DT 8025 2016 Practical 3

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Objectives

There are three main objectives for this practical:

  • Learn about and use the concept of service in Android
  • Learn about and use the concepts related to network programming in Android
  • Integrated several concepts and techniques learned in this course to implement an Android application


Instructions

Start with a list of scenarios (use-cases) that the following application should be able to deal with: the scenarios should specify what kind of interactions the app should support in which order so as to realize users' requirements. Subsequently make an architectural design (preferably, but necessarily, using notations such as UML Class Diagrams an Sequence Diagrams) to show how the application should be decomposed into a number of activities and services. For each activity design the layout beforehand. Then, start programming. After you are doing, update the scenarios and design to reflect what you have actually implemented; use the scenarios as test-cases and make sure that the app does what it is supposed to.

Submit a single .zip file on blackboard with two folders: the first containing a single pdf reporting on the scenarios, design, test-cases and their outcomes, and the other containing the Eclipse project.


Rock Paper Scissors Online Game for Android!

Overview

The goal of this project is to implement a simple Android app for a Rock Paper Scissors online game. The functionalities that we adopt in our practical is to:

  • Register on the server: ready to play (available),
  • Read the list of available players,
  • Send/Discard a play request with another player,
  • Accept/reject a play request from another player,
  • Fetch the list of play requests either from or to the current player,
  • Make a choice (Rock/Paper/Scissors) and fetch the choice of the other player
  • Leave a game session, and
  • Exit.

Starting up

During the development, you run the server on your own computer and use it as the RPS Server. In any case, your app should get the IP from the user and the IP should not be hard coded.

To compile the java code for the server, go to the folder containing the source and execute (assuming JDK has already been installed and configured) 

javac RPSServer.java

and, then run the server by executing the following command (you may not need to use '-cp .'). 

java -cp . RPSServer

The server will now be started and listen on port 4444. You will see 'Started server on port 4444' message on the terminal.

The Application

To achieve this, you will be given an IP address of an RPS server implemented and installed on a computer. The server listens on port 4444.

Your app should first allow the user to enter this IP address and a unique ID which is to be used in requests; use your HH account login name as the unique ID throughout this practical.

Then the app tries to connect to the server; if unsuccessful it will make three attempts with a 10 second delay in between (while providing sufficient information as toast messages). If successful, the client will receive the following tag from the server 

<Accepted connection from  id +/>

where id is the unique identifier (account name) provided by the client. Then, the client needs to send the ready to play command to the server to be visible by others 

<ReadyToPlay/>

It will then receive the following tag from the server (in case of no error) 

<Welcome to Rock Paper Scissors Online Game!/>


Then, the app will provide three possible options:

  • view online players (to send play request to),
  • view pending play requests to be answered, and
  • view sent play requests (waiting/accepted/rejected).


View Online Players

The app shows a layout in which the list of online players and their status (idle/busy/waiting) is shown. To fetch the list of online players the client sends the following request 

<OnlinePlayers/>

The server sends the list of online players one by one like 

<OnlinePlayer name="Masoumeh" status="waiting"/>
<OnlinePlayer name="Mahsa" status="idle"/>
<OnlinePlayer name="Sebastian" status="busy"/>

Send Play Request

The user can select one of the idle players to send a play request to. When the user selects the player (e.g., Mahsa) the client sends the following structure to the server 

<PlayRequest Mahsa/>

The serve will reply to the request 

<Play request was sent to Mahsa!/>

This is shown by a toast message and the app will return to the main menu.

View Play Request For X

The user may ask whether there has been any play request to be . In this case, after this option is selected from the main menu, the client send the following command 

 <PlayRequestsForMe/>

The server sends all pending requests for the participant one by one like 

<PlayRequest From="Masoumeh" With="Mahsa" status="pending"/>

Accept/Reject Play Request

The user may select one of the requests for him/her and accept/reject the request. 

  <AcceptPlayRequest Masoumeh/>

or 

  <RejectPlayRequest Masoumeh/>

The server will then update the status of the request to 'accepted' and 'rejected' respectively, and send back 

<PlayRequest From="Masoumeh" With="Mahsa" status="accepted/rejected"/>

If the user accepts a request the app automatically moves to the play game view in which the user starts to play.

View Sent Play Request

The user may ask for the play requests sent by him/her. In this case, after this option is selected from the main menu, the client send the following command 

 <MyPlayRequests/>

The server sends all requests from him/her one by one like 

<PlayRequest From="Masoumeh" With="Mahsa" status="pending/accepted/rejected/discarded"/>

An accepted play request shows on active (ongoing) game session. The user can select an accepted request and starts to play. (note: a user can participate at most in one game at a same time).

Discard Play Request

The user may decide to discard one of his/her request by select on the pending (not accepted or rejected) requests and send the following command 

  <DiscardPlayRequest Mahsa/>

The server will then update the status of the correspondent request to 'discarded' and send back 

<PlayRequest From="Masoumeh" With="Mahsa" status="discarded"/>

Play Rock Paper Scissors

The game happens in the play view. In this view, the user makes his/her choice (rock/paper/scissors) and also sees the choice of the other player (obviously not before making his/her choice!). When the user makes the choice, the client sends the following command 

  <Choice Rock/Paper/Scissors/>

To fetch the status of the game (choices), the client sends the check status request 

 <CheckGameStatus/>

Leave Game Session

The user may leave a game session by sending this command 

 <LeaveSession/>

This option is available in the play view.

Exit Game

To exit the game the client sends 

<Exit/>

NOTE

Please check the source code of the RPSServer for the complete list of commands and error messages.

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