This article will help you install and build your first React Native app with React Native CLI in your mac.

Verify Homebrew installation using brew -v, and if Homebrew is not installed then install Homebrew using

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

Note: Homebrew installation requires the xcode-select command-line tool to work so it's recommended to install Xcode as well or it will ask to confirm the installation of xcode-select tool.

Install node and watchman

brew install node watchman

Install JDK using break cask to install GUI software installation setups

brew cask install adoptopenjdk/openjdk/adoptopenjdk8

Install Android Studio

Download and install Android Studio. While on Android Studio intallation wizard, make sure the boxes next to all of the following items are checked:

• Android SDK

• Android SDK Platform

• Android Virtual Device

Once setup has finalized and you’re presented with the Welcome screen, proceed to the next step.

Add the required android SDK dependencies’ paths in environment variables for React Native:

can use any editor instead of open open ~/.bash_profile

Paste the following text at the end of the file**
# after other pre-configured environment variables export
ANDROID_HOME=$HOME/Library/Android/sdk export

PATH=$PATH:$ANDROID_HOME/emulator export
PATH=$PATH:$ANDROID_HOME/tools export
PATH=$PATH:$ANDROID_HOME/tools/bin export
PATH=$PATH:$ANDROID_HOME/platform-tools

MacOS Cataline has a default shell as zsh so to fix the warning below, edit/create ~/.zprofile (under /users/username/) file for Cataline and execute the commands below in your terminal.

chsh -s /bin/zsh
source ~/.zprofile

You can find Android SDK Location in Android SDK tab preferences in Android Studio to put in ANDROID_HOME

Helpful Commands

printenv prints all environment variables.

xcode-select --version allows you to view the version of xcode-select CLI.

Create and Run a React Native Project

The steps to run the project is the same on all operating systems:

Create a React Native project:

npx react-native init AwesomeApp

Follow the steps to create an android virtual device (AVD)

Run the projects:

cd AwesomeApp
npx react-native run-android --verbose

The above command process may ask to install CocoaPods, which is a dependency manager for iOS projects and required to run iOS apps.

In the above command, -verbose is optional but useful to view any potential issues, like below.

Known Gradle Issues

InvokerHelper Error: Gradle version 6.1.1 can cause this issue, so make sure to update distributionUrl attribute in AwesomeApp\android\gradle\wrapper\gradle-wrapper.properties file:

# To fix the "Could not initialize class org.codehaus.groovy.runtime.InvokerHelper" error, use latest gradle
distributionUrl=https\\://services.gradle.org/distributions/gradle-6.5.1-all.zip

and update classpath in AwesomeApp\android\build.gradle:

classpath("com.android.tools.build:gradle:4.0.0")

Note: React Native may not use the exact

buildToolsVersion

version declared in the

AwesomeApp/android/build.gradle

file, so in case of error the specific version needs to be installed from the Android SDK.

build.gradle file with version

To fix Could not initialize class org.codehaus.groovy.reflection.ReflectionCache

Update gradle-wrapper.properties

In my case distributionUrl distributionUrl=https\://services.gradle.org/distributions/gradle-6.2-all.zip

And I changed it to

distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip

Once you have updated all the files and followed the commented steps, you can start your application.

npx react-native run-android --verbose

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