android - Re use gradient drawable with theme-dependent colors -

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in 2 different activities want use same gradient drawable different colors. think refer gradient colors activity theme in follow way:

i've added follow rows in attrs.xml

<attr name="backgroundtopcolor" format="color" /> <attr name="backgroundbottomcolor" format="color" />

in bg_gradient.xml typed

<shape xmlns:android="http://schemas.android.com/apk/res/android">     <gradient          android:startcolor="?backgroundtopcolor"          android:endcolor="?backgroundbottomcolor"          android:angle="270" />     <corners android:radius="0dp" /> </shape>

in activity theme, i've added

<item name="backgroundtopcolor">#ffffffff</item> <item name="backgroundbottomcolor">#ffffff00</item>

after application start in logcat

02-07 14:03:59.479: error/androidruntime(2096): caused by: java.lang.unsupportedoperationexception: can't convert color: type=0x2
02-07 14:03:59.479: error/androidruntime(2096): @ android.content.res.typedarray.getcolor(typedarray.java:326)
02-07 14:03:59.479: error/androidruntime(2096): @ android.graphics.drawable.gradientdrawable.inflate(gradientdrawable.java:647)
02-07 14:03:59.479: error/androidruntime(2096): @ android.graphics.drawable.drawable.createfromxmlinner(drawable.java:788)
02-07 14:03:59.479: error/androidruntime(2096): @ android.graphics.drawable.drawable.createfromxml(drawable.java:729)
02-07 14:03:59.479: error/androidruntime(2096): @ android.content.res.resources.loaddrawable(resources.java:1694)
02-07 14:03:59.479: error/androidruntime(2096): ... 29 more

how can solve this?

thank you

nb: api level = 8

you should use "?attr/backgroundtopcolor" instead of "?backgroundtopcolor" reference attributes.

edit: happens if indirectly reference color? instead of in theme saying:

<item name="backgroundtopcolor">#ffffffff</item>

you this:

<item name="backgroundtopcolor">@color/mycolor</item>

then in colors.xml, add:

<color name="mycolor">#ffffffff</color>

i suspect might happening attribute expecting explicit color. @ least, i've done outline, except indirectly reference color rather putting right theme.


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