Introduce Android UI System in Framework layer

1. Android's GUI system and experience
sharing
John Lu
2012/04/13

2. Agenda

Android GUI System architecture

Review: Service and Binder

How to start a application

Draw the application's view

SurfaceView for application's state

Experience sharing

3. Android GUI System architecture

4. Android GUI System architecture

5. Android GUI System architecture
Example

6. Review: Service and Binder

SDK-Service and Kernel-Service

Android's IPC: Binder

7. How to start a application

ActivityManagerService to start a applictation
process and start Activity.

When Application start that mean a Activity
start.

8. How to start a application
Start Process

9. How to start a application

A ActivityThread attach to ActivityManagerService.

From ActivityManagerService to start Activity.

10. Draw the application's view

SetContentView() in Activity.onCreate().

When create the surface?

When to draw our application view.

11. Surface for application's state

Surface's life is control by WindowManagerService.

Application's state will relate to surface.

12. Draw the application's view

13. Surface for application's state
WindowManagerService::relayoutWindow()
{
…
Surface = win.createSurfaceLocked();
// win is WindowState that create in WidowSession.add()
…
}

14. Surface for application's state
SurfaceSession

15. Experience sharing

AsyncTask dosen't work (Unidentified reason).

Dynamic Broadcast Receiver register and
unregister in Activity.

Surface used between in Create and Destroy.

Split the file in Assets if file over 1MByte.

Except the construct view object always work
between in onStart and onStop.

16. Experience sharing

onItemClick(AdapterView adapter, View
v, int position, int id), id is you need.

Dialog dismiss

Android Developers is your best friend
like Google. (e.g., Dev Guide, Resource,
etc.)

17. Summary

Android application manager is
ActivityManagerService.

Application GUI manager is
WindowManagerService.

View create need to before Activity resume.

Surface running between be created and
be destroyed.