How to check if an activity is continuing

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http://stackoverflow.com – In my app, I am trying to run multiple photos through a photo editor (one at a time). I have it set up in a for-loop at the moment, but I feel like it is overloading the photo editor and not actually waiting until the current edit session is over, so I wanted to put a control statement in my for-loop to check if the session was still active. Is this possible? (HowTos)