Java by API/javax.microedition.lcdui/Alert

Alert.FOREVER

 
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
public class J2MEListImplicit extends MIDlet implements CommandListener {
  private Display display;
  private List list;
  private Command exit;
  Alert alert;
  public J2MEListImplicit() {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    list = new List("Menu:", List.IMPLICIT);
    list.append("New", null);
    list.append("Open", null);
    list.addCommand(exit);
    list.setCommandListener(this);
  }
  public void startApp() {
    display.setCurrent(list);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command command, Displayable displayable) {
    if (command == List.SELECT_COMMAND) {
      String selection = list.getString(list.getSelectedIndex());
      alert = new Alert("Option Selected", selection, null, null);
      alert.setTimeout(Alert.FOREVER);
      alert.setType(AlertType.INFO);
      display.setCurrent(alert);
    } else if (command == exit) {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}

Alert: setTimeout(int value)

 
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
public class J2MEListImplicit extends MIDlet implements CommandListener {
  private Display display;
  private List list;
  private Command exit;
  Alert alert;
  public J2MEListImplicit() {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    list = new List("Menu:", List.IMPLICIT);
    list.append("New", null);
    list.append("Open", null);
    list.addCommand(exit);
    list.setCommandListener(this);
  }
  public void startApp() {
    display.setCurrent(list);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command command, Displayable displayable) {
    if (command == List.SELECT_COMMAND) {
      String selection = list.getString(list.getSelectedIndex());
      alert = new Alert("Option Selected", selection, null, null);
      alert.setTimeout(Alert.FOREVER);
      alert.setType(AlertType.INFO);
      display.setCurrent(alert);
    } else if (command == exit) {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}

Alert: setType(AlertType type)

 
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.List;
import javax.microedition.midlet.MIDlet;
public class J2MEListImplicit extends MIDlet implements CommandListener {
  private Display display;
  private List list;
  private Command exit;
  Alert alert;
  public J2MEListImplicit() {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    list = new List("Menu:", List.IMPLICIT);
    list.append("New", null);
    list.append("Open", null);
    list.addCommand(exit);
    list.setCommandListener(this);
  }
  public void startApp() {
    display.setCurrent(list);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command command, Displayable displayable) {
    if (command == List.SELECT_COMMAND) {
      String selection = list.getString(list.getSelectedIndex());
      alert = new Alert("Option Selected", selection, null, null);
      alert.setTimeout(Alert.FOREVER);
      alert.setType(AlertType.INFO);
      display.setCurrent(alert);
    } else if (command == exit) {
      destroyApp(false);
      notifyDestroyed();
    }
  }
}

new Alert(String title, String alertText, Image alertImage, AlertType alertType)

    
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
public class Main extends MIDlet implements CommandListener {
  private Command exitCommand = new Command("Exit", Command.EXIT, 1);
  private Command setLabelCommand = new Command("Label", Command.SCREEN, 1);
  private Command setTextCommand = new Command("Text", Command.SCREEN, 1);
  private Command getLabelTextCommand = new Command("Get", Command.SCREEN, 1);
  private StringItem stringItem1 = new StringItem("Label1", "Content1");
  private StringItem stringItem2 = new StringItem(null, "Content2");
  private Display display = Display.getDisplay(this);
  public Main() {
  }
  public void startApp() {
    Form aForm = new Form("StringItem");
    aForm.append(stringItem1);
    aForm.append(stringItem2);
    aForm.addCommand(exitCommand);
    aForm.addCommand(setLabelCommand);
    aForm.addCommand(setTextCommand);
    aForm.addCommand(getLabelTextCommand);
    aForm.setCommandListener(this);
    display.setCurrent(aForm);
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(false);
      notifyDestroyed();
    }
    if (c == setLabelCommand)
      stringItem1.setLabel("new label");
    if (c == setTextCommand)
      stringItem2.setText("new text");
    if (c == getLabelTextCommand) {
      Alert alert = new Alert("Info", stringItem1.getLabel() + ":" + stringItem1.getText(), null,
          AlertType.INFO);
      alert.setTimeout(5000);
      display.setCurrent(alert);
    }
  }
}