Windows Subsystem for Android™️
Windows Subsystem for Android™️ enables your Windows 11 device to run Android applications that are available in the Amazon Appstore. Android is a trademark of Google LLC. If you're a developer interested in targeting Windows desktop devices and optimizing for the Windows operating system, this guide is for you.
To make your Android app available on Windows 11 devices, you must:
For more information or support:
- Sign up for updates to the Amazon Appstore on Windows program.
- Visit the Amazon developer support portal where you can find articles, forums, FAQs, or reach out for direct support via the Appstore "Contact us" page once you set up an Amazon Developer account.
This guide can help you test and debug your Android app on Windows:
- Set up your development environment, including prerequisites, installing the Amazon Appstore, and using the Settings app.
- Handle input compatibility considerations for Windows devices, such as: keyboard input, mouse input, and window management and resizing.
- Test and debug your app on a Windows 11 device.
- Troubleshoot and find answers.
Want to learn more about Windows Subsystem for Android roadmap, discuss developer issues and file bugs or feature requests with the subsystem team? Visit the Windows Subsystem for Android Developers GitHub.
The Windows Subsystem for Android™️ Preview Program allows users to receive early-preview builds of the Windows Subsystem for Android™ and Amazon Appstore on Windows. For more details, visit the Preview Program page.
Set up your development environment
To test your Android app in the Windows desktop environment, a bit of set up will be required.
Windows Subsystem for Android is available on Windows 11. Your device must meet specific requirements: Device requirements.
Install the Amazon Appstore
The Microsoft Store will automatically install Windows Subsystem for Android silently in the background when either of the two following user actions are taken:
- Install the Amazon Appstore from the Microsoft Store. Selecting Get will begin the installation of the app.
- Install an Android app from the Microsoft Store for the first time, which will also install the Amazon Appstore.
The Amazon Appstore and the Windows Subsystem for Android Settings app will then appear in the Windows 11 Start menu and be available on search, offering a catalogue of Android apps.
The Amazon Appstore on Windows (a requirement for running Android apps on Windows 11) is available in select regions.
Windows Subsystem for Android™️ Settings app
To access the Windows Subsystem for Android Settings app, go to: Start > All Apps > Windows Subsystem for Android™️ Settings. Learn more about specific settings app features: Manage settings for mobile apps on Windows.
Input compatibility considerations for Windows devices
There are a few unique input behaviors to consider that will likely require updates to your Android app code, designed for handheld devices, to be compatible when running on a Windows desktop device via the Amazon Appstore.
For text input fields handled by an on-screen virtual keyboard input method (or IME), such as
EditText, apps should behave as expected. (EditText class in the Android docs).
For keystrokes that cannot be anticipated by the framework, apps will need to handle the behavior themselves. If this is already implemented in-app, no extra work is required.
As an example, some games may already support movement facilitated via keyboard, through
d keys, alongside touch input.
The following are keyboard inputs that developers should consider code updates for when building for Windows 11 devices:
- Enter Key
- Arrow-key and Tab-key Navigation
- Change Selected Item Highlight Color
- Ctrl-based Shortcuts
Learn more about how to optimize for these keyboard input scenarios on desktop devices by following the Android documentation:
- Input compatibility guide in the Android docs
- Handle keyboard input guide in the Android docs
- Use touch gestures guide in the Android docs
Developers should consider updating code for the following mouse inputs when building for Windows devices:
- Right Click
- Tooltips / Hover Text
- Hover Effects
- Mouse Scroll Wheel Action
- Drag and Drop
Mouse input, similar to keyboard input, must follow the official Android app guidelines. This means using the
InputDevice class paired with the
SOURCE_MOUSE constant. Learn more about how to optimize for these mouse input scenarios on desktop devices by following the Android documentation:
- Input compatibility guide in the Android docs
- InputDevice reference in the Android docs
- SOURCE_MOUSE reference in the Android docs
Window management and resizing
Unlike traditional mobile form factors, Android apps running on Windows 11 can be freely resized, should be responsive in their resizing, and can be snapped using Windows actions/gestures.
Minimum screen requirement
Windows 11 enforces a minimum screen requirement of 720p resolution (1280x720) with a >9” screen.
Letter & pillar boxing
When the aspect ratio of a window size does not align between the device screen sizes that window is being displayed on, the result may be Letterboxing (the window is wider than it is high, or horizontally longer) or Pillarboxing (the window is more narrow than it is wide, or vertically longer). The result is bars being placed on the sides of the window in order to center it. These bars may be light- or dark-themed depending on the system settings selected. This will only occur as necessary when the Android app is snapped or maximized, allowing Android apps to take advantage of the rich snapping features in Windows and integrate into the windowing model.
Additional resizing considerations
The following should also be considered when updating an Android app to run on a Windows 11 device with respect to window management and resizing:
- Initial launch size
- Window dimensions
- Content bounds
- Free form resizing
- Screen Orientation
Learn more about how to optimize for window resizing scenarios on desktop devices by following the Window Management guide in the Android docs.
Test and debug
To test and debug your app on a Windows 11 device using the Windows Subsystem for Android the following set up steps are required.
Enable developer mode in Windows Settings
You must first enable developer mode in Windows Settings. There are three ways to enable developer mode:
- Open the Windows Subsystem for Android Settings app. Once open, enable Developer Mode.
- Search for “Developer Settings” in Windows search.
- Navigate to Settings > Privacy and Security > For developers > Developer mode.
Connect to the Windows Subsystem for Android for debugging
To connect to the Windows Subsystem for Android VM for debugging:
Launch an Android app that was installed using the Amazon Appstore.
You can connect using adb connect with the following command (you must have adb installed):
adb connect 127.0.0.1:58526
Connect to a test device
To connect to a test device (with Windows Subsystem for Android installed) on the same network from Windows/Mac:
On the test device (where Windows Subsystem for Android is installed) open a PowerShell window and identify the IP address of the test device by running the command:
Using the debugging device terminal where Android Studio and the Android SDK is installed (Mac/Windows), enter the command:
adb connect <TEST DEVICE IP ADDRESS>:58526
<TEST DEVICE IP ADDRESS> can be found in the output of "ipconfig" from the test device. You can also deploy and debug apps from Android Studio.
To use Android Debug Bridge (ADB) to connect your development workstation directly to your Android device so you can install packages and evaluate changes, see Android Debug Bridge in the Android Open Source Project docs.
Debug your app
While apps should be installed using the Amazon Appstore, debugging an Android app on a Windows device is possible using an APK (Android application package) and adb (Android Debug Bridge).
To debug an APK using adb:
Follow the steps to connect to the Windows Subsystem for Android VM above.
Install the APK using the adb install command:
adb install app-debug.apk
Performing Streamed Install Success
A successful “app installed” notification will appear in the Windows notification menu and the app will launch once selected.
Building Universal APKs
Windows Subsystem for Android utilizes Intel Bridge Technology to emulate Arm applications on x86 based processors. Arm applications will run on Arm based processors natively. The emulation layer will induce a performance overhead – for optimal performance, submit your application for both the x86-64 and Arm64 architectures.
VM lifecycle considerations
Windows Subsystem for Android utilizes a virtual machine (VM) which provides compatibility with the AOSP framework and devices like keyboards, mice, touch, pen, etc.
There are three possible states for the VM running apps with Windows Subsystem for Android:
- Lightweight Doze: Activated after no app activity for 3 minutes. Deactivated by user activity or an app notification.
- Not Running: Activated after no app activity for 7 minutes.
Transitions between these states are triggered by user activity, such as launching or interaction with the Android app or an app notification. Android apps are paused and then stopped when their window is minimized.
The properties for the Windows Subsystem for Android VM are listed below. Hardcoding these values is not recommended as that could cause future incompatibilities.
|Build.MODEL||Subsystem for Android(TM)|
Windows Subsystem for Android performs per-file encryption that is software-based.
Both Windows kernel-mode drivers and Windows applications running at medium integrity level (IL) can inspect arbitrary Android containers and Android app memory. There are no plans to add detection for cheats/macro/bot/suspicious behaviors detection in the short-term.
getSecurityLevel will get
SECURITY_LEVEL_SW_SECURE_CRYPTO. Learn more about
getSecurityLevel in the Android API Reference guide.
Uninstalling Windows Subsystem for Android
You can uninstall the Windows Subsystem for Android, but note that all associated apps will also be uninstalled.
- Uninstalling the Amazon Appstore will uninstall the Windows Subsystem for Android and all other Android apps.
- Uninstalling an Amazon Appstore app will only uninstall the app (same behavior as Windows apps).
- Uninstalling the Windows Subsystem for Android will uninstall the Amazon Appstore and all Android apps.
If you encounter issues specific to the Amazon Appstore on Windows, try the following troubleshooting steps:
- Select Windows search from the Windows task bar.
- Search for “Amazon Appstore” and right-click on the Amazon Appstore icon.
- Select “App Settings” in the dropdown options.
- Select “Storage and Cache” and click both “Clear Storage” and “Clear cache”.
- Go back and select “Force Stop”.
- Close the Amazon Appstore Settings window.
- Relaunch the Amazon Appstore.
For further troubleshooting steps relating to the Windows Subsystem for Android Settings app or to leave feedback using Feedback Hub, see Troubleshooting and FAQ for mobile apps on Windows.
For any other developer questions and support, use the Windows Subsystem for Android tag on Microsoft Q&A.
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