Second Life on a Mobile Phone Nii Annan September 2011 Dissertation submitted in partial fulfilment for the degree of Master of Science in Information Technology Department of Computing Science and Mathematics University of Stirling
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Second Life on a Mobile Phone Nii Annan September 2011 Dissertation submitted in partial fulfilment for the degree of Master of Science in Information Technology Department of Computing Science and Mathematics University of Stirling AbstractSecond Life™ is a multi-user virtual world which provides a three dimensional space shared by a number of avatars. They interact with their environment and one another through instant messaging as well as voice communications. The Inter-life project is developing a private island on Second Life to provide an educational research space aimed at finding ways to aid young people in developing social skills and navigating difficult transitions in their lives [1]. On this private island, the number of avatars in world at any given time may be small. This could make going in-world uninviting and thus overall interest reduces. The objective of this project was to change this by allowing a user to see who was in-world using a mobile phone application. This project aimed at developing a mobile phone application which would display a map of the Inter-life Island and indicate the current location of users online. The mobile platform of choice was an HTC 7 Trophy Windows Phone device running a Release Candidate version of Microsoft’s Windows Phone 7.5 operating system code named “Mango”. Methodology involved determining the requirements of the application, analysing the components needed, designing the system, implementation of software code and testing the application to eliminate errors. The most significant achievements in this project included, creating a log-in user interface, the map interface and features for showing the information of avatars online as well as plotting their location on the Inter-life Island map. A basic version of Twitter was also developed (Twittledoo) and incorporated within the main Inter-life application for sending messages. Attestation I understand the nature of plagiarism, and I am aware of the University’s policy on this I certify that this dissertation reports original work by me during my University project except for the following: The Code for the Twitter Client was helped developed by Dennis Delimarsky Signature (you must sign and date this page) Date AcknowledgementsThis project would not have materialized without the help and guidance of a few people. Sincere gratitude goes to Cliff Simpkins (Senior Product Manager; Windows Phone Developer Experience) who gave me the green light to use the freshly released Windows Phone Mango Beta for this work. In his words and I quote “You're good to use this to develop apps for a school project, and present about it and whatever” I would like to thank Dr Mario Kolberg for being of tremendous help during this period for giving me various insights as to how the Inter-life server works. Much appreciation also goes to Professor Magill and Dr Karla Parussel who gave me a detailed description of the Inter-life server architecture. Many thanks go to Dennis Delimarsky for helping out with the twitter code used within the Inter-life Windows Phone application. Much appreciation goes to Marco Giuliani for helping out with sections of the code in my work. Thanks to Pablo Almunia for supplying me with C# books and reference materials. Finally, loads of appreciation goes to all the staff at the Institute of Computing Science and Mathematics as well as course mates who made this entire academic year at the University of Stirling a part of my life I will always cherish. Table of ContentsSecond Life on a Mobile Phone 1 Abstract 2 Acknowledgements 4 Table of Contents 5 List of Figures 6 1Introduction 7 Background and Context 7 Scope and Objectives 8 Achievements 9 Overview of Dissertation 9 2State-of-The-Art 11 Second Life™ 11 The Inter-Life Project 11 Second Life Apps 11 Developing Applications for Windows 13 The .NET Framework 13 Programming in C-Sharp (C#) 14 Relationship between C-Sharp and the .Net Framework 15 Versions of Windows Phone – Brief Overview 15 Microsoft’s answer to Windows Mobile OS – Windows Phone 16 Market Share Projections 16 Networking and Web Services for Windows Phone 16 Using Sockets on Windows Phone 16 Character Encoding for Windows Phone 18 3Early Stages of Development 19 Requirement Phase 19 Use Case Diagrams for the System 19 Use Case for Component 1: Login and Avatar Details 19 Use Case for Component 2: Communication Support 20 Class Diagrams for the System 21 Class Diagram for Component 1 21 Class Diagram for Component 2: Communication Support 23 Designing the User Interfaces of the System 26 4Implementation Phase 28 Visual Studio Express for Windows Phone IDE 28 Writing XAML 29 Code Behind 29 Walkthrough of Apps Key Functionalities 30 SocketClient Class 31 SignInPage Class 31 MapPage Class 31 String Manipulation: Highly Essential 32 AvatarStuff Class 34 Plotting Avatar Location 36 Twittledoo – in-built Twitter Client for Inter-Life App Messaging 38 Registering an application name with Twitter - Twittledoo 38 AuthConstants Class 39 UserTwitterStuff Class 39 UrlConstants Class 40 OAuthClient Class 40 Twittledoo and Authentication Process 41 Testing 45 Testing for Suitable Encoding 45 Sending data using Unicode (little-endian) 45 Receiving data using Unicode (little-endian) 45 Receiving data using Unicode (big-endian) 46 Testing Range of Values for Plotting Avatar Locations 46 Multi-user Testing 46 Software Maintenance 47 User Feedback 48 5Conclusion 49 Summary 49 Evaluation 49 What worked 49 What did not work so well 50 Future Work 50 Region Expansion 50 Traveling Across Regions 50 Real Time Chatting Experience 51 Empty Strings from Inter-life server 51 Automatic Updates 51 Log out Button 51 Miscellaneous Bits 51 Pushing mobile hardware to its limits 51 Limited Knowledge of Programming in C# 52 References 53 Appendix 1 55
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