Creating the SoundManager Class
The SoundManager class contains the instructions to play a basic sound and to set the backlight. It supports the following generic devices:
- MIDP 1: This device doesn't support sounds and backlight, so the methods will be empty.
- MIDP 2: This device supports sounds and backlight, so the lines of code between //#ifdef MIDP2 and //#endif will be selected.
- MIDP 1 NokiaUI: This device supports sounds and backlight, so the lines of the code between //#ifdef NOKIAUI and //#endif will be selected.
- MIDP 1 Motorola: This device supports only backlight, so the method to play a sound will be empty.
Listing 1 shows the code.
Creating the BUILD.XML File
In the BUILD.XML file, you will select the appropriate directories. It's a manual operation, so, it's best to create the XML files for each device and keep them.
In the case of the MIDP 2 profile, the preprocessing of the file SoundManager.java will produce this output:
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import javax.microedition.media.control.ToneControl;
import javax.microedition.lcdui.*;
import java.io.*;
public class SoundManager {
Display display;
public SoundManager(Display display) {
this.display = display;
}
public void doLight() {
display.flashBacklight (duration);
}
public void doSound() {
try {
InputStream is = getClass().getResourceAsStream("music.mid");
Player audioPlayer = Manager.createPlayer(is, "audio/midi");
audioPlayer.start();
} catch (IOException ioe) {
}
}
}
For the MIDP 1 profile, it produces:
import javax.microedition.lcdui.*;
import java.io.*;
public class SoundManager {
Display display;
public SoundManager(Display display) {
this.display = display;
}
public void doLight() {
}
public void doSound() {
}
}
You select the profile of the device in this line:
<wtkpreprocess srcdir="src" destdir="output\src" symbols="MIDP2" verbose="false"/>
Antenna takes the content of the attribute symbols (MIDP 2 in this example) and inserts
//#define MIDP2 at the beginning of each file, like this:
//#define MIDP2
//#ifdef MIDP2
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import javax.microedition.media.control.ToneControl;
//#endif
//#ifdef NOKIAUI
import com.nokia.mid.sound.*;
import com.nokia.mid.ui.*;
//#endif
//#ifdef MOTOROLA
import com.motorola.multimedia.*;
//#endif
import javax.microedition.lcdui.*;
import java.io.*;
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