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If you are a DirecTV subscriber, grab this app and you'll have a full TV guide in your hands.
The app is basic but is good for seeing what is on and the search function helps you find that particular show.
The app lacks a remote control feature for your DirecTV system, but the next app in the list steps in for that function.
Free (DirecTV subscription required)
DirecTV Remote Pro
This app is a fully functioning remote control for your DirecTV system. It duplicates the hardware remote control, and provides all the functions of the real remote.
Never again do you have to put the Nexus 7 down to grab the TV remote.
If you listen to podcasts this app is a great way to do it on the Nexus 7. You can control your podcast subscriptions, find new podcasts, and listen to downloaded episodes.