Just subscribe to the schedule here, Iowa Hawkeyes - Schedule - College Football - Rivals.com, by selecting one of the options (most likely .ICS for Android) where it says "Add Schedule: My Y! | Alerts | iCal | .ICS" and it'll be add to your Android/Google/Outlook/etc. calendar. No need to open the Hawkeyenation app.
As long as you don't unsubscribe it will update each year and adjust when game times change.
I just searched Iowa Hawkeyes in the app store and found one called "Iowa Hawkeye Football Schedule" by Fryjr82.
It has Roster (3 different sorts), 2 deeps (as of 8/2/12), 2012-2016 schedules, divisions, 2010 and 2011 results, Hawks in NFL, rivals feed, gazette feed, hawkeye sports feed.