Pessoal,
Estou iniciando em J2ME e fiz um programa básico para mostrar um List, escolha um Element e mostrar o valor escolhido, entretanto, depois que escolho o primeiro valor, ele não se modifica mais. Alguém poderia me ajudar com o que está acontecendo?
Atenciosamente,
Petrus Bastos.
[code]/*
- To change this template, choose Tools | Templates
- and open the template in the editor.
*/
package hello;
import javax.microedition.midlet.;
import javax.microedition.lcdui.;
import org.netbeans.microedition.lcdui.SplashScreen;
/**
-
@author Petrus Bastos
*/
public class HelloMIDlet extends MIDlet implements CommandListener {private boolean midletPaused = false;
//
private Command exitCommand;
private Command itemCommand;
private Command exitCommand1;
private SplashScreen splashScreen;
private List list;
private Alert alert;
private Image image1;
private Font font1;
///**
- The HelloMIDlet constructor.
*/
public HelloMIDlet() {
}
//
////
/**-
Initilizes the application.
-
It is called only once when the MIDlet is started. The method is called before the
startMIDletmethod.
*/
private void initialize() {
// write pre-initialize user code here// write post-initialize user code here
}
//
//
/**- Performs an action assigned to the Mobile Device - MIDlet Started point.
*/
public void startMIDlet() {
// write pre-action user code here
switchDisplayable(null, getSplashScreen());
// write post-action user code here
}
//
//
/**-
Performs an action assigned to the Mobile Device - MIDlet Resumed point.
*/
public void resumeMIDlet() {
// write pre-action user code here// write post-action user code here
}
//
//
/**- Switches a current displayable in a display. The
displayinstance is taken fromgetDisplaymethod. This method is used by all actions in the design for switching displayable. -
@param alert the Alert which is temporarily set to the display; if
null, thennextDisplayableis set immediately -
@param nextDisplayable the Displayable to be set
*/
public void switchDisplayable(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
}
//
//
/**- Called by a system to indicated that a command has been invoked on a particular displayable.
- @param command the Command that was invoked
-
@param displayable the Displayable where the command was invoked
*/
public void commandAction(Command command, Displayable displayable) {
// write pre-action user code here
if (displayable == list) {
if (command == List.SELECT_COMMAND) {
// write pre-action user code here
listAction();
// write post-action user code here
} else if (command == exitCommand1) {
// write pre-action user code here
exitMIDlet();
// write post-action user code here
} else if (command == itemCommand) {
// write pre-action user code here
switchDisplayable(getAlert(), getList());
// write post-action user code here
}
} else if (displayable == splashScreen) {
if (command == SplashScreen.DISMISS_COMMAND) {
// write pre-action user code here
switchDisplayable(null, getList());
// write post-action user code here
}
}
// write post-action user code here
}
//
//
/**- Returns an initiliazed instance of exitCommand component.
-
@return the initialized component instance
*/
public Command 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;
}
//
//
/**- Returns an initiliazed instance of splashScreen component.
-
@return the initialized component instance
*/
public SplashScreen getSplashScreen() {
if (splashScreen == null) {
// write pre-init user code here
splashScreen = new SplashScreen(getDisplay());
splashScreen.setTitle(“splashScreen”);
splashScreen.setCommandListener(this);
splashScreen.setFullScreenMode(true);
splashScreen.setImage(getImage1());
splashScreen.setText(“Aguarde…”);
splashScreen.setTextFont(getFont1());
splashScreen.setTimeout(2000);
// write post-init user code here
}
return splashScreen;
}
//
//
/**- Returns an initiliazed instance of image1 component.
-
@return the initialized component instance
*/
public Image getImage1() {
if (image1 == null) {
// write pre-init user code here
try {
image1 = Image.createImage("/logo.gif");
} catch (java.io.IOException e) {
e.printStackTrace();
}
// write post-init user code here
}
return image1;
}
//
//
/**- Returns an initiliazed instance of itemCommand component.
-
@return the initialized component instance
*/
public Command getItemCommand() {
if (itemCommand == null) {
// write pre-init user code here
itemCommand = new Command(“Escolher”, Command.SCREEN, 0);
// write post-init user code here
}
return itemCommand;
}
//
//
/**-
Performs an action assigned to the selected list element in the list component.
*/
public void listAction() {
// enter pre-action user code here
switch (getList().getSelectedIndex()) {
case 0:
// write pre-action user code here// write post-action user code here break; case 1: // write pre-action user code here // write post-action user code here break; case 2: // write pre-action user code here // write post-action user code here break; case 3: // write pre-action user code here // write post-action user code here break;}
// enter post-action user code here
}
//
//
/**- Returns an initiliazed instance of font1 component.
-
@return the initialized component instance
*/
public Font getFont1() {
if (font1 == null) {
// write pre-init user code here
font1 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL);
// write post-init user code here
}
return font1;
}
//
//
/**- Returns an initiliazed instance of exitCommand1 component.
-
@return the initialized component instance
*/
public Command getExitCommand1() {
if (exitCommand1 == null) {
// write pre-init user code here
exitCommand1 = new Command(“Sair”, Command.EXIT, 0);
// write post-init user code here
}
return exitCommand1;
}
//
//
/**- Returns an initiliazed instance of alert component.
-
@return the initialized component instance
*/
public Alert getAlert() {
if (alert == null) {
// write pre-init user code here
alert = new Alert(“Alerta”, "Você escolheu: " + (list.getSelectedIndex() + 1), null, AlertType.INFO);
alert.setTimeout(Alert.FOREVER);
// write post-init user code here
}
return alert;
}
//
//
/**- Returns an initiliazed instance of list component.
-
@return the initialized component instance
*/
public List getList() {
if (list == null) {
// write pre-init user code here
list = new List(“Lista de Cobran\u00E7as”, Choice.EXCLUSIVE);
list.append(“Cobran\u00E7a 1”, null);
list.append(“Cobran\u00E7a 2”, null);
list.append(“Cobran\u00E7a 3”, null);
list.append(“Cobran\u00E7a 4”, null);
list.addCommand(getItemCommand());
list.addCommand(getExitCommand1());
list.setCommandListener(this);
list.setFitPolicy(Choice.TEXT_WRAP_DEFAULT);
list.setSelectCommand(getItemCommand());
list.setSelectedFlags(new boolean[] { false, false, false, false });
// write post-init user code here
}
return list;
}
//
/**
- Returns a display instance.
-
@return the display instance.
*/
public Display getDisplay() {
return Display.getDisplay(this);
}
/**
- Exits MIDlet.
*/
public void exitMIDlet() {
switchDisplayable(null, null);
destroyApp(true);
notifyDestroyed();
}
/**
- Called when MIDlet is started.
- Checks whether the MIDlet have been already started and initialize/starts or resumes the MIDlet.
*/
public void startApp() {
if (midletPaused) {
resumeMIDlet();
} else {
initialize();
startMIDlet();
}
midletPaused = false;
}
/**
- Called when MIDlet is paused.
*/
public void pauseApp() {
midletPaused = true;
}
/**
- Called to signal the MIDlet to terminate.
-
@param unconditional if true, then the MIDlet has to be unconditionally terminated and all resources has to be released.
*/
public void destroyApp(boolean unconditional) {
}
}
[/code]
- The HelloMIDlet constructor.
Este tal de netbeans…