How to use Style

Create style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="DetailTextView" parent="@android:style/TextAppearance">
        <item name="android:layout_width">wrap_content</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:textSize">14sp</item>
        <item name="android:textStyle">bold</item>
    </style>
    <style name="DateTimeButton" parent="@android:style/Widget.Button">
        <item name="android:layout_width">fill_parent</item>
        <item name="android:layout_height">wrap_content</item>
        <item name="android:gravity">left|center_vertical</item>
        <item name="android:textSize">19sp</item>
    </style>
</resources>

Use it in layout

<TextView android:id="@+id/TextView01" android:text="What" style="@style/DetailTextView" />