Troubleshooting React Native adb reverse ENOENT on Android Emulator

Troubleshooting React Native adb reverse ENOENT on Android Emulator

22 April 2024 Stephan Petzl Leave a comment Tech-Help

Understanding the Issue

Developers working with React Native on Android emulators might encounter an error related to adb reverse when trying to test their applications. This error typically manifests as "Could not run adb reverse: spawnSync ~/Library/Android/sdk/platform-tools/adb ENOENT". This indicates that the system cannot find the Android SDK directory, even if it appears to be installed correctly.

Resolving the Environment Variable Issue

The root cause of this problem often lies in the environment variables, specifically ANDROID_HOME or ANDROID_SDK_ROOT. These environment variables help the system locate the SDK for operations such as running the Android emulator and executing adb (Android Debug Bridge) commands.

The solution is to set or update these environment variables. Here’s how you can do it on different operating systems:

  • macOS Mojave and earlier (or bash users):
    1. Open your bash profile: open .bash_profile
    2. Add the following lines:
      export ANDROID_SDK=/Users/<your_computer_name>/Library/Android/sdk
      export PATH=/Users/<your_computer_name>/Library/Android/sdk/platform-tools:$PATH
    3. Save and close the profile.
    4. Compile the changes: source ~/.bash_profile
  • macOS Catalina and zsh users:
    1. Open your .zshrc file: open ~/.zshrc
    2. If .zshrc file does not exist, create one: touch ~/.zshrc
    3. Add similar lines as mentioned above to your .zshrc file.
    4. Compile the changes: source ~/.zshrc
  • Windows:
    set ANDROID_HOME=c:/Users/whoever/AppData/Local/Android/Sdk

After updating the environment variables, ensure you restart your terminal (or command prompt) before attempting to run the emulator again.

Additional Troubleshooting Steps

If setting the environment variables does not resolve the issue, consider the following additional steps:

  • Verify that the path you’ve set for ANDROID_HOME or ANDROID_SDK_ROOT is correct and that the SDK is indeed installed there.
  • Ensure that you have the necessary permissions to access the SDK directory and its contents.
  • For Linux users, installing adb may be necessary. This can be done using the package manager, for example: sudo apt-get install android-tools-adb.

How Repeato Can Help

In the context of mobile app development and testing, issues with environment configuration can lead to significant delays. That’s where Repeato, a no-code test automation tool, can assist you. Repeato simplifies the testing process for your iOS and Android applications by eliminating the need for complex setup and environment variables.

With Repeato, you can create, run, and maintain automated tests quickly and efficiently, thanks to its use of computer vision and AI. It’s compatible with all sorts of app frameworks, such as React Native, Flutter, and Unity, and includes ADB on board, allowing for the execution of ADB commands via script steps. This can streamline your testing process and mitigate issues related to adb commands and environment variables.

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