attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name = "CameraBridgeViewBase" >
       <attr name="show_fps" format="boolean"/>
       <attr name="camera_id" format="integer" >
          <enum name="any" value="-1" />
          <enum name="back" value="99" />
          <enum name="front" value="98" />
       </attr>
    </declare-styleable>
</resources>