Hey there, I’ve run into this exact issue before when setting up Unity Remote for Android testing—let’s walk through the most common fixes to get your device recognized:

Step 1: Enable USB Debugging on Your Phone #

This is the #1 culprit for adb not seeing your device:

• Open your phone’s Settings → go to About Phone → tap Build Number 7 times to unlock Developer Options.
• Go back to Settings, find Developer Options, and toggle on USB Debugging.
• On some devices (like Samsung, Xiaomi), you’ll also need to enable USB Debugging (Security Settings) or Install via USB to let adb communicate with your phone.

Step 2: Set the Correct USB Connection Mode #

When you plug your phone into your PC, pull down the notification shade and make sure the connection mode is set to File Transfer (MTP)—charging-only mode won’t let adb detect your device.

Step 3: Verify adb Can See Your Device #

Let’s check if adb itself is working properly:

1. Open Command Prompt (CMD) on your PC.
2. Navigate to your adb directory with this command:

   cd C:\Users\PNP-AIDG\AppData\Local\Android\sdk\platform-tools
   

3. Run:

   adb devices
   

   • If your device shows up in the list, great—move to the next step.
   • If not, you need to install your phone’s official USB driver:
     • Head to your phone manufacturer’s website and download the USB driver for your specific model.
     • Install the driver, then unplug and re-plug your phone.

Step 4: Restart the adb Server #

Sometimes adb gets stuck in a broken state—restart it with these commands:

adb kill-server
adb start-server

Run adb devices again to see if your device is now recognized.

Step 5: Configure Unity Remote 5 Correctly #

• On your phone, open Unity Remote 5 and make sure it’s connected to the same Wi-Fi network as your PC (if using wireless) or that the USB connection is active.
• In Unity Editor, go to Edit → Project Settings → Editor.
• Under the Unity Remote section, set Device to your phone’s model (if it appears in the dropdown) or select Any Android Device.

Step 6: Double-Check Unity’s SDK Path #

• Open Unity Hub, go to your installed Unity version, click the three dots → Add Modules to confirm Android Build Support, SDK, and JDK are properly installed.
• In Unity Editor, go to Edit → Preferences → External Tools and verify that the Android SDK path points to C:\Users\PNP-AIDG\AppData\Local\Android\sdk—if not, update it to the correct location.

Final Troubleshoot Tip #

If none of the above works, try restarting both your PC and phone. Sometimes a simple reboot clears up connection glitches that adb can’t handle.

内容的提问来源于stack exchange，提问作者Neowb