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 sequence
• 21-intent-system.md — Intent matching, IntentFilter, IntentResolver, PackageManager queries, package visibility, intent verification
• 22-activity-and-window.md — ActivityTaskManagerService, WindowManagerService, activity lifecycle state machine, task/stack model, splash screens
• 23-window-system.md — WindowState, SurfaceControl, input dispatching, focus tracking, IME insets, transitions
• 24-display-system.md — DisplayManagerService, logical vs. physical displays, color modes, HDR, brightness curves, refresh-rate switching
• 25-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