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TaskDisplayArea、ActivityStack、Task以及ActivityRecord之间的关系

目录

一、TaskDisplayArea、ActivityStack、TaskRecord以及ActivityRecord关系图

二、TaskDisplayArea、ActivityStack、Task以及ActivityRecord相关代码

1、ActivityRecord

2、Task

3、ActivityStack

4、TaskDisplayArea

前言：对TaskDisplayArea、ActivityStack、TaskRecord以及ActivityRecord这几个类，搞应用开发的同学可能会觉得既熟悉又陌生，有接触但是对他们之间具体的关系只是一知半解，所以我这里整理了一下，方便自己回顾以及同学们的学习。以下基于Android 11讲解，不同Android版本会有差异。

一、TaskDisplayArea、ActivityStack、TaskRecord以及ActivityRecord关系图

先通过框架图直观的画出他们的关系：

我们使用dumpsys activity activities命令查看 activity 相关信息：
 

ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom): //（1）
  Stack #33: type=standard mode=fullscreen  //（2）
  isSleeping=false
  mBounds=Rect(0, 0 - 0, 0)
    mResumedActivity: ActivityRecord{42c5293 u0 com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity t33}
    * Task{abc62c9 #33 visible=true type=standard mode=fullscreen //（3）
translucent=false A=10045:com.google.android.youtube.tv.main U=0 StackId=33 sz=1}
      mBounds=Rect(0, 0 - 0, 0)
      mMinWidth=-1 mMinHeight=-1
      userId=0 effectiveUid=u0a45 mCallingUid=u0a45 mUserSetupComplete=true mCallingPackage=com.google.android.youtube.tv mCallingFeatureId=null
      affinity=10045:com.google.android.youtube.tv.main
      intent={act=android.intent.action.MAIN cat=[android.intent.category.LEANBACK_LAUNCHER] flg=0x15000000 pkg=com.google.android.youtube.tv cmp=com.google.android.yout
ube.tv/com.google.android.apps.youtube.tv.activity.MainActivity}
      mActivityComponent=com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity
      autoRemoveRecents=false isPersistable=true activityType=1
      rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
      Activities=[ActivityRecord{42c5293 u0 com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity t33}]
      askedCompatMode=false inRecents=true isAvailable=true
      mRootProcess=ProcessRecord{3b66003 2276:com.google.android.youtube.tv/u0a45}
      taskId=33 stackId=33
      mHasBeenVisible=true
      mResizeMode=RESIZE_MODE_RESIZEABLE_VIA_SDK_VERSION mSupportsPictureInPicture=false isResizeable=true
      lastActiveTime=936386 (inactive for 56s)
      * Hist #0: ActivityRecord{42c5293 u0 com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity t33}
          packageName=com.google.android.youtube.tv processName=com.google.android.youtube.tv
          launchedFromUid=10045 launchedFromPackage=com.google.android.youtube.tv launchedFromFeature=null userId=0
          app=ProcessRecord{3b66003 2276:com.google.android.youtube.tv/u0a45}
          Intent { act=android.intent.action.MAIN cat=[android.intent.category.LEANBACK_LAUNCHER] flg=0x15000000 pkg=com.google.android.youtube.tv cmp=com.google.android
.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity bnds=[1536,405][1744,554] }
          rootOfTask=true task=Task{abc62c9 #33 visible=true type=standard mode=fullscreen translucent=false A=10045:com.google.android.youtube.tv.main U=0 StackId=33 sz
=1}
          taskAffinity=10045:com.google.android.youtube.tv.main
          mActivityComponent=com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity
          baseDir=/product/app/YouTubeLeanback/YouTubeLeanback.apk
          dataDir=/data/user/0/com.google.android.youtube.tv
          stateNotNeeded=false componentSpecified=false mActivityType=standard
          compat={320dpi always-compat} labelRes=0x7f12002d icon=0x7f0f0000 theme=0x7f1300de
          mLastReportedConfigurations:
            mGlobalConfig={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 1920
, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=undefined mAlwaysOnTop=undefined mRotation=ROTATION_0
} s.6}
            mOverrideConfig={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 19
20, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATION_
0} s.2}
          CurrentConfiguration={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 -
 1920, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=standard mAlwaysOnTop=undefined mRotation=ROTATI
ON_0} s.2}
          taskDescription: label="null" icon=null iconResource=/0 iconFilename=null primaryColor=ff282828
            backgroundColor=ff303030 statusBarColor=ff000000 navigationBarColor=ff000000
          launchFailed=false launchCount=1 lastLaunchTime=-56s888ms
          mHaveState=false mIcicle=null
          state=RESUMED stopped=false delayedResume=false finishing=false
          keysPaused=false inHistory=true setToSleep=false idle=true mStartingWindowState=STARTING_WINDOW_SHOWN
          occludesParent=true noDisplay=false immersive=false launchMode=2
          frozenBeforeDestroy=false forceNewConfig=false
          mActivityType=standard
          windows=[Window{287fb2e u0 com.google.android.youtube.tv/com.google.android.apps.youtube.tv.activity.MainActivity}, Window{694a88e u0 com.google.android.youtub
e.tv/com.google.android.apps.youtube.tv.activity.MainActivity}]
          windowType=2 hasVisible=true
          mOccludesParent=true mOrientation=6
          mVisibleRequested=true mVisible=true mClientVisible=true reportedDrawn=true reportedVisible=true
          mNumInterestingWindows=2 mNumDrawnWindows=2 allDrawn=true lastAllDrawn=true)
          startingData=null firstWindowDrawn=true mIsExiting=false
          nowVisible=true lastVisibleTime=-56s184ms
          resizeMode=RESIZE_MODE_RESIZEABLE_VIA_SDK_VERSION
          mLastReportedMultiWindowMode=false mLastReportedPictureInPictureMode=false

  Stack #1: type=home mode=fullscreen                                  //（4）
  isSleeping=false
  mBounds=Rect(0, 0 - 0, 0)
    mLastPausedActivity: ActivityRecord{5965cc0 u0 com.google.android.tvlauncher/.MainActivity t30}
    * Task{3d3a13e #30 visible=false type=home mode=fullscreen         //（5）
translucent=true A=10036:.TvLauncher U=0 StackId=1 sz=1}
      mBounds=Rect(0, 0 - 0, 0)
      mMinWidth=-1 mMinHeight=-1
      userId=0 effectiveUid=u0a36 mCallingUid=0 mUserSetupComplete=true mCallingPackage=null mCallingFeatureId=null
      affinity=10036:.TvLauncher
      intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10800100 cmp=com.google.android.tvlauncher/.MainActivity}
      mActivityComponent=com.google.android.tvlauncher/.MainActivity
      autoRemoveRecents=false isPersistable=false activityType=2
      rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
      Activities=[ActivityRecord{5965cc0 u0 com.google.android.tvlauncher/.MainActivity t30}]
      askedCompatMode=false inRecents=true isAvailable=true
      taskId=30 stackId=1
      mHasBeenVisible=true
      mResizeMode=RESIZE_MODE_UNRESIZEABLE mSupportsPictureInPicture=false isResizeable=false
      lastActiveTime=931857 (inactive for 61s)
      * Hist #0: ActivityRecord{5965cc0 u0 com.google.android.tvlauncher/.MainActivity t30}
          packageName=com.google.android.tvlauncher processName=com.google.android.tvlauncher
          launchedFromUid=0 launchedFromPackage=null launchedFromFeature=null userId=0
          app=ProcessRecord{14710bd 1297:com.google.android.tvlauncher/u0a36}
          Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10800100 cmp=com.google.android.tvlauncher/.MainActivity (has extras) }       
          rootOfTask=true task=Task{3d3a13e #30 visible=false type=home mode=fullscreen translucent=true A=10036:.TvLauncher U=0 StackId=1 sz=1}
          taskAffinity=10036:.TvLauncher
          mActivityComponent=com.google.android.tvlauncher/.MainActivity
          baseDir=/product/priv-app/TVLauncher/TVLauncher.apk
          dataDir=/data/user/0/com.google.android.tvlauncher
          stateNotNeeded=true componentSpecified=false mActivityType=home
          compat={320dpi always-compat} labelRes=0x7f12002b icon=0x7f0f0000 theme=0x7f130007
          mLastReportedConfigurations:
            mGlobalConfig={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 1920
, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0} s.8
}
            mOverrideConfig={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 - 19
20, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0} s
.3}
          CurrentConfiguration={1.0 ?mcc?mnc [en_US] ldltr sw540dp w960dp h540dp 320dpi lrg long land television finger qwerty/v/v dpad/v winConfig={ mBounds=Rect(0, 0 -
 1920, 1080) mAppBounds=Rect(0, 0 - 1920, 1080) mWindowingMode=fullscreen mDisplayWindowingMode=fullscreen mActivityType=home mAlwaysOnTop=undefined mRotation=ROTATION_0
} s.4}
          RequestedOverrideConfiguration={0.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?ldr ?wideColorGamut ?orien ?uimode ?night ?touch ?ke
yb/?/? ?nav/? winConfig={ mBounds=Rect(0, 0 - 0, 0) mAppBounds=null mWindowingMode=undefined mDisplayWindowingMode=undefined mActivityType=home mAlwaysOnTop=undefined mR
otation=undefined}}
          taskDescription: label="null" icon=null iconResource=/0 iconFilename=null primaryColor=ff37474f
            backgroundColor=ff303030 statusBarColor=ff263238 navigationBarColor=ff000000
          launchFailed=false launchCount=0 lastLaunchTime=-16m8s532ms
          mHaveState=true mIcicle=Bundle[mParcelledData.dataSize=1272]
          state=STOPPED stopped=true delayedResume=false finishing=false
          keysPaused=false inHistory=true setToSleep=false idle=true mStartingWindowState=STARTING_WINDOW_REMOVED
          occludesParent=true noDisplay=false immersive=false launchMode=2
          frozenBeforeDestroy=false forceNewConfig=false
          mActivityType=home
          windows=[Window{eccb3b1 u0 com.google.android.tvlauncher/com.google.android.tvlauncher.MainActivity}]
          windowType=2 hasVisible=true
          mOccludesParent=true mOrientation=0
          mVisibleRequested=false mVisible=false mClientVisible=false reportedDrawn=false reportedVisible=false
          mAppStopped=true
          mNumInterestingWindows=1 mNumDrawnWindows=1 allDrawn=true lastAllDrawn=true)
          startingData=null firstWindowDrawn=true mIsExiting=false
          nowVisible=false lastVisibleTime=-7m58s405ms
          resizeMode=RESIZE_MODE_UNRESIZEABLE
          mLastReportedMultiWindowMode=false mLastReportedPictureInPictureMode=false

根据以上显示的信息，注释（1）中的Display #0 为ActivityDisplay，id为0，注释（2）中的Stack #33 为 ActivityStack，id为33，注释（4）中的Stack #1为ActivityStack，id为1，注释（3）和注释（5）TaskRecord的 id分别为33和30.

 关系图如下：

二、TaskDisplayArea、ActivityStack、Task以及ActivityRecord相关代码

1、ActivityRecord

\frameworks\base\services\core\java\com\android\server\wm\ActivityRecord.java


final class ActivityRecord {
    ...............
    final ActivityRecord.Token appToken;
    final ActivityTaskManagerService mAtmService;
	final ComponentName realActivity;  // the intent component, or target of an alias.
    final String shortComponentName; // the short component name of the intent
    final String packageName; // the package implementing intent's component
    final String processName; // process where this component wants to run
    final String taskAffinity; // as per ActivityInfo.taskAffinity
    boolean fullscreen; // covers the full screen?
    ...............
}

ActivityRecord记录着Activity的信息，与Activity一一对应，可能大家对ActivityRecord与Activity搞不太清楚，实际上ActivityRecord就是Activity对应的服务端，Activity为客户端。

2、Task

\frameworks\base\services\core\java\com\android\server\wm\Task.java

class Task extends WindowContainer<WindowContainer> {
................
 final ActivityTaskManagerService mAtmService;
    final ActivityStackSupervisor mStackSupervisor;
    final RootWindowContainer mRootWindowContainer;

    /* Unique identifier for this task. */
    final int mTaskId;
    /* User for which this task was created. */
    // TODO: Make final
    int mUserId;
................
}

3、ActivityStack

\frameworks\base\services\core\java\com\android\server\wm\ActivityStack.java

class ActivityStack extends Task {
}

 我们可以看到，在Android 11中ActivityStack是继承于task的，因此持有相对应Task中的mAtmService、mStackSupervisor、mRootWindowContainer、mTaskId等变量。通常开启一个新的应用，就会新建一个ActivityStack。但在同一个应用中如果通过singleInstance启动activity，那么也会新建一个ActivityStack。

4、TaskDisplayArea

\frameworks\base\services\core\java\com\android\server\wm\TaskDisplayArea.java

 final class TaskDisplayArea extends DisplayArea<ActivityStack> {
   .....................

    // Cached reference to some special tasks we tend to get a lot so we don't need to loop
    // through the list to find them.
    private ActivityStack mRootHomeTask;
    private ActivityStack mRootPinnedTask;
    private ActivityStack mRootSplitScreenPrimaryTask;

    // TODO(b/159029784): Remove when getStack() behavior is cleaned-up
    private ActivityStack mRootRecentsTask;
   .....................
}

 我们可以看到这里有很多个ActivityStack 的全局变量，mRootHomeTask使用来存储launcher的ActivityStack，其type为home。

\frameworks\base\services\core\java\com\android\server\wm\TaskDisplayArea.java

 ActivityStack getStack(int windowingMode, int activityType) {
.........
        if (activityType == ACTIVITY_TYPE_HOME) { //(6)
            return mRootHomeTask;
        } else if (activityType == ACTIVITY_TYPE_RECENTS) {
            return mRootRecentsTask;
        }
.........
}
 public static String activityTypeToString(@ActivityType int applicationType) {
        switch (applicationType) {
            case ACTIVITY_TYPE_UNDEFINED: return "undefined";
            case ACTIVITY_TYPE_STANDARD: return "standard";
            case ACTIVITY_TYPE_HOME: return "home";  //（7）
            case ACTIVITY_TYPE_RECENTS: return "recents";
            case ACTIVITY_TYPE_ASSISTANT: return "assistant";
            case ACTIVITY_TYPE_DREAM: return "dream";
        }
        return String.valueOf(applicationType);
    }

以上代码我们可以看到通过TaskDisplayArea获取ACTIVITY_TYPE_HOME的时候即返回mRootHomeTask，在注释（7）这里看到其实际type为字符“home”,那么我们回过头看看dumpsys activity activities中launcher相关信息：

 Stack #1: type=home mode=fullscreen                                  //（8）
  isSleeping=false
  mBounds=Rect(0, 0 - 0, 0)
    mLastPausedActivity: ActivityRecord{5965cc0 u0 com.google.android.tvlauncher/.MainActivity t30}
    * Task{3d3a13e #30 visible=false type=home mode=fullscreen         
translucent=true A=10036:.TvLauncher U=0 StackId=1 sz=1}
      mBounds=Rect(0, 0 - 0, 0)
      mMinWidth=-1 mMinHeight=-1
      userId=0 effectiveUid=u0a36 mCallingUid=0 mUserSetupComplete=true mCallingPackage=null mCallingFeatureId=null
      affinity=10036:.TvLauncher
      intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME]

在注释（8）中我们看到其type为home。

悦读

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