Beginning Android 3

Chapter 24. Defining and Using Styles

Every now and then, you will find some code with a cryptic style attribute in a layout element. For example, in the chapter on threading, the following ProgressBar was presented:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <ProgressBar android:id="@+id/progress"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />
</LinearLayout>

Something about that magic style attribute changed our ProgressBar from a normal circle to a horizontal bar.

This chapter will briefly explore ...