Android back button now has home button functionality

Assets/RothenburgAR/Scripts/UI/InputManager.cs

@@ -34,7 +34,11 @@ namespace RothenburgAR.UI
 
             if (Input.GetKeyDown(KeyCode.Escape))
             {
-                Application.Quit();
+                if (Application.platform == RuntimePlatform.Android)
+                {
+                    AndroidJavaObject activity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
+                    activity.Call<bool>("moveTaskToBack", true);
+                }
             }
         }