In Android ICS and JellyBean, the native Gmail app has a Back button "<" right by the Gmail icon when not in the startscreen/inbox. Is there a way I could integrate this in my app?
Yes. It's part of the ActionBar component. Take a look at the Navigating up section.
You can use Android Action bar if your target is API Level 11 and higher.
Otherwise I recommend you to use the ActionBarSherlock which is compatible to most of the devices in the market.
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