stack与task抽象模型
activity在service端时 activityRecord 他被task管理,task又被stack管理
内存中是以如下抽象的方式存储,方便框架创建查找管理等等之类的功能.
堆栈.png
看一下dumpsys中看到的真实情况,一般情况下launcher占用了stack #0,
adb shell dumpsys activity activities
字段说明:
type=standard 这个不用说明,最常见的
type=home 很显然,这个是launcher
mode = fullscreen 这个是说当前activity是全屏的,如果了解 分屏 与 freeform, pip 那么对应的值也不同
比如:
mode=split-screen-secondary 分屏
mode=freeform 自由窗口
mode=pinned pip视频画中画
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #506: type=standard mode=fullscreen
isSleeping=false
mBounds=Rect(0, 0 - 0, 0)
Task id #498
mBounds=Rect(0, 0 - 0, 0)
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{ac6fa42 #498 A=com.douban.frodo U=0 StackId=506 sz=2}
userId=0 effectiveUid=u0a193 mCallingUid=u0a193 mUserSetupComplete=true mCallingPackage=com.douban.frodo
affinity=com.douban.frodo
intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.douban.frodo/.activity.SplashActivity}
mActivityComponent=com.douban.frodo/.activity.SplashActivity
autoRemoveRecents=false isPersistable=true numFullscreen=2 activityType=1
rootWasReset=true mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{98eb699 u0 com.douban.frodo/.MainActivity t498}, ActivityRecord{8491c91 u0 com.douban.frodo/.group.activity.GroupTopicActivity t498}]
askedCompatMode=false inRecents=true isAvailable=true
mRootProcess=ProcessRecord{9b4fda2 2961:com.douban.frodo/u0a193}
stackId=506
hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE mSupportsPictureInPicture=false isResizeable=true lastActiveTime=588689289 (inactive for 13s)
* Hist #1: ActivityRecord{8491c91 u0 com.douban.frodo/.group.activity.GroupTopicActivity t498}
packageName=com.douban.frodo processName=com.douban.frodo
launchedFromUid=10193 launchedFromPackage=com.douban.frodo userId=0
app=ProcessRecord{9b4fda2 2961:com.douban.frodo/u0a193}
Intent { cmp=com.douban.frodo/.group.activity.GroupTopicActivity (has extras) }
frontOfTask=false task=TaskRecord{ac6fa42 #498 A=com.douban.frodo U=0 StackId=506 sz=2}
taskAffinity=com.douban.frodo
mActivityComponent=com.douban.frodo/.group.activity.GroupTopicActivity
baseDir=/data/app/com.douban.frodo-Fi3_ei5LS2d4dA3_S35NSQ==/base.apk
dataDir=/data/user/0/com.douban.frodo
stateNotNeeded=false componentSpecified=true mActivityType=standard
compat={480dpi} labelRes=0x0 icon=0x7f0e0000 theme=0x7f11025b
mLastReportedConfigurations:
mGlobalConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.21225 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
mOverrideConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.1 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
CurrentConfiguration={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.1 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
taskDescription: label="null" icon=null iconResource=0 iconFilename=null primaryColor=ff42bd56
backgroundColor=fffafafa
statusBarColor=ffffffff
navigationBarColor=ffffffff
launchFailed=false launchCount=0 lastLaunchTime=-5m36s719ms
haveState=false icicle=null
state=RESUMED stopped=false delayedResume=false finishing=false
keysPaused=false inHistory=true visible=true sleeping=false idle=true mStartingWindowState=STARTING_WINDOW_REMOVED
fullscreen=true noDisplay=false immersive=false launchMode=0
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=standard
nowVisible=true lastVisibleTime=-13s441ms
resizeMode=RESIZE_MODE_RESIZEABLE
mLastReportedMultiWindowMode=false mLastReportedPictureInPictureMode=false
* Hist #0: ActivityRecord{98eb699 u0 com.douban.frodo/.MainActivity t498}
packageName=com.douban.frodo processName=com.douban.frodo
launchedFromUid=10193 launchedFromPackage=com.douban.frodo userId=0
app=ProcessRecord{9b4fda2 2961:com.douban.frodo/u0a193}
Intent { flg=0x10000000 cmp=com.douban.frodo/.MainActivity }
frontOfTask=true task=TaskRecord{ac6fa42 #498 A=com.douban.frodo U=0 StackId=506 sz=2}
taskAffinity=com.douban.frodo
mActivityComponent=com.douban.frodo/.MainActivity
baseDir=/data/app/com.douban.frodo-Fi3_ei5LS2d4dA3_S35NSQ==/base.apk
dataDir=/data/user/0/com.douban.frodo
stateNotNeeded=false componentSpecified=true mActivityType=standard
compat={480dpi} labelRes=0x7f1000e4 icon=0x7f0e0000 theme=0x7f11025c
mLastReportedConfigurations:
mGlobalConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.21225 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
mOverrideConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.2 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
CurrentConfiguration={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_0} s.2 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
taskDescription: label="null" icon=null iconResource=0 iconFilename=null primaryColor=ff42bd56
backgroundColor=fffafafa
statusBarColor=ffffffff
navigationBarColor=ffffffff
launchFailed=false launchCount=0 lastLaunchTime=-6m44s526ms
haveState=true icicle=Bundle[mParcelledData.dataSize=25092]
state=STOPPED stopped=true delayedResume=false finishing=false
keysPaused=false inHistory=true visible=false sleeping=false idle=true mStartingWindowState=STARTING_WINDOW_NOT_SHOWN
fullscreen=true noDisplay=false immersive=false launchMode=2
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=standard
nowVisible=false lastVisibleTime=-5m41s249ms
resizeMode=RESIZE_MODE_RESIZEABLE
mLastReportedMultiWindowMode=false mLastReportedPictureInPictureMode=false
Running activities (most recent first):
TaskRecord{ac6fa42 #498 A=com.douban.frodo U=0 StackId=506 sz=2}
Run #1: ActivityRecord{8491c91 u0 com.douban.frodo/.group.activity.GroupTopicActivity t498}
Run #0: ActivityRecord{98eb699 u0 com.douban.frodo/.MainActivity t498}
mResumedActivity: ActivityRecord{8491c91 u0 com.douban.frodo/.group.activity.GroupTopicActivity t498}
mLastPausedActivity: ActivityRecord{4b6e7cf u0 com.douban.frodo/.activity.SplashActivity t-1 f}
Stack #0: type=home mode=fullscreen
isSleeping=false
mBounds=Rect(0, 0 - 0, 0)
Task id #5
mBounds=Rect(0, 0 - 0, 0)
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{3859883 #5 A=cn.nubia.launcher U=0 StackId=0 sz=1}
userId=0 effectiveUid=u0a82 mCallingUid=u0a226 mUserSetupComplete=true mCallingPackage=com.tencent.mm
affinity=cn.nubia.launcher
intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10200000 cmp=cn.nubia.launcher/com.android.launcher3.Launcher}
mActivityComponent=cn.nubia.launcher/com.android.launcher3.Launcher
autoRemoveRecents=false isPersistable=true numFullscreen=1 activityType=2
rootWasReset=true mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{a912b91 u0 cn.nubia.launcher/com.android.launcher3.Launcher t5}]
askedCompatMode=false inRecents=true isAvailable=true
mRootProcess=ProcessRecord{214e5fd 4555:cn.nubia.launcher/u0a82}
stackId=0
hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE mSupportsPictureInPicture=false isResizeable=true lastActiveTime=586297911 (inactive for 2405s)
* Hist #0: ActivityRecord{a912b91 u0 cn.nubia.launcher/com.android.launcher3.Launcher t5}
packageName=cn.nubia.launcher processName=cn.nubia.launcher
launchedFromUid=1000 launchedFromPackage=cn.nubia.setupwizard userId=0
app=ProcessRecord{214e5fd 4555:cn.nubia.launcher/u0a82}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10200000 cmp=cn.nubia.launcher/com.android.launcher3.Launcher }
frontOfTask=true task=TaskRecord{3859883 #5 A=cn.nubia.launcher U=0 StackId=0 sz=1}
taskAffinity=cn.nubia.launcher
mActivityComponent=cn.nubia.launcher/com.android.launcher3.Launcher
baseDir=/system/app/nubia_Launcher/nubia_Launcher.apk
dataDir=/data/user_de/0/cn.nubia.launcher
stateNotNeeded=true componentSpecified=true mActivityType=home
compat={480dpi} labelRes=0x7f0a0011 icon=0x7f030003 theme=0x7f1000f1
mLastReportedConfigurations:
mGlobalConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0} s.21225 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
mOverrideConfig={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0} s.436 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
CurrentConfiguration={1.0 460mcc1mnc [zh_CN] ldltr sw360dp w360dp h743dp 480dpi nrml long hdr widecg port finger -keyb/v/h -nav/h winConfig={ mBounds=Rect(0, 0 - 1080, 2340) mAppBounds=Rect(0, 0 - 1080, 2340) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0} s.436 themeChanged=1 themeChangedFlags=268451851 typefaceTimeStamp=1587924437837}
RequestedOverrideConfiguration={0.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?ldr ?wideColorGamut ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/? winConfig={ mBounds=Rect(0, 0 - 0, 0) mAppBounds=null mWindowingMode=undefined mDisplayWindowingMode=undefined mActivityType=home mAlwaysOnTop=undefined mRotation=undefined} themeChanged=0 themeChangedFlags=0 typefaceTimeStamp=0}
taskDescription: label="null" icon=null iconResource=0 iconFilename=null primaryColor=ffefefef
backgroundColor=fffafafa
statusBarColor=0
navigationBarColor=ffffffff
launchFailed=false launchCount=0 lastLaunchTime=-3d13h10m31s981ms
haveState=true icicle=Bundle[mParcelledData.dataSize=7492]
state=STOPPED stopped=true delayedResume=false finishing=false
keysPaused=false inHistory=true visible=false sleeping=false idle=true mStartingWindowState=STARTING_WINDOW_REMOVED
fullscreen=true noDisplay=false immersive=false launchMode=3
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=home
nowVisible=false lastVisibleTime=-6m48s722ms
connections=com.android.server.wm.ActivityServiceConnectionsHolder@cac0a00
resizeMode=RESIZE_MODE_RESIZEABLE
mLastReportedMultiWindowMode=false mLastReportedPictureInPictureMode=false
Running activities (most recent first):
TaskRecord{3859883 #5 A=cn.nubia.launcher U=0 StackId=0 sz=1}
Run #0: ActivityRecord{a912b91 u0 cn.nubia.launcher/com.android.launcher3.Launcher t5}
mLastPausedActivity: ActivityRecord{a912b91 u0 cn.nubia.launcher/com.android.launcher3.Launcher t5}
activity stack查询与创建总体流程图
activity 堆栈创建与查找.jpg
activity查询过程
这里如果查询到,则将栈顶activity拉到前台,如果没有查询到则新建堆栈(有例外的情况我们不讨论)
ActivityStarter.java
private ActivityRecord getReusableIntentActivity() {
// We may want to try to place the new activity in to an existing task. We always
// do this if the target activity is singleTask or singleInstance; we will also do
// this if NEW_TASK has been requested, and there is not an additional qualifier telling
// us to still place it in a new task: multi task, always doc mode, or being asked to
// launch this as a new task behind the current one.
//google注释,相信大家都看得懂
//是否放在已经存在的task中,这里我们在manifast中添加的属性终于被拉出来用了,相信大家在各种面试中被各种花式问activity的四种启动方式.
boolean putIntoExistingTask = ((mLaunchFlags & FLAG_ACTIVITY_NEW_TASK) != 0 &&
(mLaunchFlags & FLAG_ACTIVITY_MULTIPLE_TASK) == 0)
|| isLaunchModeOneOf(LAUNCH_SINGLE_INSTANCE, LAUNCH_SINGLE_TASK);
// If bring to front is requested, and no result is requested and we have not been given
// an explicit task to launch in to, and we can find a task that was started with this
// same component, then instead of launching bring that one to the front.
//继续判断复制
putIntoExistingTask &= mInTask == null && mStartActivity.resultTo == null;
ActivityRecord intentActivity = null;
//这里没看懂,这个判断是干啥的
if (mOptions != null && mOptions.getLaunchTaskId() != -1) {
final TaskRecord task = mRootActivityContainer.anyTaskForId(mOptions.getLaunchTaskId());
intentActivity = task != null ? task.getTopActivity() : null;
} else if (putIntoExistingTask) {
//属性的感觉来了,launcheMode
if (LAUNCH_SINGLE_INSTANCE == mLaunchMode) {
// There can be one and only one instance of single instance activity in the
// history, and it is always in its own unique task, so we do a special search.
intentActivity = mRootActivityContainer.findActivity(mIntent, mStartActivity.info,
mStartActivity.isActivityTypeHome());
} else if ((mLaunchFlags & FLAG_ACTIVITY_LAUNCH_ADJACENT) != 0) {
/*
这个属性看看官方定义,是配合分配使用的
This flag is only used in split-screen multi-window mode. The new activity will be displayed
adjacent to the one launching it. This can only be used in conjunction with
{@link #FLAG_ACTIVITY_NEW_TASK}. Also, setting {@link #FLAG_ACTIVITY_MULTIPLE_TASK}
is
required if you want a new instance of an existing activity to be created.
*/
// For the launch adjacent case we only want to put the activity in an existing
// task if the activity already exists in the history.
intentActivity = mRootActivityContainer.findActivity(mIntent, mStartActivity.info,
!(LAUNCH_SINGLE_TASK == mLaunchMode));
} else {
// Otherwise find the best task to put the activity in.
//其他情况
intentActivity =
mRootActivityContainer.findTask(mStartActivity, mPreferredDisplayId);
}
}
if (intentActivity != null
&& (mStartActivity.isActivityTypeHome() || intentActivity.isActivityTypeHome())
&& intentActivity.getDisplayId() != mPreferredDisplayId) {
// Do not reuse home activity on other displays.
intentActivity = null;
}
return intentActivity;
}
继续查找,这里注意一下,我们是在找activity怎么变成 task了????
findTaskLocked()
void findTaskLocked(ActivityRecord target, FindTaskResult result) {
.......................//省略部分代码
ComponentName cls = intent.getComponent();
if (info.targetActivity != null) {
//这里就是拿到class,是不是很熟悉
cls = new ComponentName(info.packageName, info.targetActivity);
}
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Looking for task of " + target + " in " + this);
//for循环,开始大规模寻找啦
for (int taskNdx = mTaskHistory.size() - 1; taskNdx >= 0; --taskNdx) {
final TaskRecord task = mTaskHistory.get(taskNdx);
if (task.voiceSession != null) {
// We never match voice sessions; those always run independently.
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Skipping " + task + ": voice session");
continue;
}
//userId不同,一切没有意义继续查
if (task.userId != userId) {
// Looking for a different task.
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Skipping " + task + ": different user");
continue;
}
// Overlays should not be considered as the task's logical top activity.
final ActivityRecord r = task.getTopActivity(false /* includeOverlays */);
if (r == null || r.finishing || r.mUserId != userId ||
//熟悉的配方
r.launchMode == ActivityInfo.LAUNCH_SINGLE_INSTANCE) {
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Skipping " + task + ": mismatch root " + r);
continue;
}
.......
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Comparing existing cls="
+ (task.realActivity != null ? task.realActivity.flattenToShortString() : "")
+ "/aff=" + r.getTaskRecord().rootAffinity + " to new cls="
+ intent.getComponent().flattenToShortString() + "/aff=" + info.taskAffinity);
// TODO Refactor to remove duplications. Check if logic can be simplified.
if (task.realActivity != null && task.realActivity.compareTo(cls) == 0
&& Objects.equals(documentData, taskDocumentData)) {
//运气不错,匹配到了哈哈哈
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Found matching class!");
//dump();
if (DEBUG_TASKS) Slog.d(TAG_TASKS,
"For Intent " + intent + " bringing to top: " + r.intent);
result.mRecord = r;
result.mIdealMatch = true;
break;
} else if (affinityIntent != null && affinityIntent.getComponent() != null &&
affinityIntent.getComponent().compareTo(cls) == 0 &&
Objects.equals(documentData, taskDocumentData)) {
//运气也不错
if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Found matching class!");
//dump();
if (DEBUG_TASKS) Slog.d(TAG_TASKS,
"For Intent " + intent + " bringing to top: " + r.intent);
result.mRecord = r;
result.mIdealMatch = true;
break;
} else if {
................................
} else if (DEBUG_TASKS) Slog.d(TAG_TASKS, "Not a match: " + task); //很悲催,没找到
}
}
匹配到堆栈的处理流程
if (reusedActivity != null) {
....................
//熟悉的感觉,这里在判断activity launchmode 是否将其他activity出栈.我们学习的 singleTask就在这里发挥了作用
if ((mLaunchFlags & FLAG_ACTIVITY_CLEAR_TOP) != 0
|| isDocumentLaunchesIntoExisting(mLaunchFlags)
|| isLaunchModeOneOf(LAUNCH_SINGLE_INSTANCE, LAUNCH_SINGLE_TASK)) {
final TaskRecord task = reusedActivity.getTaskRecord();
// In this situation we want to remove all activities from the task up to the one
// being started. In most cases this means we are resetting the task to its initial
// state.
//参照google注释,这里做了出栈动作,也就是activity顶部其他activity全部出栈
final ActivityRecord top = task.performClearTaskForReuseLocked(mStartActivity,
mLaunchFlags);
if (top != null) {
//new intent
deliverNewIntent(top);
}
}
// 这里的逻辑是在干什么,没有搞清楚
reusedActivity = setTargetStackAndMoveToFrontIfNeeded(reusedActivity);
这里巴拉巴拉一大堆我也没看明白
创建堆栈 setTaskFromReuseOrCreateNewTask
还是刚才的函数中,如果没有找reusedActivity则走以下流程,都是代码,细节很多,我也没有搞清楚,不粘贴代码了,直接上调用堆栈,细节还需要看代码掌握
2020-05-08 03:13:11.781 1029-8795/system_process D/ggpstack: java.lang.Throwable
at com.android.server.wm.ActivityStack.createTaskStack(ActivityStack.java:559)
at com.android.server.wm.ActivityStack.(ActivityStack.java:545)
at com.android.server.wm.ActivityDisplay.createStackUnchecked(ActivityDisplay.java:491)
at com.android.server.wm.ActivityDisplay.createStack(ActivityDisplay.java:481)
at com.android.server.wm.ActivityDisplay.getOrCreateStack(ActivityDisplay.java:409)
at com.android.server.wm.ActivityDisplay.getOrCreateStack(ActivityDisplay.java:427)
at com.android.server.wm.RootActivityContainer.getLaunchStack(RootActivityContainer.java:1786)
at com.android.server.wm.ActivityStarter.getLaunchStack(ActivityStarter.java:3259)
at com.android.server.wm.ActivityStarter.computeStackFocus(ActivityStarter.java:3167)
at com.android.server.wm.ActivityStarter.setTaskFromReuseOrCreateNewTask(ActivityStarter.java:2848)
at com.android.server.wm.ActivityStarter.startActivityUnchecked(ActivityStarter.java:2110)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:1782)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:1046)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:613)
at com.android.server.wm.ActivityStarter.startActivityMayWait(ActivityStarter.java:1611)
at com.android.server.wm.ActivityStarter.execute(ActivityStarter.java:544)
at com.android.server.wm.ActivityTaskManagerService.startActivityAsUser(ActivityTaskManagerService.java:1254)
at com.android.server.wm.ActivityTaskManagerService.startActivityAsUser(ActivityTaskManagerService.java:1182)
at com.android.server.wm.ActivityTaskManagerService.startActivity(ActivityTaskManagerService.java:1159)
at android.app.IActivityTaskManager$Stub.onTransact(IActivityTaskManager.java:1552)
at android.os.Binder.execTransactInternal(Binder.java:1043)
at android.os.Binder.execTransact(Binder.java:1008)
真正创建stack的地方
ActivityStack(ActivityDisplay display, int stackId, ActivityStackSupervisor supervisor,
int windowingMode, int activityType, boolean onTop) {
//一切又回到了最初,我们dumpsys activity中的信息
//设置display
mDisplayId = display.mDisplayId;
//设置type
setActivityType(activityType);
//create
createTaskStack(display.mDisplayId, onTop, mTmpRect2);
//mode pip freeform 分屏?
setWindowingMode(windowingMode, false /* animate */, false /* showRecents */,
false /* enteringSplitScreenMode */, false /* deferEnsuringVisibility */,
true /* creating */);
display.addChild(this, onTop ? POSITION_TOP : POSITION_BOTTOM);
}
void createTaskStack(int displayId, boolean onTop, Rect outBounds) {
final DisplayContent dc = mWindowManager.mRoot.getDisplayContent(displayId);
if (dc == null) {
throw new IllegalArgumentException("Trying to add stackId=" + mStackId
+ " to unknown displayId=" + displayId);
}
mTaskStack = new TaskStack(mWindowManager, mStackId, this);
dc.setStackOnDisplay(mStackId, onTop, mTaskStack);
if (mTaskStack.matchParentBounds()) {
outBounds.setEmpty();
} else {
mTaskStack.getRawBounds(outBounds);
}
}