Add drawer with state information

platform_tools/android/apps/viewer/src/main/res/layout/activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:id="@+id/mainLayout"
-    android:orientation="vertical"
+
+<android.support.v4.widget.DrawerLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/drawerLayout"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    tools:context=".ViewerActivity">
-
-    <SurfaceView
-        android:id="@+id/surfaceView"
+    android:layout_height="match_parent">
+    <!-- The main content view -->
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        xmlns:tools="http://schemas.android.com/tools"
+        android:id="@+id/mainLayout"
+        android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_centerVertical="true"
-        android:layout_centerHorizontal="true" />
+        tools:context=".ViewerActivity">
 
-</LinearLayout>
+        <SurfaceView
+            android:id="@+id/surfaceView"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:layout_centerVertical="true"
+            android:layout_centerHorizontal="true" />
+
+    </LinearLayout>
+
+    <!-- The navigation drawer -->
+    <ListView android:id="@+id/leftDrawer"
+        android:layout_width="240dp"
+        android:layout_height="match_parent"
+        android:layout_gravity="start"
+        android:choiceMode="singleChoice"
+        android:divider="@android:color/transparent"
+        android:dividerHeight="0dp"
+        android:background="@android:color/background_light"/>
+</android.support.v4.widget.DrawerLayout>
+