android - Back button clicked with empty stack but still shown in Recent apps

Question

I am trying to figure out how recent apps interacts with android back button event.

When my app is not opened in the background, if I launched an deeplink and it goes to my simply destination activity. When I clicked on back button, I can see that the activity popped from stack and my app closed due to the activity was the only one in task stack.

my questions,

• Even with back button clicked, and the app closed. I still see my app in "recent apps", my impression is that such back button should killed my app since no activity in stack at all. Why still in recent apps?

• If I click on the app in recent apps, I observed the same intent was triggered ago (deeplink intent), and why is that? (android's mechanism to cache last intent maybe?)

标签： android