You need to define an attribute for your value:
<attr name="myColor" format="color" />
Then make a custom theme that supplies a value for it:
<style name="MyTheme" parent="android:Theme">
<item name="com.my.package:myColor">#ff808080</item>
</style>
And now you can reference that value from other XML:
<shape xmlns:android="http://schemas.android.com/apk/res/android";
android:shape="rectangle">
<gradient android:startColor="?com.my.package:myColor"
android:endColor="#66FFFFFF"
android:angle="270" />
</shape>
Note that "com.my.package" is your manifest's package name.
Also I just wrote this by hand so I won't guarantee it is completely right.
:}
On Mon, May 10, 2010 at 11:02 AM, Mariano Kamp <mariano.k...@gmail.com>wrote:
> Hmmh, also no answer to this question on themes. Maybe the answer cannot be
> given with two lines? So let me explain what I would expect step by step and
> you stop me were I deviate from the Golden Path? I'll try yes/no questions.
>
> In the simplest terms I would expect that in every place I can specify a
> color in RGB (#ffff) I could also specify a symbolic name instead. This
> should work like @color/xyz, but with one more level of indirection that
> lets me switch between themes, like dark and light.
>
> Is that possible?
>
> I would expect those themes to be applicable to (a) widgets, (b) drawables
> (see the mentioned example) and (c) when I need to style something myself
> like HTML. Are (a) - (c) possible?
>
> Furthermore I would expect that I could define style keys myself, but I got
> the impression that only keys from the "android" namespace can be used? That
> lead me to believe that you can't define abstract colors, but only styles
> for specific attributes used in the widgets' implementations.
>
> And again, if there is any meaningful documentation I would be happy to
> read it. Just send me the link or name of the book.
>
>
> On Sat, May 8, 2010 at 3:26 PM, Mariano Kamp <mariano.k...@gmail.com>wrote:
>
>> Hi,
>>
>> I have trouble
>> (example<http://groups.google.com/group/android-developers/browse_thread/thread/5b4ce3e49a1b63d2/>)
>> wrapping my head around styles/themes. Can somebody help me or point me to
>> actual documentation?
>>
>> Let's say I have a drawable that I want to use as the background of a
>> layout:
>>
>> <shape xmlns:android="http://schemas.android.com/apk/res/android";
>> android:shape="rectangle">
>> <gradient android:startColor="#9F9FA4" android:endColor="#66FFFFFF"
>> android:angle="270" />
>> </shape>
>>
>>
>> Now I want to have a dark and a light theme. Depending on the chosen theme I
>> want to have a different value for startColor and endColor. How do I do
>> that? I am aware of extending themes, but what do I put into the items? How
>> do I reference those new values then?
>>
>>
>> Cheers,
>>
>> Mariano
>>
>>
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Android framework engineer
hack...@android.com
Note: please don't send private questions to me, as I don't have time to
provide private support, and so won't reply to such e-mails. All such
questions should be posted on public forums, where I and others can see and
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