Mobile Game Development in VS .NET

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Mobile Game Development
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The game must not go into pause mode in this situation because there is no game to pause. The reaction to an event depends on the state the game is in when the event takes place. Humans do this all the time. If the phone rings when you are in the shower, you are very likely to ignore it and let the answering machine (or your mom) take the call for you. However, if you were seated on the couch watching TV, you would just answer the call directly. As programmers, we have to be very careful to ensure a program always does something sensible with an event. One of the most common causes of programs crashing or getting stuck is events occurring in a sequence or at a time that the software designer didn t expect. The way to solve this is in our games is to use the state of the game to determine what the event hander actually does:
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private void handleIncomingCall() { if (state == GameState.PlayingGame) { pauseGame(); } }
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The handleIncomingCall method in the preceding code is the one that the game will call when a phone call arrives. It will pause a game only if it is playing. The method pauseGame sets the state of the game to paused:
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private void pauseGame() { state = GameState.GamePaused; }
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Now that we have a way for our game to deal with incoming calls, the final thing we need to do is get the handleIncomingCall method to run when the phone receives a call. Note We seem to have worked out what to do when a phone ca arr ves before we know how
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to detect the phone ca Th s s not actua y a bad th ng Qu te often n a deve opment, you w be work ng on many th ngs at the same t me, or you w be part of a team In these s tuat ons, you w work on d fferent components that w be fitted together to make the comp ete system At the start of the project, a p an w be drawn up show ng how these a fit together and the project w have an ntegrat on phase where the components are assemb ed to create the fin shed who e
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Now that we know what to do when a phone call arrives, we next have to detect the phone call itself.
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Part IV
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Making Mobile Games for Windows Phone 7 with XNA
Detecting Phone Calls
In 17, we saw how the accelerometer device in the Windows Phone uses events. A game gets acceleration readings by connecting a method to the event that is produced by the accelerometer when it has new values available. The process of responding to the start and end of phone calls is the same. The Windows Phone operating system provides events that methods in our game can be connected to. When the event occurs, the methods are called:
this.Activated += new EventHandler<EventArgs>(Game_Activated); this.Deactivated += new EventHandler<EventArgs>(Game_Deactivated);
The two preceding statements connect event handler methods to the Activated and Deactivated events that are produced by XNA. The Activated event is produced when a game starts running and also when a phone call ends. The Deactivated event is produced when a phone call starts. The two handler methods we have identified in the preceding statements are called Game_Activated and Game_Deactivated, respectively.
void Game_Deactivated(object sender, EventArgs e) { handleIncomingCall(); } void Game_Activated(object sender, EventArgs e) { resumeGame(); }
The method that is called when the game is deactivated just calls the handleIncomingCall method. When the call is finished, the Game_Activated method calls the resumeGame method to restart the game if it is paused. If the game is a fast-moving one, the player might prefer to resume it manually rather than be pitched straight back into a space battle immediately after the phone call has finished, so we might remove the call of resumeGame for this kind of game. With these methods in place, our game will now work correctly when a phone call arrives. When the player returns to the game, she will be pleased to find that she can just resume it from where she left off. The sequence goes like this: 1. The player opens the game. 2. The game begins running in the Main Menu state. 3. The player selects the game options and starts playing the game. 4. A phone call arrives.
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