On recent apps screen there is a lock/unlock button on each and every app, I want to know what's it's function. I am attaching screenshot for reference.

enter image description here

  • What version of Android is this?
    – user186920
    Commented Oct 22, 2016 at 18:12
  • It's Marshmallow.
    – dev gr
    Commented Oct 22, 2016 at 18:19
  • Interesting, because I've never seen that lock/unlock button before.
    – user186920
    Commented Oct 22, 2016 at 18:19

1 Answer 1


If you lock an app in recents and click on tap to clear, it will stay in recents. Apps not locked will be cleared (that kills all the running apps without the need to kill each one separately)

  • I thought the same, but after you answer I realized it's bit different behaviour wise. The moment you lock an app and press the clear button, it clears all the app at that moment but when next time you press the recent apps button you will find locked app there. Cheers!
    – dev gr
    Commented Oct 22, 2016 at 17:19
  • 1
    Exactly. It is to ensure that locked apps are always kept alive
    – beeshyams
    Commented Oct 22, 2016 at 17:22

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