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App窗口创建流程（Android12 ）

news 2025/1/8 9:41:00

有关的窗口对象

PhoneWindow	ActivityThread#performLaunchActivity {Activity.attach}
Surface	new ViewRootImpl 创建null对象 mSurface.transferFrom(getOrCreateBLASTSurface())//填充内容创建native层的Surface
Layer	SurfaceFlinger::createLayer
RenderSurface	SurfaceFlinger gpu合成layer之后的数据管理类
FramebufferSurface	Framebuffer管理类，负责消费合成的layer数据，送显
SurfaceControl	ViewRootImpl#relayoutWindow{mSurface.copyFrom(mSurfaceControl)} //改变Surface buffer属性
IWindowSession	new ViewRootImpl(contexst, display, WindowManagerGlobal.getWindowSession())
WindowManagerGlobal	ActivityThread#handleLaunchActivity {WindowManagerGlobal.initialize()}

Launcher#startActivity() -> SystemServer -> zygote newProcess

->App #newActivityThread.main() ->ActivityThread#handleLaunchActivity

-> ActivityThread.performLaunchActivity

{

WindowManagerGlobal.initialize()

newActivity().attach(context)

}

->ActivityThread#handleResumeActivity->wm.addView(decor

->WindowManagerGlobal.addView(WindowManagerGlobal.setView

{
new ViewRootImpl()#setView -> requestlayout -> performTraversals -> relayoutWindow()

mWindowSession.relayout(mSurfaceControl -> wms.relayout 开始创建SurfaceControl和Layer

}

mWindowSession.relayout(mSurfaceControl
-> wms.createSurfaceControl()
->mSurfaceControl = WindowStateAnimator.createSurfaceLocked//开始创建Surface
->mSurface.copyFrom(mSurfaceControl) //把mSurfaceControl复制到ViewRootImpl对象的mSurface里面后续操作window使用

从wms.createSurfaceLocked ~ SurfaceFlinger::createLayer 如图所示