5.User Interface/Styles and Themes

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textColor="#00FF00"
    android:typeface="monospace"
    android:text="@string/hello" />

could be changed into

// res/value/style
<style name="CodeFont" >
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:textColor">#00FF00</item>
        <item name="android:typeface">monospace</item>
 </style>

<TextView
        style="@style/CodeFont"
        android:text="@string/hello_world" />