app/src/main/res/layout/activity_main.xml

   1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   2     xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
   3     android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
   4     android:paddingRight="@dimen/activity_horizontal_margin"
   5     android:paddingTop="@dimen/activity_vertical_margin"
   6     android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
   7
   8     <TextView android:text="@string/hello_world" android:layout_width="wrap_content"
   9         android:layout_height="wrap_content" />
  10
  11 </RelativeLayout>