服装…

忽然有一天我想要做一件事去代码中去验证那些曾经被“灌输”的理论。

VWJB6995

启动主流程为主当然对于一些关键方法还是会着重介绍这样以后如果有遇到相关问题的修改可以通过这篇文章找到具体代码位置然后根据具体的问题分析修改。

Activity

bug但是涉及到了通话那么他需要找到通讯组的同事来处理这个问题。

但公司很大他并不知道通讯模块是谁负责更不知道这个问题需要交给通讯组具体的哪个同事处理那么他只需要将自己的要求向公司领导管理着汇报需要通讯组的同事处理这个问题。

当前例子设计到

和通讯2个模块的开发人员还涉及到公司的管理者。

在Activity

来说他们并不知道对方模块的业务所以这一流程需要AMS来做管理。

并且这3个模块也对应3个进程当前案例来说分别为Launcher

进程电话进程system_service

ActivityTaskSupervisor::startSpecificActivity

方法这个时候进程还没创建完毕则不会执行

ActivityTaskSupervisor::realStartActivityLocked

而是会再触发进程创建当然之前已经触发过来这次触发不会真的再创建进行了。

ActivityTaskSupervisor::realStartActivityLocked

pause

ActivityTaskSupervisor::realStartActivityLocked

pause

ActivityTaskSupervisor::startSpecificActivity

TargetActivity

ItemClickHandler::onClickItemClickHandler::onClickAppShortcutItemClickHandler::startAppShortcutOrInfoActivityQuickstepLauncher::startActivitySafelyLauncher::startActivitySafelyAppLauncher::startActivitySafelyBaseQuickstepLauncher::getActivityLaunchOptions

Option

共用启动Activity流程Activity::startActivityActivity::startActivityActivity::startActivityForResultInstrumentation::execStartActivityActivityTaskManagerService::startActivity

跨进程画成时序图

Instrumentation::execStartActivity

然后开始跨进程与

BaseQuickstepLauncher::getActivityLaunchOptions

ActivityOptions

Activity::startActivityForResult

2.2

Activity::startActivityForResult

然后在

startActivityForResult(RequiresPermission

Intent

transferSpringboardActivityOptions(options);Instrumentation.ActivityResult

mInstrumentation.execStartActivity(this,

mMainThread.getApplicationThread(),

mToken,

ActivityTaskManager.getService().startActivity(whoThread,who.getOpPackageName(),

intent,intent.resolveTypeIfNeeded(who.getContentResolver()),

token,target

对跨进程启动的结果做checkcheckStartActivityResult(result,

intent);......}Instrumentation::checkStartActivityResult

AndroidManifest.xml

(!ActivityManager.isStartResultFatalError(res))

{return;}switch

ActivityManager.START_INTENT_NOT_RESOLVED:case

ActivityManager.START_CLASS_NOT_FOUND:

(intent

((Intent)intent).getComponent()

null)throw

ActivityNotFoundException(Unable

find

((Intent)intent).getComponent().toShortString()

have

ActivityManager.START_PERMISSION_DENIED:throw

new

ActivityManager.START_FORWARD_AND_REQUEST_CONFLICT:throw

new

AndroidRuntimeException(FORWARD_RESULT_FLAG

used

ActivityManager.START_NOT_ACTIVITY:throw

new

IllegalArgumentException(PendingIntent

not

ActivityManager.START_NOT_VOICE_COMPATIBLE:throw

new

ActivityManager.START_VOICE_NOT_ACTIVE_SESSION:throw

new

ActivityManager.START_VOICE_HIDDEN_SESSION:throw

new

ActivityManager.START_ASSISTANT_NOT_ACTIVE_SESSION:throw

new

ActivityManager.START_ASSISTANT_HIDDEN_SESSION:throw

new

ActivityManager.START_CANCELED:throw

new

AndroidRuntimeException(Activity

could

AndroidRuntimeException(Unknown

error

吧当然还有其他很多参数比如是谁发起的请求requestCode等等这些参数都是应用端带过来的。

system_service

Request

Instrumentation::execStartActivity

system_service

ActivityTaskManagerService::startActivityActivityTaskManagerService::startActivityAsUserActivityTaskManagerService::startActivityAsUserActivityStartController::obtainStarterActivityStarter::executeActivityStarter$Request::resolveActivity

解析启动请求参数ActivityStarter::executeRequest

3.3

创建ActivityRecordActivityStarter::startActivityUncheckedActivityStarter::startActivityInner

3.4

关键函数startActivityInnerActivityStarter::getOrCreateRootTask

3.4.1

移动Task到栈顶RootWindowContainer::resumeFocusedTasksTopActivities

--3.4.4

显示ActivityTask::resumeTopActivityUncheckedLockedTask::resumeTopActivityInnerLockedTaskFragment::resumeTopActivity

显示顶层ActivityTaskDisplayArea::pauseBackTasks

pause

ActivityTaskManagerService::startProcessAsync

创建“电话”进程时序图

ActivityTaskManagerService::startActivity

ActivityTaskManagerService::startActivityAsUser

这个方法比较重要在这里会构建一个

ActivityTaskManagerServiceprivate

int

startActivityAsUser(IApplicationThread

caller,

返回的是ActivityStartControllerreturn

getActivityStartController().obtainStarter(intent,

startActivityAsUser).setCaller(caller).setCallingPackage(callingPackage).setCallingFeatureId(callingFeatureId).setResolvedType(resolvedType).setResultTo(resultTo).setResultWho(resultWho).setRequestCode(requestCode).setStartFlags(startFlags).setProfilerInfo(profilerInfo).setActivityOptions(bOptions).setUserId(userId).execute();}ActivityStartController

{return

mActivityStartController;}ActivityStartController::obtainStarter

ActivityStarter

返回ActivityStarterActivityStarter

obtainStarter(Intent

mFactory.obtain().setIntent(intent).setReason(reason);}所以在

ActivityTaskManagerService::startActivityAsUser

build

ActivityStarter::executeRequest

setCallingPackage

解析请求数据mRequest.resolveActivity(mSupervisor);}......//

执行启动Activity请求res

executeRequest(mRequest);......}build

模式会把参数设置到

ActivityStarter::setActivityInfo

null

ActivityStarter$RequestResolveInfo

activityInfo;void

resolveActivity(ActivityTaskSupervisor

supervisor)

supervisor.resolveIntent(intent,

resolvedType,

*/,computeResolveFilterUid(callingUid,

realCallingUid,

filterCallingUid),realCallingPid);......//

解析activityInfo

supervisor.resolveActivity(intent,

resolveInfo,

startFlags,profilerInfo);......}TargetActivity

TargetActivity

ActivityStarter::executeRequest

ActivityRecord

request.activityInfo;ResolveInfo

rInfo

日志request.logMessage.append(START

{).append(intent.toShortString(true,

true,

).append(launchModeToString(launchMode)).append(

from

Request.DEFAULT_REAL_CALLING_UID)

(realCallingUid).append(realCallingUid).append());}}......//

重点*

ActivityRecord.Builder(mService).setCaller(callerApp).setLaunchedFromPid(callingPid).setLaunchedFromUid(callingUid).setLaunchedFromPackage(callingPackage).setLaunchedFromFeature(callingFeatureId).setIntent(intent).setResolvedType(resolvedType).setActivityInfo(aInfo).setConfiguration(mService.getGlobalConfiguration()).setResultTo(resultRecord).setResultWho(resultWho).setRequestCode(requestCode).setComponentSpecified(request.componentSpecified).setRootVoiceInteraction(voiceSession

null).setActivityOptions(checkedOptions).setSourceRecord(sourceRecord).build();......//

重点*

继续执行startActivityUncheckedmLastStartActivityResult

sourceRecord,

voiceSession,request.voiceInteractor,

startFlags,

ActivityRecord(ActivityTaskManagerService

_service,

Tokensuper(_service.mWindowManager,

new

info.applicationInfo.packageName;.....}这里的重点其实就是创建了一个匿名

Token

WindowToken(WindowManagerService

service,

WindowToken(WindowManagerService

service,

ownerCanManageAppTokens,boolean

boolean

ActivityStarter::startActivityUnchecked

ActivityStarter::startActivityInner

3.4

ActivityStarter::startActivityInner

Activity

启动流程最重要的函数之一这里涉及到【窗口层级树】相关知识上一小节说了

ActivityRecord

一样挂载到层级树中而是需要单独处理本小节就是看这一块是如何处理的。

先看看正常在

还移动到了DefaultTaskDisplayArea的最顶部,这里涉及到的操作如下

Task

上的这个属于窗口显示第一步-addWindow流程当前就不单独分析了。

继续看主流程代码

sourceRecord,IVoiceInteractionSession

voiceSession,

restrictedBgActivity,NeededUriGrants

intentGrants)

computeTargetTask内部会根据具体条件返回Task比如标志位FLAG_ACTIVITY_NEW_TASK

就需要重新创建Task

null因为是新启动的应用所以computeTargetTask也找不到task最终也为nullfinal

Task

getOrCreateRootTask(mStartActivity,

mLaunchFlags,

进行绑定setNewTask(taskToAffiliate);}

else

{addOrReparentStartingActivity(targetTask,

adding

mTargetRootTask.getRootTask().moveToFront(reuseOrNewTask,

(mDoResume)

falsemRootWindowContainer.resumeFocusedTasksTopActivities(mTargetRootTask,

mStartActivity,

getOrCreateRootTask获取或者创建Task但是当前场景肯定是创建一个热启动是获取。

另外

Task

创建的时候就会挂载到层级树中也就是会挂载到DefaultTaskDisplayArea

ActivityRecord

不过当前场景建好就已经是栈顶了其实这一步没做什么这点后面代码会分析

Activity

ActivityStarter::getOrCreateRootTaskRootWindowContainer::getOrCreateRootTaskRootWindowContainer::getOrCreateRootTaskTaskDisplayArea::getOrCreateRootTaskTaskDisplayArea::getOrCreateRootTaskTask::Build

---创建Task开始看代码

getOrCreateRootTask(ActivityRecord

int

!aOptions.getAvoidMoveToFront())

Task

mRootWindowContainer.getOrCreateRootTask(r,

aOptions,

LaunchParamsController.LaunchParams

launchParams,

taskDisplayArea.getDisplayId()))

{//

taskDisplayArea.getOrCreateRootTask(r,

options,

TaskDisplayArea::getOrCreateRootTask

TaskDisplayAreaTask

candidateTask.getRootTask();}......//

new

Task.Builder(mAtmService).setWindowingMode(windowingMode).setActivityType(activityType).setOnTop(onTop).setParent(this)

主要这个this被设置为Parent。

所以直接挂载到了DefaultTaskDisplayArea下.setSourceTask(sourceTask).setActivityOptions(options).setLaunchFlags(launchFlags).build();}看方法名是获取或创建

Task

就是层级结构树应用所在的名为“DefaultTaskDisplayArea”的

TaskDisplayArea

{validateRootTask((TaskDisplayArea)

mParent);}......//

buildInner();task.mHasBeenVisible

mHasBeenVisible;//

TaskDisplayArea#addRootTaskReferenceIfNeeded().if

(mActivityType

{task.setActivityType(mActivityType);}//

重点*

mParent;parentTask.addChild(task,

mOnTop

POSITION_BOTTOM,(mActivityInfo.flags

0);}

{task.setWindowingMode(mWindowingMode,

true

mAutoRemoveRecents,mAskedCompatMode,

mUserId,

mLastTimeMoved,mNeverRelinquishIdentity,

mLastSnapshotData,mTaskAffiliation,

mCallingFeatureId,

mSupportsPictureInPicture,mRealActivitySuspended,

mUserSetupComplete,

mCreatedByOrganizer,mLaunchCookie,

mDeferTaskAppear,

mRemoveWithTaskOrganizer);}3.4.1.1

buildInner

RootWindowContainer::getOrCreateRootTask

log

ActivityRecord挂载到Task–setNewTask

调用链

ActivityStarter::setNewTaskActivityStarer::addOrReparentStartingActivity

主流程代码

就是mTargetRootTask,也就是刚刚创建的Taskfinal

Task

mTargetRootTask.reuseOrCreateTask(mNewTaskInfo

null

mStartActivity.info,mNewTaskIntent

null

mVoiceSession,mVoiceInteractor,

toTop,

mOptions);task.mTransitionController.collectExistenceChange(task);//

ActivityRecord的挂载addOrReparentStartingActivity(task,

setTaskFromReuseOrCreateNewTask);//

需要注意这里的日志打印ProtoLog.v(WM_DEBUG_TASKS,

Starting

{mStartActivity.setTaskToAffiliateWith(taskToAffiliate);}}这里的

Task

ActivityStarer::addOrReparentStartingActivity

void

addOrReparentStartingActivity(NonNull

Task

(mStartActivity.getTaskFragment()

null||

mStartActivity.getTaskFragment()

newParent)

ActivityRecord挂在到新创建的Task中并且是顶部newParent.addChild(mStartActivity,

POSITION_TOP);}

{mStartActivity.reparent(newParent,

top

也是挂在到其顶部。

所以这个函数其实没有什么实际操作。

但是对于其他场景这里也是一个重点方法。

调用链

Task::moveToFrontTask::moveToFrontInnerTaskDisplayArea::positionChildAtTaskDisplayArea::positionChildTaskAtActivityTaskSupervisor::updateTopResumedActivityIfNeededActivityRecord::onTopResumedActivityChanged

--触发TopResumedActivityChangeItem主流程代码

Task

ActivityStarter::startActivityInner

targetTask

mTargetRootTask.getRootTask().moveToFront(reuseOrNewTask,

targetTask);已知

{return;}mTransitionController.recordTaskOrder(this);final

TaskDisplayArea

visible.taskDisplayArea.moveHomeRootTaskToFront(reason

returnToHome);}final

taskDisplayArea.getFocusedRootTask()

null;if

的最前面task.getParent().positionChildAt(POSITION_TOP,

task,

*/);taskDisplayArea.updateLastFocusedRootTask(lastFocusedTask,

Task

显示Activity–resumeFocusedTasksTopActivities

Activity

RootWindowContainer::resumeFocusedTasksTopActivities

执行调用链如下

RootWindowContainer::resumeFocusedTasksTopActivitiesTask::resumeTopActivityUncheckedLockedTask::resumeTopActivityInnerLockedTaskFragment::resumeTopActivity

TaskDisplayArea::pauseBackTasks

pause

WindowContainer::forAllLeafTaskTaskFragment::forAllLeafTaskFragmentsTaskFragment::startPausingTaskFragment::startPausingTaskFragment::schedulePauseActivity

--构建

PauseActivityItem这里是触发暂停launchActivityTaskManagerService::startProcessAsync

创建“电话”进程重点方法在

TaskFragment::resumeTopActivity

第四个参数为

resumeFocusedTasksTopActivities(Task

targetRootTask,

(targetRootTask.isTopRootTaskInDisplayArea()||

targetRootTask))

targetRootTask.resumeTopActivityUncheckedLocked(target,

targetOptions,deferPause);}......}

Taskboolean

resumeTopActivityUncheckedLocked(ActivityRecord

prev,

resumeTopActivityInnerLocked(prev,

options,

resumeTopActivityInnerLocked(ActivityRecord

prev,

topFragment.resumeTopActivity(prev,

options,

TaskFragment::resumeTopActivity