note.java

用高级API实现的简单笔记本

import java.util.Vector;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.List;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class Note extends MIDlet implements CommandListener{
    Display dis;
    List list;
    TextBox tb;
    TextBox tb2;
    Form f;
    TextField tf;
    Command cmdEXIT;
    Command cmdADD;
    Command cmdRENAME;
    Command cmdEDIT;
    Command cmdCANCEL;
    Command cmdSAVE;
    Command cmdBACK;
    Command cmdBREAK;
    Vector v;
    Alert alert1;
    Alert alert2;
    Alert alert3;
    static int index;
    static int count = 0;
    static Displayable d;
    static boolean bl = true;
	public Note() {
		// TODO Auto-generated constructor stub
		dis = Display.getDisplay(this);
        list = new List("小小笔记本",Choice.IMPLICIT);
		tb = new TextBox("","",256,TextField.ANY);
		tb2 = new TextBox("","",256,TextField.ANY);
		f = new Form("- 重命名 -");
		tf = new TextField("请输入新文件名","",10,TextField.ANY);
		cmdEXIT = new Command("退出",Command.EXIT,1);
		cmdADD = new Command("新增",Command.SCREEN,1);
		cmdRENAME = new Command("重命名",Command.SCREEN,1);
		cmdEDIT = new Command("编辑",Command.SCREEN,1);
		cmdCANCEL = new Command("删除",Command.CANCEL,1);
		cmdSAVE = new Command("保存",Command.SCREEN,1);
		cmdBACK = new Command("返回",Command.BACK,1);
		cmdBREAK = new Command("退出",Command.EXIT,1);
		v = new Vector(10);
		alert1 = new Alert("","Sorry, no file can be Active!",null,AlertType.WARNING);
		alert2 = new Alert("","保存成功！",null,AlertType.INFO);
		alert3 = new Alert("","改动将不被保存！\n   是否仍要退出？",null,AlertType.WARNING);
		alert3.setTimeout(Alert.FOREVER);
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}
    // 添加按键群
	public void addCommands(){
		list.addCommand(cmdEXIT);
        list.addCommand(cmdADD);
        list.addCommand(cmdRENAME);
        list.addCommand(cmdEDIT);
        list.addCommand(cmdCANCEL);
        tb.addCommand(cmdBACK);
        tb.addCommand(cmdSAVE);
        tb2.addCommand(cmdBACK);
        tb2.addCommand(cmdSAVE);
        f.removeCommand(cmdSAVE);
		f.addCommand(cmdBACK);
        f.addCommand(cmdEDIT);
        alert3.addCommand(cmdSAVE);
        alert3.addCommand(cmdBREAK);
	}
	// 添加
	public void addNote(){
	    tb.setString("");
	    dis.setCurrent(tb);
	}
	// 编辑
	public void editNote(){
		bl = true;
		if(list.size()!=0){
		  index = list.getSelectedIndex();
		  tb2.setTitle("- 编辑模式 -"+list.getString(index));
		  //System.out.println((String)(v.elementAt(index)));
		  tb2.setString((String)(v.elementAt(index)));
		  dis.setCurrent(tb2);
		}else{
			dis.setCurrent(alert1);
		}
	}
	// 删除
	public void cancelNote(){
		if(list.size()!=0){
			index = list.getSelectedIndex();
			v.removeElementAt(index);
			list.delete(index);
		}else{
			dis.setCurrent(alert1);
		}
	}
	// 重命名
	public void reName(){
		f.removeCommand(cmdEDIT);
		f.addCommand(cmdSAVE);
		index = list.getSelectedIndex();
		if(list.size()==0){
		  dis.setCurrent(alert1);
		}else{
		  bl = true;
		  f.deleteAll();
		  f.append(tf);
		  tf.setString(list.getString(index));
		  dis.setCurrent(f);
		}
	}
	// Start()
	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		addCommands();
		list.setCommandListener(this);
		tb.setCommandListener(this);
		tb2.setCommandListener(this);
		f.setCommandListener(this);
		alert3.setCommandListener(this);
		dis.setCurrent(list);
	}
    // 监听
	public void commandAction(Command cmd, Displayable disp) {
		// TODO Auto-generated method stub
		if(cmd==List.SELECT_COMMAND){
			showNote();
		}
		if(disp==tb||disp==tb2||disp==f||disp==alert3){
			if(cmd==cmdSAVE){
				saveNote(disp);
				
			}else if(cmd==cmdBACK){
				if(bl==true){
					  dis.setCurrent(alert3,list);
				}else
					  backToList(); 
			}
			if(cmd==cmdBREAK){
				backToList();
			}
		}
		
		if(cmd==cmdEXIT){
			  notifyDestroyed();
		}
        if(cmd==cmdADD){
			  addNote();
		}
        if(cmd==cmdEDIT){
			  editNote();
		}
        if(cmd==cmdCANCEL){
        	cancelNote();
        }
        if(cmd==cmdRENAME){
        	reName();
        }
	}
	// 保存
	public void saveNote(Displayable d){
		bl = false;
		if(d == alert3){
			dis.setCurrent(alert2,list);  // 保存并退出
			if(list.size()==0)
			    d = tb;
			else{
				d = tb2;
			    list.set(index, tf.getString(), null);
			}
		}else{
			dis.setCurrent(alert2,list);   // 仅仅提示保存成功
		}
		if(d == tb){
			list.append("文档"+count, null);
			v.addElement(tb.getString());
	        count++;
		}
		if(d == tb2){
			String s = tb2.getTitle();
			list.set(list.getSelectedIndex(), s.substring("- 查看模式 -".length(), s.length()), null);
			v.setElementAt(tb2.getString(), list.getSelectedIndex());
		}
		if(d == f){
			list.set(index, tf.getString(), null);
		}
	}
	// 返回
	public void backToList(){
		bl = true;
		dis.setCurrent(list);
	}
    // 查看
	public void showNote(){
		f.deleteAll();
		f.removeCommand(cmdSAVE);
		f.removeCommand(cmdBACK);
        f.addCommand(cmdEDIT);
        f.addCommand(cmdBREAK);
		f.setTitle("- 查看模式 -"+list.getString(list.getSelectedIndex()));
		index = list.getSelectedIndex();
		//System.out.println((String)(v.elementAt(index)));
		f.append((String)(v.elementAt(index)));
		dis.setCurrent(f);
	}
}