Beginning Android 4

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"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"   android:orientation="vertical"   android:layout_width="fill_parent"   android:layout_height="fill_parent"   >   <ProgressBarandroid: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.

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