Tabs in the action bar make it easy to explore and switch between different views or functional aspects of your app, or to browse categorized data sets.

Scrollable Tabs

Scrolling tab controls can contain a larger number of items than a standard tab control. To navigate to the next/previous view, swipe left or right.

Scrolling tabs in the Play Store app.
 

Fixed Tabs

Fixed tabs display all items concurrently. To navigate to a different view, touch the tab.

Tabs in Holo Dark & Light.
Tabs in the YouTube app.

Stacked Tabs

If view navigation is essential to your app, you can break out tabs into a separate action bar. This permits fast view switching even on narrower screens.