借鉴：https://blog.csdn.net/wangjicong_215/article/details/79744599
8.1之前
window 通过adb shell dumpsys activity | findstr “mFocus”
Linux 通过adb shell dumpsys activity | grep “mFocus”
8.1之后
window 通过adb shell dumpsys activity | findstr “mResume”
Linux 通过adb shell dumpsys activity | grep “mResume”