ScreenShot in ICS Android frameworks

Screenshot Proccess in Android Frameworks

Call interceptKeyBeforeQueueing from Navite Layer InputDispatcher 
InputManager#interceptKeyBeforeQueueing
 - PhoneWindowManager#interceptKeyBeforeQueueing
  - interceptKeyBeforeQueueing
    - interceptScreenshotChord()
      - mScreenshotChordLongPress#run
        - takeScreenshot()
            TakeScreenshotService of new Service in SystemUI
            - run()
              - GlobalScreenshot#takeScreenshot
                called Surface.screenshot to get Bitmap
                Animation and Save Screen Image!!

Check source!!

\frameworks\base\services\input
- InputDispatcher.cpp
- InputManager.cpp

\frameworks\base\policy\src\com\android\internal\policy\impl
- PhoneWindowManager.java

\frameworks\base\packages\SystemUI\src\com\android\systemui\screenshot
- GlobalScreenshot.java
- TakeScreenshotService.java