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Show app’s activities.
Offer familiar user experience.
Key function include:◦ A dedicated space.◦ Access to important actions in a predictable way .◦ Support for navigation and view switching.
Purpose
Support Android 3.0 and Above Only
Support Android 2.1 and Above◦ 1.set up the v7 appcompat library◦ 2.◦ 3.◦ 4.
Setting Up the Action Bar