A typical Android app consists of action bars and the app content area.
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Main Action Bar
The command and control center for your app. The main action bar includes elements for navigating your app’s hierarchy and views, and also surfaces the most important actions.
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View Control
Allows users to switch between the different views that your app provides. Views typically consist of different arrangements of your data or different functional aspects of your app.
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Content Area
The space where the content of your app is displayed.
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Split Action Bar
Split action bars provide a way to distribute actions across additional bars located below the main action bar or at the bottom of the screen. In this example, a split action bar moves important actions that won’t fit in the main bar to the bottom.