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version: "1.0.1" name: aosp-framework-core description: | AOSP Part VI — Framework Core. Use when reasoning about system_server's boot sequence (the four boot phases, service registration, Watchdog), the Intent system (Intent matching, IntentFilter, IntentResolver, package visibility, intent verification), Activity & Window Management (ActivityTaskManagerService, WindowManagerService, activity lifecycle, task/stack model, splash screens), the window system (WindowState, SurfaceControl, input dispatching, focus, IME insets, transitions), the display system (DisplayManagerService, logical vs. physical displays, HDR, brightness, refresh-rate switching), or the View system (View hierarchy, measure/layout/draw, Canvas/RenderNode, hardware acceleration). Chapters 20–25. metadata: author: 'utzcoz' last-updated: '2026-06-16'
AOSP Part VI — Framework Core
The Java/Kotlin layer running inside system_server that manages activities, windows, displays, and the View tree apps render into.
Chapters in this Part
20-system-server.md— SystemServer.java, the four boot phases, service registration, Watchdog, lifecycle management, shutdown sequence21-intent-system.md— Intent matching, IntentFilter, IntentResolver, PackageManager queries, package visibility, intent verification22-activity-and-window.md— ActivityTaskManagerService, WindowManagerService, activity lifecycle state machine, task/stack model, splash screens23-window-system.md— WindowState, SurfaceControl, input dispatching, focus tracking, IME insets, transitions24-display-system.md— DisplayManagerService, logical vs. physical displays, color modes, HDR, brightness curves, refresh-rate switching25-view-system.md— View hierarchy, measure/layout/draw, Canvas/RenderNode, hardware acceleration, accessibility hooks
When to load which chapter
- Question mentions system_server, boot phases, ServiceManager, Watchdog →
20-system-server.md - Question mentions Intent matching, IntentFilter, IntentResolver, package visibility →
21-intent-system.md - Question mentions ATM, WMS, activity lifecycle, splash screen, task/stack →
22-activity-and-window.md - Question mentions WindowState, SurfaceControl, input dispatch, focus, IME →
23-window-system.md - Question mentions DisplayManager, displays, HDR, refresh rate, brightness →
24-display-system.md - Question mentions View, ViewGroup, measure/layout/draw, Canvas, RenderNode →
25-view-system.md