Upgrading your application's targetSdk to 35 (Android 15) introduces a significant visual breaking change. Upon compilation, you may notice your TopAppBar colliding with the system clock, or your bottom navigation buttons obscured by the device's gesture handle. This is not a rendering bug; it is the new standard. Android 15 enforces an "Edge-to-Edge" layout by default for all apps targeting API 35. The operating system deprecated the ability to opt-out of this behavior, meaning window.setDecorFitsSystemWindows(true) is effectively ignored. This guide provides a rigorous technical breakdown of why this shift occurred and details production-ready solutions for both Jetpack Compose and legacy XML View systems. The Root Cause: Why Layouts Break on API 35 Historically, the Android Window class managed a concept called "fitting system windows." When enabled (the previous default), the framework calculated the height of the status bar...
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