如果应用程序位于前台，则通知ParentStack重新启动父级

Question

首先，我需要通知我在互联网上搜索没有成功......

我的问题很简单。我的应用程序可以随时显示推送通知（应该打开Event.class）。但是，当显示通知时，应用程序可能位于前台或后台。

根据Google的建议，我有以下代码

Intent resultIntent = new Intent(this, Event.class);
resultIntent.setFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
                        TaskStackBuilder stackBuilder = TaskStackBuilder.create(getApplicationContext());
                        stackBuilder.addParentStack(Event.class);
                        stackBuilder.addNextIntent(resultIntent);
                        PendingIntent contentIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

这是我的清单：

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme" >
    <activity android:name=".MainActivity" android:screenOrientation="portrait" android:theme="@style/SplashTheme">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".Event" android:screenOrientation="portrait"></activity>
    <activity android:name=".HomeContainer" android:windowSoftInputMode="adjustPan"  android:screenOrientation="portrait"></activity>

</application>

当应用在后台时

当我打开通知时，会创建Event.class。当我点击back_button时，会创建MainActivity.class。这是正常的，这就是我想要的。

当应用处于前台时

我正在 MainActivity.class 编辑 HomeContainer.class。然后我打开通知，这样就创建了Event.class。当我单击back_button时，将重新创建MainActivity.class。我不想要那个。在这种情况下，只想resume() MainActivity.class 编辑 Homecontainer.class。

我该怎么办？我搜索了Android文档中的不同INTENT_FLAGS，但似乎没有任何改编。

提前致谢。

根据David Wasser的要求， 结果：adb shell dumpsys activity activities

ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #1:
mFullscreen=true
mBounds=null
Task id #3259
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{1d5ebe7 #3259 A=me.APPNAME.app U=0 StackId=1 sz=1}
  userId=0 effectiveUid=u0a132 mCallingUid=u0a132 mUserSetupComplete=true mCallingPackage=me.APPNAME.app
  affinity=me.APPNAME.app
  intent={flg=0x18000000 cmp=me.APPNAME.app/.Event}
  realActivity=me.APPNAME.app/.Event
  autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=0
  rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
  Activities=[ActivityRecord{d8edb34 u0 me.APPNAME.app/.Event t3259}]
  askedCompatMode=false inRecents=true isAvailable=true
  lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/3259_task_thumbnail.png
  stackId=1
  hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=true firstActiveTime=1519781736501 lastActiveTime=1519781736501 (inactive for 5s)
  * Hist #0: ActivityRecord{d8edb34 u0 me.APPNAME.app/.Event t3259}
      packageName=me.APPNAME.app processName=me.APPNAME.app
      launchedFromUid=10132 launchedFromPackage=me.APPNAME.app userId=0
      app=ProcessRecord{1e57f14 19075:me.APPNAME.app/u0a132}
      Intent { flg=0x18000000 cmp=me.APPNAME.app/.Event (has extras) }
      frontOfTask=true task=TaskRecord{1d5ebe7 #3259 A=me.APPNAME.app U=0 StackId=1 sz=1}
      taskAffinity=me.APPNAME.app
      realActivity=me.APPNAME.app/.Event
      baseDir=/data/app/me.APPNAME.app-1/base.apk
      dataDir=/data/user/0/me.APPNAME.app
      splitDir=[/data/app/me.APPNAME.app-1/split_lib_directories_apk.apk]
      stateNotNeeded=false componentSpecified=true mActivityType=0
      compat={384dpi} labelRes=0x7f100029 icon=0x7f0d0000 theme=0x7f110006
      config={1.0 208mcc15mnc [fr_FR] ldltr sw449dp w449dp h775dp 384dpi nrml long port finger -keyb/v/h -nav/h s.11}
      taskConfigOverride={1.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
      taskDescription: iconFilename=null label="null" color=ff1976d2
      launchFailed=false launchCount=1 lastLaunchTime=-5s734ms
      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_SHOWN
      fullscreen=true noDisplay=false immersive=false launchMode=0
      frozenBeforeDestroy=false forceNewConfig=false
      mActivityType=APPLICATION_ACTIVITY_TYPE
      waitingVisible=false nowVisible=true lastVisibleTime=-5s9ms
      resizeMode=RESIZE_MODE_RESIZEABLE
Task id #3258
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{1a00394 #3258 A=me.APPNAME.app U=0 StackId=1 sz=1}
  userId=0 effectiveUid=u0a132 mCallingUid=u0a132 mUserSetupComplete=true mCallingPackage=me.APPNAME.app
  affinity=me.APPNAME.app
  intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=me.APPNAME.app/.MainActivity}
  realActivity=me.APPNAME.app/.MainActivity
  autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=1
  rootWasReset=true mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
  Activities=[ActivityRecord{e5f96d1 u0 me.APPNAME.app/.HomeContainer t3258}]
  askedCompatMode=false inRecents=false isAvailable=true
  lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/3258_task_thumbnail.png
  stackId=1
  hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=true firstActiveTime=1519781736451 lastActiveTime=1519781736451 (inactive for 5s)
  * Hist #0: ActivityRecord{e5f96d1 u0 me.APPNAME.app/.HomeContainer t3258}
      packageName=me.APPNAME.app processName=me.APPNAME.app
      launchedFromUid=10132 launchedFromPackage=me.APPNAME.app userId=0
      app=ProcessRecord{1e57f14 19075:me.APPNAME.app/u0a132}
      Intent { flg=0x10000 cmp=me.APPNAME.app/.HomeContainer }
      frontOfTask=true task=TaskRecord{1a00394 #3258 A=me.APPNAME.app U=0 StackId=1 sz=1}
      taskAffinity=me.APPNAME.app
      realActivity=me.APPNAME.app/.HomeContainer
      baseDir=/data/app/me.APPNAME.app-1/base.apk
      dataDir=/data/user/0/me.APPNAME.app
      splitDir=[/data/app/me.APPNAME.app-1/split_lib_directories_apk.apk]
      stateNotNeeded=false componentSpecified=true mActivityType=0
      compat={384dpi} labelRes=0x7f100029 icon=0x7f0d0000 theme=0x7f110006
      config={1.0 208mcc15mnc [fr_FR] ldltr sw449dp w449dp h775dp 384dpi nrml long port finger -keyb/v/h -nav/h s.11}
      taskConfigOverride={1.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
      taskDescription: iconFilename=null label="null" color=ff1976d2
      launchFailed=false launchCount=0 lastLaunchTime=-35s758ms
      haveState=true icicle=Bundle[mParcelledData.dataSize=14188]
      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=0
      frozenBeforeDestroy=false forceNewConfig=false
      mActivityType=APPLICATION_ACTIVITY_TYPE
      waitingVisible=false nowVisible=false lastVisibleTime=-33s336ms
      resizeMode=RESIZE_MODE_RESIZEABLE
Task id #3185
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{ec402a4 #3185 I=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity U=0 StackId=1 sz=1}
  userId=0 effectiveUid=u0a43 mCallingUid=u0a43 mUserSetupComplete=true mCallingPackage=com.google.android.googlequicksearchbox
  intent={flg=0x10808000 cmp=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity}
  realActivity=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity
  autoRemoveRecents=false isPersistable=false numFullscreen=1 taskType=0 mTaskToReturnTo=1
  rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
  Activities=[ActivityRecord{6387e63 u0 com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity t3185}]
  askedCompatMode=false inRecents=true isAvailable=true
  lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/3185_task_thumbnail.png
  stackId=1
  hasBeenVisible=true mResizeMode=RESIZE_MODE_UNRESIZEABLE isResizeable=false firstActiveTime=1519761319987 lastActiveTime=1519761319987 (inactive for 20422s)
  * Hist #0: ActivityRecord{6387e63 u0 com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity t3185}
      packageName=com.google.android.googlequicksearchbox processName=com.google.android.googlequicksearchbox:search
      launchedFromUid=10043 launchedFromPackage=com.google.android.googlequicksearchbox userId=0
      app=ProcessRecord{54c0ce7 16531:com.google.android.googlequicksearchbox:search/u0a43}
      Intent { flg=0x10808000 cmp=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity (has extras) }
      frontOfTask=true task=TaskRecord{ec402a4 #3185 I=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity U=0 StackId=1 sz=1}
      taskAffinity=null
      realActivity=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity
      baseDir=/data/app/com.google.android.googlequicksearchbox-1/base.apk
      dataDir=/data/user/0/com.google.android.googlequicksearchbox
      stateNotNeeded=false componentSpecified=true mActivityType=0
      compat={384dpi} labelRes=0x7f140c2b icon=0x7f02047c theme=0x7f1501ec
      config={1.0 208mcc15mnc [fr_FR] ldltr sw449dp w449dp h775dp 384dpi nrml long port finger -keyb/v/h -nav/h s.11}
      taskConfigOverride={1.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
      taskDescription: iconFilename=null label="null" color=ff4285f4
      launchFailed=false launchCount=0 lastLaunchTime=-5h31m17s606ms
      haveState=true icicle=Bundle[mParcelledData.dataSize=5644]
      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=APPLICATION_ACTIVITY_TYPE
      waitingVisible=false nowVisible=false lastVisibleTime=-5h9m27s823ms
      resizeMode=RESIZE_MODE_UNRESIZEABLE

Running activities (most recent first):
  TaskRecord{1d5ebe7 #3259 A=me.APPNAME.app U=0 StackId=1 sz=1}
    Run #2: ActivityRecord{d8edb34 u0 me.APPNAME.app/.Event t3259}
  TaskRecord{1a00394 #3258 A=me.APPNAME.app U=0 StackId=1 sz=1}
    Run #1: ActivityRecord{e5f96d1 u0 me.APPNAME.app/.HomeContainer t3258}
  TaskRecord{ec402a4 #3185 I=com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity U=0 StackId=1 sz=1}
    Run #0: ActivityRecord{6387e63 u0 com.google.android.googlequicksearchbox/com.google.android.apps.gsa.staticplugins.opa.OpaActivity t3185}

  mResumedActivity: ActivityRecord{d8edb34 u0 me.APPNAME.app/.Event t3259}
  mLastPausedActivity: ActivityRecord{e5f96d1 u0 me.APPNAME.app/.HomeContainer t3258}

Stack #0:
mFullscreen=true
mBounds=null
Task id #2488
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{f9fd3c2 #2488 I=com.google.android.apps.nexuslauncher/.NexusLauncherActivity U=0 StackId=0 sz=1}
  userId=0 effectiveUid=u0a83 mCallingUid=u0a29 mUserSetupComplete=true mCallingPackage=com.android.systemui
  intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000100 cmp=com.google.android.apps.nexuslauncher/.NexusLauncherActivity}
  realActivity=com.google.android.apps.nexuslauncher/.NexusLauncherActivity
  autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=1 mTaskToReturnTo=1
  rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
  Activities=[ActivityRecord{871cda8 u0 com.google.android.apps.nexuslauncher/.NexusLauncherActivity t2488}]
  askedCompatMode=false inRecents=true isAvailable=true
  lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/2488_task_thumbnail.png
  stackId=0
  hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=false firstActiveTime=1519781704569 lastActiveTime=1519781704569 (inactive for 37s)
  * Hist #0: ActivityRecord{871cda8 u0 com.google.android.apps.nexuslauncher/.NexusLauncherActivity t2488}
      packageName=com.google.android.apps.nexuslauncher processName=com.google.android.apps.nexuslauncher
      launchedFromUid=0 launchedFromPackage=null userId=0
      app=ProcessRecord{275537b 13195:com.google.android.apps.nexuslauncher/u0a83}
      Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000100 cmp=com.google.android.apps.nexuslauncher/.NexusLauncherActivity }
      frontOfTask=true task=TaskRecord{f9fd3c2 #2488 I=com.google.android.apps.nexuslauncher/.NexusLauncherActivity U=0 StackId=0 sz=1}
      taskAffinity=null
      realActivity=com.google.android.apps.nexuslauncher/.NexusLauncherActivity
      baseDir=/data/app/com.google.android.apps.nexuslauncher-1/base.apk
      dataDir=/data/user/0/com.google.android.apps.nexuslauncher
      stateNotNeeded=true componentSpecified=false mActivityType=1
      compat={384dpi} labelRes=0x7f0c008c icon=0x7f02002b theme=0x7f120002
      config={1.0 208mcc15mnc [fr_FR] ldltr sw449dp w449dp h775dp 384dpi nrml long port finger -keyb/v/h -nav/h s.11}
      taskConfigOverride={1.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
      taskDescription: iconFilename=null label="null" color=fff5f5f5
      launchFailed=false launchCount=0 lastLaunchTime=-3d3h30m22s60ms
      haveState=true icicle=Bundle[mParcelledData.dataSize=5208]
      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=HOME_ACTIVITY_TYPE
      waitingVisible=false nowVisible=false lastVisibleTime=-38s713ms
      connections=[]
      resizeMode=RESIZE_MODE_RESIZEABLE

Task id #2490
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{39e75d3 #2490 A=com.android.systemui U=0 StackId=0 sz=1}
  userId=0 effectiveUid=u0a29 mCallingUid=u0a29 mUserSetupComplete=true mCallingPackage=com.android.systemui
  affinity=com.android.systemui
  intent={flg=0x10804000 cmp=com.android.systemui/.recents.RecentsActivity bnds=[38,1727][1042,3206]}
  realActivity=com.android.systemui/.recents.RecentsActivity
  autoRemoveRecents=false isPersistable=false numFullscreen=1 taskType=2 mTaskToReturnTo=1
  rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
  Activities=[ActivityRecord{52e27f8 u0 com.android.systemui/.recents.RecentsActivity t2490}]
  askedCompatMode=false inRecents=true isAvailable=true
  lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/2490_task_thumbnail.png
  stackId=0
  hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=true firstActiveTime=1519781703116 lastActiveTime=1519781703116 (inactive for 39s)
  * Hist #0: ActivityRecord{52e27f8 u0 com.android.systemui/.recents.RecentsActivity t2490}
      packageName=com.android.systemui processName=com.android.systemui
      launchedFromUid=10029 launchedFromPackage=com.android.systemui userId=0
      app=ProcessRecord{cd948d2 12010:com.android.systemui/u0a29}
      Intent { flg=0x10804000 cmp=com.android.systemui/.recents.RecentsActivity bnds=[38,1727][1042,3206] }
      frontOfTask=true task=TaskRecord{39e75d3 #2490 A=com.android.systemui U=0 StackId=0 sz=1}
      taskAffinity=com.android.systemui
      realActivity=com.android.systemui/.recents.RecentsActivity
      baseDir=/system/priv-app/SystemUI/SystemUI.apk
      dataDir=/data/user_de/0/com.android.systemui
      stateNotNeeded=true componentSpecified=true mActivityType=2
      compat={384dpi} labelRes=0x7f0d02b9 icon=0x7f020175 theme=0x7f1301ea
      config={1.0 208mcc15mnc [fr_FR] ldltr sw449dp w449dp h775dp 384dpi nrml long port finger -keyb/v/h -nav/h s.7}
      taskConfigOverride={1.0 ?mcc?mnc ?localeList ?layoutDir ?swdp ?wdp ?hdp ?density ?lsize ?long ?orien ?uimode ?night ?touch ?keyb/?/? ?nav/?}
      taskDescription: iconFilename=null label="null" color=ff212121
      launchFailed=false launchCount=0 lastLaunchTime=-3d3h11m55s774ms
      haveState=true icicle=Bundle[mParcelledData.dataSize=500]
      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=3
      frozenBeforeDestroy=false forceNewConfig=false
      mActivityType=RECENTS_ACTIVITY_TYPE
      waitingVisible=false nowVisible=false lastVisibleTime=-41s902ms
      resizeMode=RESIZE_MODE_RESIZEABLE

Running activities (most recent first):
  TaskRecord{f9fd3c2 #2488 I=com.google.android.apps.nexuslauncher/.NexusLauncherActivity U=0 StackId=0 sz=1}
    Run #1: ActivityRecord{871cda8 u0 com.google.android.apps.nexuslauncher/.NexusLauncherActivity t2488}
  TaskRecord{39e75d3 #2490 A=com.android.systemui U=0 StackId=0 sz=1}
    Run #0: ActivityRecord{52e27f8 u0 com.android.systemui/.recents.RecentsActivity t2490}

mLastPausedActivity: ActivityRecord{871cda8 u0 com.google.android.apps.nexuslauncher/.NexusLauncherActivity t2488}

mFocusedActivity: ActivityRecord{d8edb34 u0 me.APPNAME.app/.Event t3259}
mFocusedStack=ActivityStack{690a510 stackId=1, 10 tasks} 
mLastFocusedStack=ActivityStack{690a510 stackId=1, 10 tasks}
mSleepTimeout=false
mCurTaskIdForUser={0=3259}
mUserStackInFront={}
mActivityContainers={0=ActivtyContainer{0}A, 1=ActivtyContainer{1}A}
mLockTaskModeState=NONE mLockTaskPackages (userId:packages)=
0:[]
mLockTaskModeTasks[]

我尝试过的更新代码（遵循David Wasser的建议）：

Intent resultIntent = new Intent(this, Event.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);
/** remove uninteresting lines */
NotificationCompat.Builder notificationBuilder = new 
NotificationCompat.Builder(getApplicationContext(), channel_id);
notificationBuilder.setContentIntent(contentIntent); 
/** other parameters as title, icons etc */
notificationManager.notify(_id, notificationBuilder.build());