Add class picker to Android UI

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

@@ -15,6 +15,12 @@
             android:id="@+id/spinner_style"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content" />
+
+        <Spinner
+            android:id="@+id/spinner_class"
+            android:visibility="invisible"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
     </android.support.v7.widget.Toolbar>
 
     <FrameLayout

android/java/app/src/main/res/values/strings.xml

@@ -16,8 +16,19 @@
         <item>Basic</item>
         <item>Outdoors</item>
         <item>Satellite</item>
-        <!--<item>Pencil</item>-->
-        <!--<item>Empty</item>-->
+        <item>Pencil</item>
+        <item>Empty</item>
+    </string-array>
+
+    <string-array name="outdoors_class_list">
+        <item>Day</item>
+        <item>Night</item>
+    </string-array>
+
+    <string-array name="satellite_class_list">
+        <item>Labels + Contours</item>
+        <item>Labels Only</item>
+        <item>No Labels</item>
     </string-array>
 
 </resources>