Android Question About activity title bar and AppCompat


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In my application in each activity a title bar appears.
Since I have added the Multiphotopicker library(, which requires the additional Appcompat library, the title bar has disappeared in all my activities
If in each activity I incorporate the line '#Extends line:' the title bar reappears.
Is this the right solution?.
I probably have a concept error, but:
Is it possible not to use the AppCompat library in my activities displaying the original title bar, and keep the appcompat library only for multiphotopicker requirements?