![]() Return WindowManagerGlobal.ADD_BAD_APP_TOKEN This ensures secure interaction between the application and the window manager (by making it impossible to add windows on top of other applications), and also makes it easy for the activity manager to make direct requests to the window manager.Īnd the code that throws “BadTokenException” : The activity manager gives this token to both the (*application) and the window manager, and it sends the token to the window manager each time it wants to add a new window to the screen. ![]() When an application starts up for the first time, the ActivityManagerService creates a special kind of window token called an application window token, which uniquely identifies the application’s top-level container window. Without window tokens, this necessary identification step wouldn’t be possible and the window manager wouldn’t be able to protect itself from malicious applications. If the tokens don’t match, the window manager rejects the request and throws a BadTokenException. The window manager protects against this by requiring applications to pass their application’s window token as part of each request to add or remove a window. Window tokens are important for security reasons because they make it impossible for malicious applications to draw on top of the windows of other applications. Window Tokens:Īs the name suggest, a window token is a special type of Binder token used by window manager to uniquely identify a window in the system. Jetpack WindowManager also offers all the necessary APIs to optimize layouts for foldable devices.WindowManagerService (WMS) is a system service that manages the windows on Android. To learn more, refer to our “Support different screen sizes” developer guide. Val metrics = WindowMetricsCalculator.getOrCreate() For View-based apps, you can utilize the following code snippet to calculate window size classes: In Jetpack Compose, you can use window size classes by importing them from the 3 library, which internally leverages WindowMetricsCalculator. These breakpoints strike a balance between layout simplicity and the flexibility to optimize your app for unique cases. Building upon this, window size classes are a collection of opinionated viewport breakpoints that assist in designing, developing, and testing responsive and adaptive application layouts. The Jetpack WindowManager’s WindowMetricsCalculator interface provides the most accurate measurement of the available screen space for your app. However, with the introduction of different form factors like foldables and display modes like multi-window and multi-display, understanding the size of the app window has become essential. Traditionally, developers relied on the size of the device display to determine app layout. Let’s recap the various use cases covered by the Jetpack WindowManager library. Jetpack WindowManager is a crucial library for optimizing your Android app for different form factors, and this release represents a significant milestone with a host of new features and improvements. ![]() Numerous new devices have entered the market, and many new use cases have been discovered. It has been over a year since the stable release of Jetpack WindowManager 1.0, and many exciting developments have unfolded in the realm of foldable and large screen devices. Posted by Francesco Romano, Developer Relations Engineer on Android
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