Microsoft shares more details about Android apps in Windows 11

Developers shouldn't expect saved state to be secure

Microsoft has shared more information about how Android apps will run under Windows 11

The company outlined its plans in a blog post detailing how the Windows Subsystem for Android, first outlined at the operating system's launch in June, would operate. The system, currently only available in preview, won't come installed by default. 

Users trigger the Windows Subsystem for Android installation by installing an Android app for the first time from the Microsoft store. This installs the Amazon app store automatically. Alternatively, they can install the Amazon app store manually from the Microsoft Store. 

Microsoft warned that developers might have to tweak their applications to handle Windows 11's input and display requirements. The company said that while apps using virtual keyboards should work as expected, developers might have to update them to handle unexpected keystrokes, such as navigation via the arrow and tab keys. Android developers should also consider updating their code to handle Windows 11 mouse input, such as right clicks and scroll wheels, it added. 

Window resizing might also be an issue, the company warned. Developers should consider the application window's initial launch size and screen orientation and decide whether they allow users to resize the application window freely. The alternative is to letterbox or pillarbox the app using vertical or horizontal bars as necessary. 

Microsoft also included a note on application security. Because Windows Subsystem for Android performs software-based per-file encryption, it offers limited protection. 

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"App developers should not expect their saved state to be secure," Microsoft warned. It also said that although Windows kernel drivers can inspect Android containers and Android application memory, it won't add plans to detect suspicious application behavior in the short term. 

The decision to install the Android subsystem separately rather than by default follows a move to decouple Windows Subsystem for Linux from the core operating system

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