Android13硬追startActivity启动流程

因为刚配置了Vscode跳转插件，尝试不借助ai，强行硬追一波源码

Activity 启动流程（冷启动链路，AMS / ATMS → WMS）

bash 复制代码

 Activity
  startActivityAsCaller

ActivityTaskManagerService
  startActivityAsCaller
  execute

ActivityStarter
  execute
  executeRequest
  startActivityUnchecked
  startActivityInner
  resumeFocusedTasksTopActivities

RootWindowContainer
  resumeFocusedTasksTopActivities
  resumeHomeActivity
  startHomeOnTaskDisplayArea
  startHomeActivity
  resumeTopActivityUncheckedLocked

Task
  resumeTopActivityUncheckedLocked
  resumeTopActivityInnerLocked

TaskFragment
  resumeTopActivityInnerLocked
  resumeTopActivity
  startProcessAsync

ActivityTaskManagerService
  startProcessAsync
  ActivityManagerInternal::startProcess

ActivityManagerService
   LocalService extends ActivityManagerInternal
      startProcess
      startProcessLocked
      
ProcessList
  startProcessLocked
  startProcess
  Process             start

Process
  start
  usesWebviewZygote   startWebView
  usesAppZygote       appZygote.getProcess().start

ZygoteProcess
  start
  startViaZygote

ZygoteConnection
  processCommand
    Zygote
      forkAndSpecialize
  handleChildProc
  zygoteInit

ZygoteInit
  zygoteInit
  applicationInit

RuntimeInit
  applicationInit
  findStaticMain
  m = cl.getMethod("main", new Class[] { String[].class });

ActivityThread
  main(String[] args)

4.3 可渲染 Mermaid classDiagram

#mermaid-svg-nIfsTL17G5qRkZQu{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-nIfsTL17G5qRkZQu .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-nIfsTL17G5qRkZQu .error-icon{fill:#552222;}#mermaid-svg-nIfsTL17G5qRkZQu .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-nIfsTL17G5qRkZQu .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-nIfsTL17G5qRkZQu .marker{fill:#333333;stroke:#333333;}#mermaid-svg-nIfsTL17G5qRkZQu .marker.cross{stroke:#333333;}#mermaid-svg-nIfsTL17G5qRkZQu svg{font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-nIfsTL17G5qRkZQu p{margin:0;}#mermaid-svg-nIfsTL17G5qRkZQu g.classGroup text{fill:#9370DB;stroke:none;font-family:"trebuchet ms",verdana,arial,sans-serif;font-size:10px;}#mermaid-svg-nIfsTL17G5qRkZQu g.classGroup text .title{font-weight:bolder;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster-label text{fill:#333;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster-label span{color:#333;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster-label span p{background-color:transparent;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster text{fill:#333;}#mermaid-svg-nIfsTL17G5qRkZQu .cluster span{color:#333;}#mermaid-svg-nIfsTL17G5qRkZQu .nodeLabel,#mermaid-svg-nIfsTL17G5qRkZQu .edgeLabel{color:#131300;}#mermaid-svg-nIfsTL17G5qRkZQu .edgeLabel .label rect{fill:#ECECFF;}#mermaid-svg-nIfsTL17G5qRkZQu .label text{fill:#131300;}#mermaid-svg-nIfsTL17G5qRkZQu .labelBkg{background:#ECECFF;}#mermaid-svg-nIfsTL17G5qRkZQu .edgeLabel .label span{background:#ECECFF;}#mermaid-svg-nIfsTL17G5qRkZQu .classTitle{font-weight:bolder;}#mermaid-svg-nIfsTL17G5qRkZQu .node rect,#mermaid-svg-nIfsTL17G5qRkZQu .node circle,#mermaid-svg-nIfsTL17G5qRkZQu .node ellipse,#mermaid-svg-nIfsTL17G5qRkZQu .node polygon,#mermaid-svg-nIfsTL17G5qRkZQu .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-nIfsTL17G5qRkZQu .divider{stroke:#9370DB;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu g.clickable{cursor:pointer;}#mermaid-svg-nIfsTL17G5qRkZQu g.classGroup rect{fill:#ECECFF;stroke:#9370DB;}#mermaid-svg-nIfsTL17G5qRkZQu g.classGroup line{stroke:#9370DB;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu .classLabel .box{stroke:none;stroke-width:0;fill:#ECECFF;opacity:0.5;}#mermaid-svg-nIfsTL17G5qRkZQu .classLabel .label{fill:#9370DB;font-size:10px;}#mermaid-svg-nIfsTL17G5qRkZQu .relation{stroke:#333333;stroke-width:1;fill:none;}#mermaid-svg-nIfsTL17G5qRkZQu .dashed-line{stroke-dasharray:3;}#mermaid-svg-nIfsTL17G5qRkZQu .dotted-line{stroke-dasharray:1 2;}#mermaid-svg-nIfsTL17G5qRkZQu #compositionStart,#mermaid-svg-nIfsTL17G5qRkZQu .composition{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #compositionEnd,#mermaid-svg-nIfsTL17G5qRkZQu .composition{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #dependencyStart,#mermaid-svg-nIfsTL17G5qRkZQu .dependency{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #dependencyStart,#mermaid-svg-nIfsTL17G5qRkZQu .dependency{fill:#333333!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #extensionStart,#mermaid-svg-nIfsTL17G5qRkZQu .extension{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #extensionEnd,#mermaid-svg-nIfsTL17G5qRkZQu .extension{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #aggregationStart,#mermaid-svg-nIfsTL17G5qRkZQu .aggregation{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #aggregationEnd,#mermaid-svg-nIfsTL17G5qRkZQu .aggregation{fill:transparent!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #lollipopStart,#mermaid-svg-nIfsTL17G5qRkZQu .lollipop{fill:#ECECFF!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu #lollipopEnd,#mermaid-svg-nIfsTL17G5qRkZQu .lollipop{fill:#ECECFF!important;stroke:#333333!important;stroke-width:1;}#mermaid-svg-nIfsTL17G5qRkZQu .edgeTerminals{font-size:11px;line-height:initial;}#mermaid-svg-nIfsTL17G5qRkZQu .classTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-nIfsTL17G5qRkZQu .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-nIfsTL17G5qRkZQu .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-nIfsTL17G5qRkZQu :root{--mermaid-font-family:"trebuchet ms",verdana,arial,sans-serif;} Activity
ContextThemeWrapper
ContextWrapper
Context
Instrumentation
ActivityThread
ApplicationThread
ClientTransactionHandler
ATMS
AMS
WMS
ActivityStartController
ActivityStarter
RootWindowContainer
ActivityTaskSupervisor
ActivityRecord
WindowProcessController
ProcessList
ClientLifecycleManager
ClientTransaction
LaunchActivityItem
ResumeActivityItem
ViewRootImpl
WindowManagerGlobal