Build app layout:

- Add EditText and Button elements
  - Update string resources

res/layout/main.xml

@@ -3,5 +3,14 @@
     android:orientation="horizontal"
     android:layout_width="match_parent"
     android:layout_height="match_parent" >
+    <EditText
+        android:id="@+id/edit_message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:hint="@string/edit_message" />
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/button_send" />
 </LinearLayout>
 

res/values/strings.xml

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">MainActivity</string>
+    <string name="app_name">Sample App</string>
+    <string name="edit_message">Enter a message</string>
+    <string name="button_send">Send</string>
+    <string name="menu_settings">Settings</string>
+    <string name="title_activity_main">MainActivity</string>
 </resources>