Custom Attributes in Android
If you are going to use an attr in more than one place then put it in the root element inside the <resources> element like the following :
<resources> <attr name="tag" format="string" /> <declare-styleable name="Spinner"> <attr name="tag" /> </declare-styleable> <declare-styleable name="EditText"> <attr name="tag" /> </declare-styleable></resources>Now you can use the tag attribute in anywhere you want inside this xml file .
Hope That Helps.