Prepare app layout:

- Remove 'hello world' text
  - Change orientation to vertical, width & height to match_parent

res/layout/main.xml

@@ -1,13 +1,7 @@
 <?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"
-    >
-<TextView
-    android:layout_width="fill_parent"
-    android:layout_height="wrap_content"
-    android:text="Hello World, MainActivity"
-    />
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
 </LinearLayout>