Скачать или смотреть Solving the ADB devices Empty Output Issue in Windows Docker Containers

Discover how to run `adb` commands successfully inside a Windows Docker container and connect to your Android devices via WiFi.
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Solving the ADB devices Empty Output Issue in Windows Docker Containers

When working on a Xamarin project, ensuring proper app installation on an Android device can be a significant hurdle—especially if you're relying on ADB (Android Debug Bridge) commands within a Windows Docker container. A common challenge that developers face is the output of adb devices, which can show as empty; this can stall your Continuous Integration (CI) setup. In this guide, we will outline a reliable solution to tackle this problem and successfully connect your Docker container to your Android device.

Understanding the Problem

The output from running the command adb devices in a Windows Docker container looks like this:

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

This indicates that the ADB server is running, but no devices are detected. Many users encounter this issue when they try to interface with Android devices through a Windows-based Docker container. Unlike Linux containers, where you can use flags like --privileged to resolve device access, the Windows platform presents unique challenges.

The Solution: Connecting ADB to Your Device via WiFi

Step 1: Ensure WiFi Connectivity

First, you'll need to make sure that your Docker Host machine is on the same WiFi network as your Android device. Here's how to verify connectivity:

Open a command prompt or PowerShell on your Docker Host machine.

Use the ping command to test the communication:

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

If you receive replies, your Docker Host can communicate with the Android device.

Step 2: Set Up ADB Over WiFi

Next, you'll initiate the ADB connection over WiFi instead of through USB. Follow these steps:

On your Docker Host machine (not within the container), open a terminal and run:

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

This command will switch the ADB mode to use TCP/IP on port 5555, which allows for wireless communication.

Next, inside your Docker container, you'll connect to the Android device using the IP address of your device:

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

Confirm that the device is connected by running:

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

You should now see your device listed.

Step 3: Trusting the Connection

Upon connecting, your Android device may prompt you to "trust" the Docker container as an untrusted machine. When this happens, your device will create an adbkey file, located in %userProfile%/.android on the Docker Host machine, which is used to authenticate future connections. To avoid being prompted for confirmation every time:

Copy the adbkey: You will need to transfer the adbkey from the host to the Docker container. Specifically, place it in the <container_userProfile_directory>/.android within the Docker container.

This step ensures that your device remembers the connection and trusts it going forward.

Conclusion

By following the steps outlined above, you should be able to overcome the challenge of an empty device list when using adb commands in a Windows Docker container. Setting up ADB over WiFi, while ensuring proper communication and trust between devices, allows developers to seamlessly integrate Android installations into their CI processes.

Armed with this solution, you can confidently move forward with your Xamarin project and enhance your development workflow!