Android: how to add a tab bar to the existing app

I am trying to add tab bar to my existing app. I have divided all my activities into 2 groups, each group of activities has the navigation controls. I want to place 开发者_如何学编程these activities under corresponding group-1, group-2 tabs.

what is the best way of doing this.

Thanks, Venkat Papana

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Knowing nothing particular about your app its hard to say exactly how to go about doing it, but it seems like you want to implement a Tab Layout and can use the following example as a guide: http://developer.android.com/resources/tutorials/views/hello-tabwidget.html