Laying Out the UI
Open app/res/layout/activity_quiz.xml. If you see a graphical preview of the file, select the Text tab at the bottom to see the backing XML.
Currently, activity_quiz.xml defines the default activity layout. The defaults change frequently, but the XML will look something like Listing 1.1.
Listing 1.1 Default activity layout (activity_quiz.xml)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_quiz" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="16dp" android:paddingLeft="16dp" android:paddingRight="16dp" android:paddingTop="16dp" tools:context="com.bignerdranch.android.geoquiz.QuizActivity"> ...
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