In iPhone we can create a view that has a tab bar and make it the root view of the application then use the tab bar to navigate through sub views.
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Sorry, I really don't know the iPhone, but may a QuickAction Dialog help you??
http://www.londatiga.net/it/how-to-create-quickaction-dialog-in-android/
I imagine a list of some activities in that dialog.
I hope this is close to what you want.