Android Graphics Architecture

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1、AndroidGraphicsArchitectureI1.LaunchanewActivity2.CreateanewwindowfortheActivityandregisteritattheWindowManagerService3.CreateanewsurfacefortheActivity‘swindowandhanditovertotheActivity4.DrawtheActivity‘sviewhierarchyintotheoffscreensurface(layer)5.Compositeallvisibleoffscree

2、nsurfacesontothedisplayWindowManager2Service(ProcessA)ActivityManager1App3Service(ZygotechildprocessB)(ProcessA)ViewRootSurfaceFlinger(ViewHierarchy)(ProcessC)4LayerStackDecorView(FrameLayout)5compositingContentView(FrameLayout)LinearLayoutTextViewImageAndroidGraphicsArchite

3、ctureII01.ActivityManagerService.startActivity02.Activity.attachPolicyManager.makeNewWindow03.ViewRoot.setViewWindowManagerService.addWindow04.ViewRoot.performTraversalsPhoneWindow.DecorView.measure05.ViewRoot.relayoutWindowWindowManagerService.relayoutWindow(fetchesthesu

4、rfacecreatedbytheWMSalsointoprocessB)06.WindowManagerService.WindowState.createSurfaceLockedSurfaceFlinger.createSurface07.SurfaceFlinger.addLayer_l08.ViewRoot.performTraversalsPhoneWindow.DecorView.layout09.ViewRoot.performTraversalsViewRoot.drawSurface.lockCanvas(mmapra

5、wsurfacememoryintoprocessB)WindowManager10.Surface.unlockCanvasAndPost3,511.SurfaceFlinger.threadLoopSurfaceFlinger.composeSurfacesService12.ViewRoot.finishDrawingWindowManagerService.finishDrawingWindow(ProcessA)ActivityManagerApp(Activity)61Service2(ZygotechildprocessB)(P

6、rocessA)7ViewRoot(ViewHierarchy)SurfaceFlinger4,8,9,12(ProcessC)10LayerStackDecorView(FrameLayout)11compositingContentView(FrameLayout)LinearLayoutTextViewImageActivity.attachCallStack:Activity.attach(Activity.java)Activity.attachBaseContext(PhoneWindow.java)PolicyManager.ma

7、keNewWindow(PolicyManager.java)createstheActivity‘sPhoneWindowtheUIthreadissettothecallingthreadwhichistheActivity‘smainthreadWindow.setWindowManager(Window.java)createstheWindows‘sWindow.LocalWindowManagerinstanceActivity.setContentViewCallStack:Activity.setContentView(Ac

8、tivity.java)PhoneWindow.setContentView(PhoneWindow.java)PhoneWindow.