How to understand the output of "adb shell dumpsys activity activities"

Issue

I implemented an automated testing tool to test my Android app. I need to frequently check the back stack of activities. So I use the following command to show it:

adb shell dumpsys activity activities | sed -En -e '/Stack #/p' -e '/Running activities/,/Run #0/p' | grep -i <package_name>/

Most of the times I see outputs like this because activity a.b opens activity c.d:

Run #1: ActivityRecord{8d12c4 u0 <package_name>/.c.d t5}
Run #0: ActivityRecord{1bb16d2 u0 <package_name>/.a.b t5}

However, sometimes I see outputs like this:

Run #1: ActivityRecord{8d12c4 u0 <package_name>/.a.b t5}
Run #0: ActivityRecord{1bb16d2 u0 <package_name>/.c.d t5 f}

The second line ends with an f}. What is the meaning of it? Does f stand for "finished"?

Solution

I find the answer. See the toString method in this class

It means finishing

Answered By - Richard Hu