I have a main activity having intent with CATEGORY_HOME to behave like a launcher. It also has CATEGORY_LAUNCHER so that user can access from App Drawer. Here is the main activity:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
I have another activity containing a button to call the MainActivity with HOME intent. It is another entry point from App Drawer. Here is the Test Activity:
public class TestActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
findViewById(R.id.btn_test).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(TestActivity.this, MainActivity.class);
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK|Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
}
}
Here is the AndroidManifest.xml:
<application
android:allowBackup="true"
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:launchMode="singleTask"
android:clearTaskOnLaunch="true"
android:stateNotNeeded="true"
android:windowSoftInputMode="adjustPan"
android:screenOrientation="nosensor"
android:resumeWhilePausing="true"
android:taskAffinity=""
android:enabled="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".TestActivity"
android:label="Test Launcher">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
After installing, app is opened from App Drawer. Then Home button is pressed and multiple options for Launcher comes. On selection this one, again MainActivity appears. Later, by going to different launcher Test Activity is opened from App Drawer. From there, button is clicked to open the MainActivity as launcher. The issue is that even if MainActivity is singleTask, it has entry in two different stacks. Here is the logs obtained by:
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 #1352
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{90b88b8 #1352 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=1 sz=1}
userId=0 effectiveUid=u0a894 mCallingUid=u0a894 mUserSetupComplete=true mCallingPackage=com.example.binay.launcherdemo
intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.binay.launcherdemo/.MainActivity}
realActivity=com.example.binay.launcherdemo/.MainActivity
autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=0
rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{b1b0736 u0 com.example.binay.launcherdemo/.MainActivity t1352}]
askedCompatMode=false inRecents=true isAvailable=true
lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/1352_task_thumbnail.png
stackId=1
hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=true firstActiveTime=1532172058626 lastActiveTime=1532172058626 (inactive for 4s)
* Hist #0: ActivityRecord{b1b0736 u0 com.example.binay.launcherdemo/.MainActivity t1352}
packageName=com.example.binay.launcherdemo processName=com.example.binay.launcherdemo
launchedFromUid=10894 launchedFromPackage=com.example.binay.launcherdemo userId=0
app=ProcessRecord{3e17691 9030:com.example.binay.launcherdemo/u0a894}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10408000 cmp=com.example.binay.launcherdemo/.MainActivity }
frontOfTask=true task=TaskRecord{90b88b8 #1352 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=1 sz=1}
taskAffinity=null
realActivity=com.example.binay.launcherdemo/.MainActivity
baseDir=/data/app/com.example.binay.launcherdemo-1/base.apk
dataDir=/data/user/0/com.example.binay.launcherdemo
stateNotNeeded=true componentSpecified=true mActivityType=0
compat={320dpi} labelRes=0x7f0b0027 icon=0x7f0a0000 theme=0x7f0c0005
config={1.0 ?mcc?mnc [en_IN,ta_IN] ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.6}
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=ff3f51b5
launchFailed=false launchCount=1 lastLaunchTime=-4s516ms
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=2
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=APPLICATION_ACTIVITY_TYPE
waitingVisible=false nowVisible=true lastVisibleTime=-3s687ms
resizeMode=RESIZE_MODE_RESIZEABLE
Task id #1358
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{e45d9f6 #1358 A=com.example.binay.launcherdemo U=0 StackId=1 sz=1}
userId=0 effectiveUid=u0a894 mCallingUid=u0a880 mUserSetupComplete=true mCallingPackage=com.apusapps.launcher
affinity=com.example.binay.launcherdemo
intent={act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.binay.launcherdemo/.TestActivity bnds=[352,488][488,662]}
realActivity=com.example.binay.launcherdemo/.TestActivity
autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=0
rootWasReset=true mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{bcd0adc u0 com.example.binay.launcherdemo/.TestActivity t1358}]
askedCompatMode=false inRecents=true isAvailable=true
lastThumbnail=android.graphics.Bitmap@66af1f7 lastThumbnailFile=/data/system_ce/0/recent_images/1358_task_thumbnail.png
stackId=1
hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=true firstActiveTime=1532172058621 lastActiveTime=1532172058621 (inactive for 4s)
* Hist #0: ActivityRecord{bcd0adc u0 com.example.binay.launcherdemo/.TestActivity t1358}
packageName=com.example.binay.launcherdemo processName=com.example.binay.launcherdemo
launchedFromUid=10880 launchedFromPackage=com.apusapps.launcher userId=0
app=ProcessRecord{3e17691 9030:com.example.binay.launcherdemo/u0a894}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.binay.launcherdemo/.TestActivity bnds=[352,488][488,662] }
frontOfTask=true task=TaskRecord{e45d9f6 #1358 A=com.example.binay.launcherdemo U=0 StackId=1 sz=1}
taskAffinity=com.example.binay.launcherdemo
realActivity=com.example.binay.launcherdemo/.TestActivity
baseDir=/data/app/com.example.binay.launcherdemo-1/base.apk
dataDir=/data/user/0/com.example.binay.launcherdemo
stateNotNeeded=false componentSpecified=true mActivityType=0
compat={320dpi} labelRes=0x0 icon=0x7f0a0000 theme=0x7f0c0005
config={1.0 ?mcc?mnc [en_IN,ta_IN] ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.6}
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=ff3f51b5
launchFailed=false launchCount=0 lastLaunchTime=-5s605ms
haveState=true icicle=Bundle[mParcelledData.dataSize=1064]
state=STOPPED stopped=true delayedResume=false finishing=false
keysPaused=false inHistory=true visible=false 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=false lastVisibleTime=-5s221ms
resizeMode=RESIZE_MODE_RESIZEABLE
Task id #1357
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{d4c7864 #1357 A=com.apusapps.launcher U=0 StackId=1 sz=1}
userId=0 effectiveUid=u0a880 mCallingUid=u0a880 mUserSetupComplete=true mCallingPackage=com.apusapps.launcher
affinity=com.apusapps.launcher
intent={act=android.intent.action.MAIN flg=0x18000000 cmp=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity}
realActivity=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity
autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=1
rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{21fe202 u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1357}]
askedCompatMode=false inRecents=true isAvailable=true
lastThumbnail=android.graphics.Bitmap@795eacd lastThumbnailFile=/data/system_ce/0/recent_images/1357_task_thumbnail.png
stackId=1
hasBeenVisible=true mResizeMode=RESIZE_MODE_UNRESIZEABLE isResizeable=false firstActiveTime=1532172057464 lastActiveTime=1532172057464 (inactive for 5s)
* Hist #0: ActivityRecord{21fe202 u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1357}
packageName=com.apusapps.launcher processName=com.apusapps.launcher
launchedFromUid=10880 launchedFromPackage=com.apusapps.launcher userId=0
app=ProcessRecord{f590a8b 7920:com.apusapps.launcher/u0a880}
Intent { act=android.intent.action.MAIN flg=0x18000000 cmp=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity bnds=[288,1098][428,1280] (has extras) }
frontOfTask=true task=TaskRecord{d4c7864 #1357 A=com.apusapps.launcher U=0 StackId=1 sz=1}
taskAffinity=com.apusapps.launcher
realActivity=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity
baseDir=/data/app/com.apusapps.launcher-1/base.apk
dataDir=/data/user/0/com.apusapps.launcher
stateNotNeeded=false componentSpecified=true mActivityType=0
compat={320dpi} labelRes=0x7f08005f icon=0x7f0200a3 theme=0x7f1101c1
config={1.0 ?mcc?mnc [en_IN,ta_IN] ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.6}
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=ff222222
launchFailed=false launchCount=0 lastLaunchTime=-11s467ms
haveState=true icicle=Bundle[mParcelledData.dataSize=3252]
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=1
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=APPLICATION_ACTIVITY_TYPE
waitingVisible=false nowVisible=false lastVisibleTime=-10s793ms
resizeMode=RESIZE_MODE_UNRESIZEABLE
Task id #1348
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{fed9f82 #1348 A=com.apusapps.launcher U=0 StackId=1 sz=1}
userId=0 effectiveUid=u0a880 mCallingUid=u0a880 mUserSetupComplete=true mCallingPackage=com.apusapps.launcher
affinity=com.apusapps.launcher
intent={act=android.intent.action.MAIN flg=0x18000000 cmp=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity}
realActivity=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity
autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=0 mTaskToReturnTo=1
rootWasReset=false mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{5f4526d u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1348}]
askedCompatMode=false inRecents=false isAvailable=true
lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/1348_task_thumbnail.png
stackId=1
hasBeenVisible=true mResizeMode=RESIZE_MODE_UNRESIZEABLE isResizeable=false firstActiveTime=1532172010058 lastActiveTime=1532172010058 (inactive for 53s)
* Hist #0: ActivityRecord{5f4526d u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1348}
packageName=com.apusapps.launcher processName=com.apusapps.launcher
launchedFromUid=10880 launchedFromPackage=com.apusapps.launcher userId=0
app=ProcessRecord{f590a8b 7920:com.apusapps.launcher/u0a880}
Intent { act=android.intent.action.MAIN flg=0x18000000 cmp=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity bnds=[288,1098][428,1280] (has extras) }
frontOfTask=true task=TaskRecord{fed9f82 #1348 A=com.apusapps.launcher U=0 StackId=1 sz=1}
taskAffinity=com.apusapps.launcher
realActivity=com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity
baseDir=/data/app/com.apusapps.launcher-1/base.apk
dataDir=/data/user/0/com.apusapps.launcher
stateNotNeeded=false componentSpecified=true mActivityType=0
compat={320dpi} labelRes=0x7f08005f icon=0x7f0200a3 theme=0x7f1101c1
config={1.0 ?mcc?mnc [en_IN,ta_IN] ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.6}
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=ff222222
launchFailed=false launchCount=0 lastLaunchTime=-2m24s974ms
haveState=true icicle=Bundle[mParcelledData.dataSize=3252]
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=1
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=APPLICATION_ACTIVITY_TYPE
waitingVisible=false nowVisible=false lastVisibleTime=-1m52s149ms
resizeMode=RESIZE_MODE_UNRESIZEABLE
Running activities (most recent first):
TaskRecord{90b88b8 #1352 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=1 sz=1}
Run #5: ActivityRecord{b1b0736 u0 com.example.binay.launcherdemo/.MainActivity t1352}
TaskRecord{e45d9f6 #1358 A=com.example.binay.launcherdemo U=0 StackId=1 sz=1}
Run #4: ActivityRecord{bcd0adc u0 com.example.binay.launcherdemo/.TestActivity t1358}
TaskRecord{d4c7864 #1357 A=com.apusapps.launcher U=0 StackId=1 sz=1}
Run #3: ActivityRecord{21fe202 u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1357}
TaskRecord{fed9f82 #1348 A=com.apusapps.launcher U=0 StackId=1 sz=1}
Run #2: ActivityRecord{5f4526d u0 com.apusapps.launcher/com.apusapps.allapps.AllAppsActivity t1348}
TaskRecord{14ab4fc #1329 A=com.android.settings U=0 StackId=1 sz=2}
Run #1: ActivityRecord{34e44db u0 com.android.settings/.SubSettings t1329}
Run #0: ActivityRecord{8cc3587 u0 com.android.settings/.Settings t1329}
mResumedActivity: ActivityRecord{b1b0736 u0 com.example.binay.launcherdemo/.MainActivity t1352}
mLastPausedActivity: ActivityRecord{bcd0adc u0 com.example.binay.launcherdemo/.TestActivity t1358}
Stack #0:
mFullscreen=true
mBounds=null
Task id #1354
mFullscreen=true
mBounds=null
mMinWidth=-1
mMinHeight=-1
mLastNonFullscreenBounds=null
* TaskRecord{28ab6d0 #1354 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=0 sz=1}
userId=0 effectiveUid=u0a894 mCallingUid=1000 mUserSetupComplete=true mCallingPackage=android
intent={act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x13200000 cmp=com.example.binay.launcherdemo/.MainActivity}
realActivity=com.example.binay.launcherdemo/.MainActivity
autoRemoveRecents=false isPersistable=true numFullscreen=1 taskType=1 mTaskToReturnTo=0
rootWasReset=true mNeverRelinquishIdentity=true mReuseTask=false mLockTaskAuth=LOCK_TASK_AUTH_PINNABLE
Activities=[ActivityRecord{63afa71 u0 com.example.binay.launcherdemo/.MainActivity t1354}]
askedCompatMode=false inRecents=true isAvailable=true
lastThumbnail=null lastThumbnailFile=/data/system_ce/0/recent_images/1354_task_thumbnail.png
stackId=0
hasBeenVisible=true mResizeMode=RESIZE_MODE_RESIZEABLE isResizeable=false firstActiveTime=1532172047076 lastActiveTime=1532172047076 (inactive for 16s)
* Hist #0: ActivityRecord{63afa71 u0 com.example.binay.launcherdemo/.MainActivity t1354}
packageName=com.example.binay.launcherdemo processName=com.example.binay.launcherdemo
launchedFromUid=1000 launchedFromPackage=android userId=0
app=ProcessRecord{3e17691 9030:com.example.binay.launcherdemo/u0a894}
Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x13200000 cmp=com.example.binay.launcherdemo/.MainActivity (has extras) }
frontOfTask=true task=TaskRecord{28ab6d0 #1354 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=0 sz=1}
taskAffinity=null
realActivity=com.example.binay.launcherdemo/.MainActivity
baseDir=/data/app/com.example.binay.launcherdemo-1/base.apk
dataDir=/data/user/0/com.example.binay.launcherdemo
stateNotNeeded=true componentSpecified=true mActivityType=1
compat={320dpi} labelRes=0x7f0b0027 icon=0x7f0a0000 theme=0x7f0c0005
config={1.0 ?mcc?mnc [en_IN,ta_IN] ldltr sw360dp w360dp h616dp 320dpi nrml long port finger -keyb/v/h -nav/h s.6}
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=ff3f51b5
launchFailed=false launchCount=0 lastLaunchTime=-25s581ms
haveState=true icicle=Bundle[mParcelledData.dataSize=988]
state=STOPPED stopped=true delayedResume=false finishing=false
keysPaused=false inHistory=true visible=false sleeping=false idle=true mStartingWindowState=STARTING_WINDOW_SHOWN
fullscreen=true noDisplay=false immersive=false launchMode=2
frozenBeforeDestroy=false forceNewConfig=false
mActivityType=HOME_ACTIVITY_TYPE
waitingVisible=false nowVisible=false lastVisibleTime=-24s580ms
resizeMode=RESIZE_MODE_RESIZEABLE
Running activities (most recent first):
TaskRecord{f52b693 #1347 A=com.apusapps.launcher U=0 StackId=0 sz=1}
Run #2: ActivityRecord{ea77784 u0 com.apusapps.launcher/.launcher.ApusLauncherActivity t1347}
TaskRecord{28ab6d0 #1354 I=com.example.binay.launcherdemo/.MainActivity U=0 StackId=0 sz=1}
Run #1: ActivityRecord{63afa71 u0 com.example.binay.launcherdemo/.MainActivity t1354}
TaskRecord{2f08c58 #1344 A=com.teslacoilsw.launcher.NovaLauncher U=0 StackId=0 sz=1}
Run #0: ActivityRecord{bedac0b u0 com.teslacoilsw.launcher/.NovaLauncher t1344}
mLastPausedActivity: ActivityRecord{ea77784 u0 com.apusapps.launcher/.launcher.ApusLauncherActivity t1347}
mFocusedActivity: ActivityRecord{b1b0736 u0 com.example.binay.launcherdemo/.MainActivity t1352}
mFocusedStack=ActivityStack{bd7e9da stackId=1, 6 tasks} mLastFocusedStack=ActivityStack{bd7e9da stackId=1, 6 tasks}
mSleepTimeout=false
mCurTaskIdForUser={0=1358}
mUserStackInFront={}
mActivityContainers={0=ActivtyContainer{0}A, 1=ActivtyContainer{1}A}
mLockTaskModeState=NONE mLockTaskPackages (userId:packages)=
0:[]
10:[]
11:[]
mLockTaskModeTasks[]
Two entries of MainActivity is there in the logs. One with stackId=0 and another with stackId=1. So, why two instances are created even if the activity is singleTask?
来源：https://stackoverflow.com/questions/51455763/adb-shell-dumpsys-activity-activities-shows-two-instances-of-single-task-in-sepa