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I have a theme that refuses to be applied to activities - none of the styles are applied. If I don't supply the layout_width / layout_height attributes for <Button> it also gets a runtime error, showing that the Button class isn't being applied. /res/values/themes.xml : <?xml version="1.0" encoding="utf-8"?> <resources> <style name="Theme" parent="android:style/Theme.Black"> <item name="android:windowNoTitle">true</item> <item name="android:buttonStyle">@style/Button</item> <item name="android:windowBackground">@color/page_background_light</item> <item name="android:textAppearance">@style/TextAppearance</item> </style> </resources> /res/values/styles.xml : <?xml version="1.0" encoding="utf-8"?> <resources> <style name="TextAppearance" parent="@android:style/TextAppearance"> <item name="android:textSize">12sp</item> <item name="android:textColor">@color/darkblue</item> </style> <style name="Button" parent="@android:style/Widget.Button"> <item name="android:layout_width">fill_parent</item> <item name="android:layout_height">wrap_content</item>  </style> </resources> and the relevant manifest setting : <application android:icon="@drawable/icon" android:label="@string/app_name" android:theme="@style/Theme"> What's the obvious mistake I'm missing?

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