Custom Attributes in Android

I'm trying to create a custom attribute called Tag for all editable elements. I added the following to attrs.xml

<declare-styleable name="Spinner">
    <attr name="tag" format="string" />开发者_运维技巧;
</declare-styleable>

<declare-styleable name="EditText">
    <attr name="tag" format="string" />
</declare-styleable>

I get an error saying "Attribute tag has already been defined" for the EditText. Is it not possible to create a custom attribute of the same name on different elements?

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.

See if my detailed answer about custom attributes helps: Defining custom attrs