Скачать или смотреть How to Fix the No Emulators Found Error When Running React Native on Android in macOS

Learn how to troubleshoot the `react-native run-android` error on macOS. Step-by-step guide to setting up emulators and correcting common issues for a smooth development experience.
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How to Fix the No Emulators Found Error When Running React Native on Android in macOS

If you’re a React Native developer working on macOS, you may encounter an issue where the command react-native run-android fails with an error message indicating that no emulators are found. This problem can be frustrating, especially when everything works perfectly with react-native run-ios. Let’s break down how to tackle this issue step-by-step.

Understanding the Problem

When you attempt to run your React Native app for Android, you might see an error like this:

[[See Video to Reveal this Text or Code Snippet]]

This indicates that the system cannot find any Android Virtual Devices (AVDs) configured in your Android emulator environment. Additionally, following the emulator error, you often encounter another error related to app installation due to environmental setup issues like missing tools or outdated configurations.

Solution Steps

1. Update Android Studio

The first step in resolving this issue is to ensure that your Android development environment is up-to-date:

Open Android Studio: Launch Android Studio on your computer.

Update SDK Tools: Navigate to the SDK Manager (found under “Preferences” or “Settings”) and update all necessary tools for the emulator, including the Android Emulator, SDK Platform, and other relevant updates.

2. Configure Your Project’s Gradle

Next, you’ll want to ensure that your project is using the latest version of Gradle:

Locate the Android Folder: Inside your React Native project, go to the android folder.

Edit Gradle Wrapper: Open android/app/gradle/gradle-wrapper.properties and look for the line starting with distributionUrl. Update it to the latest version of Gradle. This usually looks something like this:

[[See Video to Reveal this Text or Code Snippet]]

Replace x.x with the most recent version available.

3. Clear Cache

After updating your tools and configurations, it's helpful to clear any cached data that might interfere with your project:

Reset Cache: Run the following command in your terminal:

[[See Video to Reveal this Text or Code Snippet]]

This command clears React Native's cache and ensures that all previous remnants are removed.

4. Launch the Emulator and Run the App

Now it's time for the final step:

Open Android Emulator: Start your Android emulator either through Android Studio or from the terminal.

Run the Application: Go back to your terminal, navigate to your React Native project directory, and run:

[[See Video to Reveal this Text or Code Snippet]]

If all steps are followed correctly, your app should now compile and launch on the emulator without any issues.

Conclusion

Encountering issues with Android emulators when working in React Native can be a hassle, especially for macOS users. Following the steps outlined above will help you configure your environment correctly and resolve common errors. Always keep your tools updated, and check your configurations to ensure a seamless development experience.

With that, you can return to building your React Native applications with confidence!