1、Alert是一個警告對話框，使用ALERTTYPE對應的聲音進行語音提示，應用程式可以不顯示ALERT框，調用playsound方法，并傳入Display類執行個體的引用做為參數，實作語音提示。
AlertType.WARNING.playsound(display);
2、效果
3、代碼
package hello;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class HelloMIDlet extends MIDlet implements CommandListener{
privateboolean midletPaused = false;
//<editor-fold defaultstate="collapsed" desc="Generated Fields ">
privateCommand exitCommand;
private Formform;
privateStringItem stringItem;
//</editor-fold>
privateboolean blissafeexit;
privateAlert alert;
publicHelloMIDlet() {
}
//<editor-fold defaultstate="collapsed" desc="Generated Methods ">
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Method: initialize ">
private voidinitialize() {
// write pre-initialize user code here
// write post-initialize user code here
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Method: startMIDlet ">
public voidstartMIDlet() {
// write pre-action user code here
blissafeexit=false;
switchDisplayable(null, getForm());
// write post-action user code here
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Method: resumeMIDlet ">
public voidresumeMIDlet() {
// write pre-action user code here
// write post-action user code here
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Method: switchDisplayable ">
public voidswitchDisplayable(Alert alert, Displayable nextDisplayable) {
// write pre-switch user code here
Display display = getDisplay();
if (alert == null) {
display.setCurrent(nextDisplayable);
} else {
display.setCurrent(alert, nextDisplayable);
}
// write post-switch user code here
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Method: commandAction for Displayables">
public voidcommandAction(Command command, Displayable displayable) {
// write pre-action user code here
if (displayable == form) {
if (command == exitCommand) {
// write pre-action user code here
exitMIDlet();
// write post-action user code here
}
}
// write post-action user code here
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Getter: exitCommand ">
publicCommand getExitCommand() {
if (exitCommand == null) {
// write pre-init user code here
exitCommand = new Command("Exit", Command.EXIT, 0);
// write post-init user code here
}
return exitCommand;
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Getter: form ">
public FormgetForm() {
if (form == null) {
// write pre-init user code here
form = new Form("Welcome", new Item[] { getStringItem() });
form.addCommand(getExitCommand());
form.setCommandListener(this);
// write post-init user code here
}
return form;
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Generated Getter: stringItem ">
publicStringItem getStringItem() {
if (stringItem == null) {
// write pre-init user code here
stringItem = new StringItem("/u8F6F/u4EF6/u5F00/u53D1/u57FA/u5730","ALERT/u6F14/u793A");
// write post-init user code here
}
return stringItem;
}
//</editor-fold>
publicDisplay getDisplay () {
return Display.getDisplay(this);
}
public void exitMIDlet() {
try{
if (!blissafeexit){
alert=newAlert("警告","系統正忙，請再嘗試一次退出",null,AlertType.WARNING);
alert.setTimeout(Alert.FOREVER);
switchDisplayable(alert,form);
destroyApp(false);
}
else{
switchDisplayable (null, null);
destroyApp(true);
notifyDestroyed();
}
}
catch (MIDletStateChangeException exception){
blissafeexit=true;
}
}
public voidstartApp() {
if (midletPaused) {
resumeMIDlet ();
} else {
initialize ();
startMIDlet ();
}
midletPaused = false;
}
public voidpauseApp() {
midletPaused = true;
}
publicvoid destroyApp(boolean unconditional) throwsMIDletStateChangeException {
if (!unconditional){
throw newMIDletStateChangeException();
}
}
}
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