Answer
In order to define a styles that can be used as theme for your app widget or layout, define the styles as a resource in the file. The resource file can have any name but ends with .xml
e.g. the resource file can be named as styles.xml in the res/values directory of your project as:
res/values/styles.xml
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<?xml version="1.0" encoding="utf-8"?>
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<resources>
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<style name="CodeFont" parent="@android:style/TextAppearance.Medium">
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<item name="android:layout_width">fill_parent</item>
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<item name="android:layout_height">wrap_content</item>
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<item name="android:textColor">#00FF00</item>
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<item name="android:typeface">monospace</item>
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</style>
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</resources>