用“adb shell dumpsys activity”命令再来查看一下系统运行的的任务，就会看到：
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities) Stack #0: Task id #1 TaskRecord{42db5500 #1 A=com.google.android.googlequicksearchbox U=0 sz=1} Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10600000 cmp=com.google.android.googlequicksearchbox/com.google.android.launcher.GEL } Hist #0: ActivityRecord{42db39f8 u0 com.google.android.googlequicksearchbox/com.google.android.launcher.GEL t1} Intent { act=android.intent.action.MAIN cat=[android.intent.category.HOME] flg=0x10000000 cmp=com.google.android.googlequicksearchbox/com.google.android.launcher.GEL } ProcessRecord{42db6348 1118:com.google.android.googlequicksearchbox/u0a19} Running activities (most recent first): TaskRecord{42db5500 #1 A=com.google.android.googlequicksearchbox U=0 sz=1} Run #0: ActivityRecord{42db39f8 u0 com.google.android.googlequicksearchbox/com.google.android.launcher.GEL t1} mResumedActivity: ActivityRecord{42db39f8 u0 com.google.android.googlequicksearchbox/com.google.android.launcher.GEL t1} Stack #1: Task id #47 TaskRecord{42f32108 #47 A=com.baidu.dfc U=0 sz=1} Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.baidu.dfc/.module.mainhome.activity.HomeActivity bnds=[279,751][540,1071] } Hist #0: ActivityRecord{4310e1a0 u0 com.baidu.dfc/.module.mainhome.activity.HomeActivity t47} Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.baidu.dfc/.module.mainhome.activity.HomeActivity bnds=[279,751][540,1071] } ProcessRecord{425d5190 13633:com.baidu.dfc/u0a497} Task id #35 TaskRecord{437f1720 #35 I=com.android.settings/.applications.InstalledAppDetailsTop U=0 sz=1} Intent { act=android.settings.APPLICATION_DETAILS_SETTINGS dat=package:com.baidu.dfc flg=0x10c08000 cmp=com.android.settings/.applications.InstalledAppDetailsTop } Hist #0: ActivityRecord{42d0dfa8 u0 com.android.settings/.applications.InstalledAppDetails t35} Intent { act=android.settings.APPLICATION_DETAILS_SETTINGS dat=package:com.baidu.dfc flg=0x10c08000 cmp=com.android.settings/.applications.InstalledAppDetails } Running activities (most recent first): TaskRecord{42f32108 #47 A=com.baidu.dfc U=0 sz=1} Run #0: ActivityRecord{4310e1a0 u0 com.baidu.dfc/.module.mainhome.activity.HomeActivity t47}