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Rafael Monroy Rodriguez
Asked: 2021-11-26 09:25:09 +0800 CST 2021-11-26 09:25:09 +0800 CST

Error running react native project

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Hello, I just installed react nativeand I had no problem until the step of putting the following comando:

npx react-native run android

When putting the command I get the following error

enter image description here

Any solution? Thanks.

react-native

2 Answers

  1. Best Answer

    I use expo.io to run the apps. The browser opens with a barcode that you can then read with the Expo app on Android and the app runs on your Android phone. Because if not, you have to have Android Studio installed and it takes up a lot and is tedious to configure. Expo.io is easy and above all, when it comes to generating the file to upload to Google Play console. The same would happen with iOS, you should have a Mac to run the app and with Expo.io it is not necessary.

    The steps:

    Facility

    npm install --global expo-cli

    Create app

    expo init calculator42

    Start the emulator

    cd calculator42
expo start

    Build the app to download the .aab file

    expo build:android -t app-bundle

    Then you go to the web, download the .AAB file and you can now upload it to Google Play Console.

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  2. The mistake is that you have not configured the development environment correctly, it is true that with Expo it is much easier to start, however if you are going to develop an app in a more professional way, it is recommended to do it through the react-native CLI.

    You have to follow the documentation to the letter. Basically the most important of the documentation are the following things to keep in mind:

    1. NodeJS
    2. Open JDK (Java Development Kit)
    3. AndroidStudio
    4. ANDROID_HOME and JAVA_HOME environment variables
    5. Add platform-tools to the PATH

    After making sure you have this properly installed and an ADV (Android Virtual Device) you shouldn't have any problems. There are many items that require React Native to be installed, but believe me, once you have the environment set up, it is very simple.

    I repeat, if it is to start and see if you like the language, I recommend that you start with Expo, on the other hand, if you want to develop something not so simple, I recommend the RN CLI.

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