mainscreen.java

j2me实例代码

package serverlet;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.List;
import javax.microedition.io.*;
import java.io.*;
import javax.microedition.lcdui.*;

public class MainScreen extends List implements CommandListener {

	private static Displayable instance;
	synchronized public static Displayable getInstance(){
		if(instance==null)
			instance=new MainScreen();
		System.out.println("cons MainScreen");
		return instance;
	}
	public MainScreen() {
		super("menu",Choice.IMPLICIT);
		append("view",null);
		append("add",null);
		addCommand(new Command("exit",Command.EXIT,1));
		setCommandListener(this);
	}

	public void commandAction(Command c, Displayable d) {
		if(c==List.SELECT_COMMAND){
			String cmd=getString(getSelectedIndex());
			if(cmd.equals("view")){
				//String url=Navigator.midlet.getAppProperty("midletuserdataurl");
				String url="http://localhost:8080/MIDPModule/midletuserdata/";
				System.out.println("cons thread....");
				GetUserDataThread t=new GetUserDataThread(url);
				System.out.println("start thread....");
				t.start();
			}else if(cmd.equals("add")){
				Navigator.flow(cmd);
			}
		}else{
			String cmd=c.getLabel();
			Navigator.flow(cmd);
		}

	}

}