fewalertsmidlet.java

j2me接口的例子,很不错的东东 可以做教程

import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class FewAlertsMIDlet extends MIDlet implements CommandListener {
    
    private Command exitCommand;
    private Command alarmCommand;
    private Command confirmCommand;
    private Command errorCommand;
    private Command infoCommand;
    private Command warningCommand;

    private Alert alarmAlert;
    private Alert confirmAlert;
    private Alert errorAlert;
    private Alert infoAlert;
    private Alert warningAlert;

    //The display for this MIDlet
    private Display display;

    public FewAlertsMIDlet() {
        display = Display.getDisplay(this);
        exitCommand = new Command("离开", Command.SCREEN, 1);
        alarmCommand = new Command("警报", Command.SCREEN, 2);
        confirmCommand = new Command("确认", Command.SCREEN, 2);
        errorCommand = new Command("错误", Command.SCREEN, 2);
        infoCommand = new Command("资讯", Command.SCREEN, 2);
        warningCommand = new Command("警告", Command.SCREEN, 2);

    }

    public void startApp() {
        TextBox main = new TextBox("主画面", "请按软键选择要执行的Alert", 256, TextField.ANY);
        alarmAlert = new Alert("警报", "这是一个\"警报\"信息窗口", null, AlertType.ALARM);
        confirmAlert = new Alert("确认", "这是一个\"确认\"信息窗口", null,
                                 AlertType.CONFIRMATION);
        errorAlert = new Alert("错误", "这是一个\"错误\"信息窗口", null, AlertType.ERROR);

        Image infoImage = null;
        try {
            infoImage = Image.createImage("/Sokoban.png");
        } catch (IOException e) {
        }

        infoAlert = new Alert("资讯", "这是一个\"资讯\"信息窗口", infoImage, AlertType.INFO);
        warningAlert = new Alert("警告", "这是一个\"警告\"信息窗口", null,
                                 AlertType.WARNING);

        alarmAlert.setTimeout(Alert.FOREVER);
        confirmAlert.setTimeout(3000);
        errorAlert.setTimeout(3000);
        infoAlert.setTimeout(3000);
        warningAlert.setTimeout(3000);

        main.addCommand(exitCommand);
        main.addCommand(alarmCommand);
        main.addCommand(confirmCommand);
        main.addCommand(errorCommand);
        main.addCommand(infoCommand);
        main.addCommand(warningCommand);

        main.setCommandListener(this);
        display.setCurrent(main);
    }

    public void pauseApp() {}

    public void destroyApp(boolean unconditional) {}

    public void commandAction(Command c, Displayable s) {
        if (c == exitCommand) {
            destroyApp(false);
            notifyDestroyed();
        }
        if (c == alarmCommand) {
            display.setCurrent(alarmAlert);
        }
        if (c == confirmCommand) {
            display.setCurrent(confirmAlert);
        }
        if (c == errorCommand) {
            display.setCurrent(errorAlert);
        }
        if (c == infoCommand) {
            display.setCurrent(infoAlert);
        }
        if (c == warningCommand) {
            display.setCurrent(warningAlert);
        }
    }
}