␡
- Understanding the Java WTK
- The RTTTLEx Application
- Creating a List of Ring Tones
- Understanding the MIDP List Class
- Working with the Display Object and the Displayable Interface
- Configuring Commands
- Registering CommandListeners
- The Methods of a MIDlet
- Selecting a Tune
- The MIDP Canvas Object
- Playing a Tune
- Conclusion
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Selecting a Tune
RTTTL tunes are listed on the RTTTLEx screen and played using the class RTTTLExCanvas. When the user selects a tune from the List object in RTTTLEx using the cell phone's up- and down-arrow buttons, and then presses the Play button, the Command object playCommand is trapped in RTTTLEx's commandAction() method, as shown in Listing 7:
Listing 7 Processing Commands in the RTTTLEx Class
public void commandAction(Command c, Displayable s) {
if (c == exitCommand) {
destroyApp(false);
notifyDestroyed();
}else if ((s == theList &&
c == List.SELECT_COMMAND) ||
c == playCommand) {
//Find out which tune has been selected
int i = theList.getSelectedIndex();
//Let the tune player, RTTTLExCanvas, know which
//tune has been selected
player.setIndex(i);
//Attach the player as the current
//UI display
display.setCurrent(player);
//do all necessary screen redrawing
player.serviceRepaints();
//play the tune!
player.playSound();
}
}
The actual work of getting the RTTTL file from the Internet and playing it is encapsulated in the class RTTTLExCanvas.