4 Ways to Run React Native Expo Apps When No Android Device Is Found

If you get the error “No Android connected device found” when running a React Native Expo app, don’t worry. This guide walks you through 4 practical options to run your app, including using a physical device, an emulator, environment variable fixes, and Expo tunnel mode.

Option 1: Use a Physical Android Device

1. Install Expo Go on your Android phone (Google Play Store).

2. Connect your phone to the same Wi-Fi network as your computer.

3. Run the Expo dev server:

`npx expo start`

Scan the QR code in Expo Dev Tools using Expo Go → the app runs instantly.

Option 2: Use an Android Emulator

1. Install Android Studio from developer.android.com/studio.

2. Open the AVD Manager → create a virtual device (e.g., Pixel 5).

3. Start the emulator before running Expo.

4. Run Expo:

`npx expo start`

Press a in the terminal → Expo should detect the emulator and launch the app.

Option 3: Check Environment Variables (Windows)

If you are using emulators and still see errors:

• Set ANDROID_HOME to your SDK path, e.g.:

C:\Users\YourUser\AppData\Local\Android\Sdk

• Add these to your PATH environment variable:

C:\Users\YourUser\AppData\Local\Android\Sdk\platform-tools

C:\Users\YourUser\AppData\Local\Android\Sdk\emulator

Restart VS Code or your terminal and try again.

Option 4: Use Expo Tunnel Mode

If LAN connection fails or devices are on different networks, use:

`npx expo start --tunnel`

The QR code works on your physical device even without emulators or direct LAN connection.

💡 Tip: For beginners, using Expo Go on a phone is the fastest way to start. Emulators can be added later if needed for testing.