Cannot use standard android color attribute in custom color selector
- by Manish Gupta
So, android defines the following in themes.xml:
<style name="Theme">
...
<item name="colorPressedHighlight">@color/legacy_pressed_highlight</item>
</style>
and:
<style name="Theme.Holo">
...
<item name="colorPressedHighlight">@color/holo_blue_light</item>
</style>
I want to use this colorPressedHighlight as the background color for my custom Button when it is pressed. So I defined the following in res/color/app_button_background.xml:
<?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:colorPressedHighlight"/>
<item android:drawable="@android:color/transparent" />
</selector>
Finally, I define my custom ImageButton style:
<style name="App_ImageButtonStyle" parent="@android:style/Widget.ImageButton">
<item name="android:gravity">center</item>
<item name="android:background">@color/app_button_background</item>
</style>
I crash on app launch with the following call stack:
06-27 20:24:41.954: E/AndroidRuntime(532): Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML file line #6: <item> tag requires a 'drawable' attribute or child tag defining a drawable
06-27 20:24:41.954: E/AndroidRuntime(532): at android.graphics.drawable.StateListDrawable.inflate(StateListDrawable.java:178)
06-27 20:24:41.954: E/AndroidRuntime(532): at android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:867)
06-27 20:24:41.954: E/AndroidRuntime(532): at android.graphics.drawable.Drawable.createFromXml(Drawable.java:804)
06-27 20:24:41.954: E/AndroidRuntime(532): at android.content.res.Resources.loadDrawable(Resources.java:1920)
I know that directly accessing @color/legacy_pressed_highlight or @color/holo_blue_light instead of accessing them through the colorPressedHighlight fixes the crash but it does not solve the problem. Themes can vary, hence I need to access it through the colorPressedHighlight attribute.
PS: I had a similar problem to which I haven't found an answer yet. Can someone please help!
