How to reference colour attribute in drawable? [duplicate]

Answer 1

You're trying to convert an attribute into a color. Attributes are properties usually attached to a view, which can then be styled using a theme.

You need to reference a color resource in your xml. You can do so by creating your own resource :

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPressedHighlight">#FF8800</color>
</resources>

Then reference it like this :

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_selected="true">
        <color android:color="@color/colorPressedHighlight"/>
    </item>
    <item android:state_selected="false">
        <color android:color="@color/section_list_background"/>
    </item>    
</selector>

Or you can reference a color available in the Android resources :

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_selected="true">
        <color android:color="@android:color/holo_orange_light"/>
    </item>
    <item android:state_selected="false">
        <color android:color="@android:color/holo_blue_dark"/>
    </item>
</selector>

Answer 2

You might need to do the following to fix your problem:

1) Define 2 colors for each theme in your colors file:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="my_color_dark">#ff33B5E5</color>
    <color name="my_color_light">#ff355689</color>
</resources>

2) Create file res/values/attrs.xml with contents:

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

3) Assuming you have 2 themes in your styles.xml (Theme.dark and Theme.light) define:

<style name="Theme.dark" parent="@style/Theme.Sherlock">
    <item name="my_color">@color/my_color_dark</item>
</style>

<style name="Theme.light" parent="@style/Theme.Sherlock.Light">
    <item name="my_color">@color/my_color_light</item>
</style>

4) Use the color in a drawable:

<color android:color="?attr/my_color"/>

Hope this should fix your problem.

Answer 3

Just create a new color.xml file in /res/values/color.xml and put code like the following in it:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="editcolor">#ff99ffff</color>
    <color name="transparent">#00000000</color>
</resources>

Answer 4

you can't use ?attr in xml drawable resources because drawable resources created by aapt in compile time. Attr resources used for dynamic connection in runtime

Answer 5

try this way put color in android:drawable as below

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="?android:attr/colorPressedHighlight"/> <!-- pressed -->
    <item android:state_focused="true" android:drawable="@color/blue"/> <!-- focused -->
    <item android:drawable="@color/section_list_background"/> <!-- default -->
</selector>

or

<selector xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:state_focused="true" android:color="?android:attr/colorPressedHighlight"/>
   <item android:state_enabled="false" android:color="@color/section_list_background" />
   <item android:color="@color/testcolor5"/>
 </selector>