I am in the process of adapting a large application to taking advantage of Android 3.x features and introducing tablet type look and feel. One thing I am unclear about is what the usage recommendation would be for using pop-up dialogs vs in page sections.
Specifically e.g. looking at the Settings screen for the Google Reader app on my Xoom this is done as a pop up dialog:
On the other hand the Gmail client uses a two pane display as normal in screen display and not hovering over the rest:
This seems to be more common (e.g. others using it are Android Market, Amazon Kindle, Youtube). But then others like Google Current uses the pop up style.
I personally prefer the in page, non pop up style, but thought I would ask about recommendations on how to decide between the two. E.g. I also have a multi page wizard process that would be suitable as a pop (an order process) over the affected data but I am uncertain how to choose or if to use those dialogs for anything beyond e.g. simple chooser or login dialog.
To complicate matters the iOS version seems to use lots of dialogs and I personally dont like it too much, but I am also not aware of UI design recommendations for iOS on that side.
So what would you recommend?
Update: There is now an official style guide that reflects Romains answer as far as I am concerned.