Is it possible to add a custom property into a style in an android resource?

Question

I'm a using a view flow component into my project, which allows the dev to override some attributes, like that :

<org.taptwo.android.widget.TitleFlowIndicator
    ...
    app:footerTriangleHeight="0dip"
    ... />

I am reusing this component into several layouts, and I would like to put the properties into a style. But when I'm doing this, the parser says Error: No resource found that matches the given name: attr 'app:footerTriangleHeight', even if I add the namespace in the styles file.

Is there a way to do that in android ?

Thanks.

Selected answer is wrong/incomplete. You can style custom UI elements in the style file, done this myself... See my answer for example — Kurru, Aug 29 '11 at 13:20
please check [here](https://stackoverflow.com/questions/6860886/custom-attributes-in-styles-xml) that will address your issue. — aolphn, Jul 04 '18 at 06:33
I found the same issue on SO and that addressed my problem,[here.](https://stackoverflow.com/questions/6860886/custom-attributes-in-styles-xml) — aolphn, Jul 04 '18 at 06:35
[I found the same issue in here](https://stackoverflow.com/questions/6860886/custom-attributes-in-styles-xml) — aolphn, Jul 04 '18 at 06:36

inazaruk · Accepted Answer · 2011-08-29T13:18:38.250

Android Application

If you are not using Android Libraries, then here is what you can do:

Define custom styleable attribute (I guess you've already done that).
Do not use your namespace prefix in style items (namespace defaults to current app's namespace).

Example:

In attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <attr name="testAttr" format="string"/>        
</resources>

In styles.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>        
    <style name="TestStyle" >
      <item name="testAttr">asdf</item>
    </style>        
</resources>

Android Library

If custom attribute comes from Android Library, you can still use described approach. It theoretically should work, because Android Library's namespace is the same as application's (from aapt tool perspective during the build). But I haven't test this myself.

If you're specifying namespace, it will show error. As far as I know, styles do not support xml namespaces. So this will fail:

In styles.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:app="http://schemas.android.com/apk/res/app.package.name">        
    <style name="TestStyle" >
      <item name="app:testAttr">asdf</item>
    </style>        
</resources>

Parser automatically defaults to current app's AndroidManifest namespace, though you can not specify this namespace explicitly.

You are right, I just needed to remove the namespace in the styles file, and it worked. But it's weird that it is needed in a normal layout file, and not in a resources file. Thanks. — Matthieu Oger, Aug 29 '11 at 13:17
This works with the new CardView widget for example: just remove the namespace, and a style item like 16dp compiles and runs fine. — personne3000, Nov 21 '14 at 12:58

score 6 · Answer 2 · answered Aug 29 '11 at 13:16

6

You can define the style in terms of your namespace, i've used it myself

i.e

<style name="whatever">
    <item name="YourPackage.YourSubPackage:parametername">@drawable_or_anything/bla</item>
</style>

answered Aug 29 '11 at 13:16

Kurru

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For the text before the : use whatever namespace is defined in your manifest as your "package" – Kurru Aug 29 '11 at 13:18
1

This doesn't work for me. My custom style attribute is an enum. – David Snabel-Caunt Dec 19 '11 at 09:01
You tried to full quantify the enum as well as the attribute? – Kurru Dec 19 '11 at 17:30
Can it be used to refer to a library view's property? – Leonardo Raele Apr 09 '15 at 21:36

Is it possible to add a custom property into a style in an android resource?

2 Answers2

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