让JavaME程序真正Run Anywhere

欢迎指教，tengshiquan@yahoo.com.cn

　　"Write once,run anywhere" 是java的口号，但在J2ME平台上做的应用，要想不改动代码就run anywhere，难度是很大的。假如要把一个应用程序做到让大多数的机型都适用，就要考虑到方方面面，其难度是相当大的。

// Player types
static final int STANDARD = 0; //For MIDI
static final int NOKIA = 1; //For ott
static final int SAMSUNG = 2; //For mmf
static final int NEC = 3; //For MIDI


static final String[] supportedPlayerTypes = {
"javax.microedition.media.Player", //STANDARD API
"com.nokia.mid.sound.Sound", // Nokia
"com.samsung.util.AudioClip", //samsung
"com.nec.media.AudioClip", //nec
};

　　下面利用反射机制来动态加载：

public void determinePlayerType() {
// use most -> less use
isSupportSound = true;

for (int i = 0; i < supportedPlayerTypes.length; i++) {
// try to load a PRoper sound Player
try {

Class.forName(supportedPlayerTypes[i]); //加载当前的Player类型

playerType = i; //保存加载成功的类的类型
return;
} catch (Exception e) { //加载不成功，说明不支持，继续加载下一种
e.printStackTrace();
}
}
isSupportSound = false;
}

　　2. 下面就可以根据在载成功的类型来加载可以播放的声音资源了

public void createPlayer(String name) {
if (!isSupportSound)
return;

switch (playerType) {
case STANDARD: // for MIDI
case NEC:
createPlayerFactory("/" + name + ".mid");
break;
case NOKIA: //for ott
createPlayerFactory("/" + name + ".ott");
break;
case SAMSUNG: // for mmf
createPlayerFactory("/" + name + ".mmf");