android-activity之默认启动模式和FLAG_ACTIVITY_NEW_TASK

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原创最新推荐文章于 2026-03-01 00:34:05 发布 966 阅读 AI 写同款· GEO 优化 ›

Activity的四种启动模式 Activity的启动模式可在项目的配置文件内进行设置 standard：标准模式下每次启动的Activity都会新建，切放到Task任务栈的栈顶，通过点击返回关闭应用的话，就需要返回Activity的新建次数 singleTop：相较于standard模式，singleTop模式下，当新建Activity时，首先会确定该Activity是否在该Task的顶部。如果不在的话才会新建 singleTask: 相较于singleTop模式，singleTask模式下，新建Activity时首先会判断其是否阅读详情

测试应用主activityA使用默认启动模式
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}

Stack #0:

打开activityB，添加flag----FLAG_ACTIVITY_NEW_TASK
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #28
    * TaskRecord{a1743d1 #28 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{2ef42f8 u0 com.wp.launchmode/.ActivityB t28}
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}

Stack #0:

打开activityC
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #28
    * TaskRecord{a1743d1 #28 A=com.wp.launchmode U=0 sz=2}
      * Hist #1: ActivityRecord{1aa9a57 u0 com.wp.launchmode/.ActivityC t28}
      * Hist #0: ActivityRecord{2ef42f8 u0 com.wp.launchmode/.ActivityB t28}
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}

Stack #0:

打开activityD
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #28
    * TaskRecord{a1743d1 #28 A=com.wp.launchmode U=0 sz=3}
      * Hist #2: ActivityRecord{8581614 u0 com.wp.launchmode/.ActivityD t28}
      * Hist #1: ActivityRecord{1aa9a57 u0 com.wp.launchmode/.ActivityC t28}
      * Hist #0: ActivityRecord{2ef42f8 u0 com.wp.launchmode/.ActivityB t28}
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}

Stack #0:

打开activityA
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}
    Task id #28
    * TaskRecord{a1743d1 #28 A=com.wp.launchmode U=0 sz=3}
      * Hist #2: ActivityRecord{8581614 u0 com.wp.launchmode/.ActivityD t28}
      * Hist #1: ActivityRecord{1aa9a57 u0 com.wp.launchmode/.ActivityC t28}
      * Hist #0: ActivityRecord{2ef42f8 u0 com.wp.launchmode/.ActivityB t28}

Stack #0:

打开activityB，C，D
ACTIVITY MANAGER ACTIVITIES (dumpsys activity activities)
Display #0 (activities from top to bottom):
Stack #5:
    Task id #28
    * TaskRecord{a1743d1 #28 A=com.wp.launchmode U=0 sz=3}
      * Hist #2: ActivityRecord{8581614 u0 com.wp.launchmode/.ActivityD t28}
      * Hist #1: ActivityRecord{1aa9a57 u0 com.wp.launchmode/.ActivityC t28}
      * Hist #0: ActivityRecord{2ef42f8 u0 com.wp.launchmode/.ActivityB t28}
    Task id #27
    * TaskRecord{4f29769 #27 A=com.wp.launchmode U=0 sz=1}
      * Hist #0: ActivityRecord{a0bc5f0 u0 com.wp.launchmode/.ActivityA t27}

Stack #0:

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