
If you have made use of Expo APIs while working on your project, then those API calls will stop working if you eject to a regular React Native project. If you want to continue using those APIs, you can eject to “React Native + ExpoKit” which will still allow you to build your own native code and continue using the Expo APIs. See the ejecting guide for more details about this option.
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
http://. So, for example, if underneath the QR code in your terminal you see:
Try opening Safari or Chrome on your phone and loading
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. If you are using a VPN you may need to disable it.
If you’re on a Mac, there are a few errors that users sometimes see when attempting to
npm run ios:
There are a few steps you may want to take to troubleshoot these kinds of errors:
Command Line Toolsmenu 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 iosafter doing so.
Reset Contents and Settings.... After that has finished, quit the Simulator, and re-run
npm/yarn run ios.
If you’re not able to scan the QR code, make sure your phone’s camera is focusing correctly, and also make sure that the contrast on the two colors in your terminal is high enough. For example, WebStorm’s default themes may not have enough contrast for terminal QR codes to be scannable with the system barcode scanners that the Expo app uses.
If this causes problems for you, you may want to try changing your terminal’s color theme to have more contrast, or running Create React Native App from a different terminal. You can also manually enter the URL printed by the packager script in the Expo app’s search bar to load it manually.
Source Code: https://github.com/SuperCheese21/quaketrack
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If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?
In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.
Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.
Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.
The popularity of React Native comes from its advantages. Some of its advantages are as follows:
Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.
React Native is very close to native. Consider the following aspects as described on the React Native website:
Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.
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With more of us using smartphones, the popularity of mobile applications has exploded. In the digital era, the number of people looking for products and services online is growing rapidly. Smartphone owners look for mobile applications that give them quick access to companies’ products and services. As a result, mobile apps provide customers with a lot of benefits in just one device.
Likewise, companies use mobile apps to increase customer loyalty and improve their services. Mobile Developers are in high demand as companies use apps not only to create brand awareness but also to gather information. For that reason, mobile apps are used as tools to collect valuable data from customers to help companies improve their offer.
There are many types of mobile applications, each with its own advantages. For example, native apps perform better, while web apps don’t need to be customized for the platform or operating system (OS). Likewise, hybrid apps provide users with comfortable user experience. However, you may be wondering how long it takes to develop an app.
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_Average time spent: two to five weeks _
This is the initial stage and a crucial step in setting the project in the right direction. In this stage, you brainstorm ideas and select the best one. Apart from that, you’ll need to do some research to see if your idea is viable. Remember that coming up with an idea is easy; the hard part is to make it a reality.
All your ideas may seem viable, but you still have to run some tests to keep it as real as possible. For that reason, when Web Developers are building a web app, they analyze the available ideas to see which one is the best match for the targeted audience.
Targeting the right audience is crucial when you are developing an app. It saves time when shaping the app in the right direction as you have a clear set of objectives. Likewise, analyzing how the app affects the market is essential. During the research process, App Developers must gather information about potential competitors and threats. This helps the app owners develop strategies to tackle difficulties that come up after the launch.
The research process can take several weeks, but it determines how successful your app can be. For that reason, you must take your time to know all the weaknesses and strengths of the competitors, possible app strategies, and targeted audience.
The outcomes of this stage are app prototypes and the minimum feasible product.
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