JavaMe开发：绘制文本框TextEdit

【问题描述】在JavaMe连载(3)-也说MVC设计模式 一文中提到了一个TextEdit类，但没有给出具体实现，TextEdit是采用GameCanvas绘制的文本编辑器。本文结合实例给出实现的方法。

【原理】

1 运用Graphics、GameCanvas绘制文本框和光标。

2 检测到输入事件时，跳转到 高级界面->TextBox 。通过系统调用输入法完成输入。

3 将TextBox输入的值返回给TextEdit对象。

【设计模式】

这个过程有点类似装饰模式，实际上，实现输入的还是TextBox，只是给TextBox装饰了一下，形成了一个漂亮的外观。

【代码清单】

TextEdit.java

package com.token.view.components;  
 
import javax.microedition.lcdui.Font;  
import javax.microedition.lcdui.Graphics;  
import javax.microedition.lcdui.game.GameCanvas;  
 
public class TextEdit extends GameCanvas  
{  
    private Font ft;  
      
    public int width;  
    public int height;  
      
    public TextEdit(GameCanvas canvas)   
    {  
        super(false);  
          
    }  
      
    //绘制文本框  
    public void drawTextBox(GameCanvas canvas, Graphics graphics, String text, int x, int y, boolean cursorBlinkOn)  
    {  
        //System.out.println("draw");  
        int padding = 4;  
        int margin = 2;  
          
        ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);  
        graphics.setFont(ft);  
          
        width = 3*canvas.getWidth()/5+2*padding;  
        height = ft.getHeight()+2*padding;  
 
        graphics.setColor(Color.frame);  
        graphics.fillRect(x+1,y+1,width+margin,height+margin);  
          
        graphics.setColor(Color.frameBg);  
        graphics.drawRect(x, y,width, height);  
        graphics.setColor(Color.background);  
        graphics.fillRect(x+1, y+1,width-1,height-1);  
          
        graphics.setColor(Color.text);  
        graphics.drawString(text, x+padding, y+padding, Graphics.TOP|Graphics.LEFT);  
          
        drawCursor(graphics, x+ft.stringWidth(text)+padding, y+padding, 1, ft.getHeight(), cursorBlinkOn);  
          
        canvas.flushGraphics(x,y,width,height);  
    }  
 
 
    //绘制光标  
    public void drawCursor(Graphics graphics, int x, int y, int width, int height, boolean cursorBlinkOn)  
    {  
        if(cursorBlinkOn)  
        {  
            ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);  
            graphics.setFont(ft);  
            graphics.setColor(0x0,0x0,0x0);  
            graphics.drawLine(x+width,y,x+width,y+height);  
        }  
    }  
}  

PopUpTextBox.java

package com.token.view;  
 
import javax.microedition.lcdui.Command;  
import javax.microedition.lcdui.CommandListener;  
import javax.microedition.lcdui.Displayable;  
import javax.microedition.lcdui.TextBox;  
 
import com.token.util.UIController;  
 
public class PopUpTextBox extends TextBox {  
 
      private UIController controller;  
      protected String canvasText = "";  
      private Command okCommand;  
      private Command cancelCommand;  
      private String object_name = null;  
      private String editor = null;  
      private Object args_t[];  
      private Object[] args;  
        
      
      public PopUpTextBox(UIController control, String title, String text, int maxsize, int constraints)   
      {  
          super(title, text, maxsize, constraints);  
          controller = control;  
            
          args = new Object[6];  
            
          okCommand = new Command("确定", Command.OK, 1);  
          cancelCommand = new Command("取消", Command.CANCEL, 1);  
            
          this.addCommand(okCommand);  
          this.addCommand(cancelCommand);  
          this.setCommandListener(new TextBoxListener());  
      }  
        
      public void init(Object[] args)  
      {  
          object_name = ((String)args[0]!=null)?(String)args[0]:"";  
          editor = ((String)args[1]!=null)?(String)args[1]:"";  
          //System.out.println(object_name);  
          //System.out.println(editor);  
          args_t = args;  
          this.setString("");  
      }  
            
      protected void closeTextBox(boolean update) {  
            if (update) canvasText = this.getString();  
            //System.out.println(canvasText);  
 
            if(object_name.equals("registScreen"))  
            {  
                if(editor.equals("regist_name"))  
                {  
                    if(args_t[3]!=""||args_t[3]!=null||args_t[4]!=""||args_t[4]!=null)  
                    {  
                        args[0] = object_name;  
                        args[1] = editor;  
                        args[2] = this.canvasText;  
                        args[3] = args_t[3];  
                        args[4] = args_t[4];  
                    }  
                    controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
                }  
                else if(editor.equals("regist_passwd"))  
                {  
                    if(args_t[2]!=""||args_t[2]!=null||args_t[4]!=""||args_t[4]!=null)  
                    {  
                        args[0] = object_name;  
                        args[1] = editor;  
                        args[2] = args_t[2];  
                        args[3] = this.canvasText;  
                        args[4] = args_t[4];  
                    }  
                    controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
                }  
                else if(editor.equals("regist_passwd_re"))  
                {  
                    if(args_t[2]!=""||args_t[2]!=null||args_t[3]!=""||args_t[3]!=null)  
                    {  
                        args[0] = object_name;  
                        args[1] = editor;  
                        args[2] = args_t[2];  
                        args[3] = args_t[3];  
                        args[4] = this.canvasText;  
                    }  
                    controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
                }  
            }  
              
           //...  
    }  
        
     private class TextBoxListener implements CommandListener  
     {   
        public void commandAction(Command command, Displayable disp)  
        {  
            if(command==okCommand)  
            {  
                closeTextBox(true);  
            }  
            else if(command==cancelCommand)  
            {  
                closeTextBox(false);  
            }  
        }  
    }  
}  

#p#

UserRegist.java

package com.token.view;  
 
import javax.microedition.lcdui.Font;  
import javax.microedition.lcdui.Graphics;  
import javax.microedition.lcdui.game.GameCanvas;  
import com.token.model.*;  
import com.token.util.*;  
import com.token.view.components.*;  
 
public class UserRegist extends GameCanvas implements Runnable {  
 
    private UIController controller;  
    private Graphics graphics;  
      
    private Font ft;  
      
    private Menu menu;  
    private Head head;  
    private BackGroud backGroud;  
      
    private UserDataRecord userRecord;  
 
    private String title;  
      
    private TextEdit textEdit_name;  
    private TextEdit textEdit_passwd;  
    private TextEdit textEdit_passwd_re;  
    private int textEdit_name_x;  
    private int textEdit_name_y;  
    private int textEdit_passwd_x;  
    private int textEdit_passwd_y;  
    private int textEdit_passwd_re_x;  
    private int textEdit_passwd_re_y;  
    private int currentlySelectedIndex = 0;  
      
    private String username;  
    private String passwd;  
    private String passwd_re;  
      
    long caretBlinkDelay = 500L;  
    long lastCaretBlink = 0;  
    private String object_name;  
    private String editor;  
    private boolean cursorBlinkOn1;  
    private boolean cursorBlinkOn2;  
    private boolean cursorBlinkOn3;  
      
    private int width;  
    private int height;  
      
    public UserRegist(UIController control)   
    {  
        super(false);  
        this.controller=control;  
        this.title = "用户注册";  
        setFullScreenMode(true);  
        graphics = getGraphics();  
          
        width = getWidth();  
        height = getHeight();  
          
        menu = new Menu(this);  
        head = new Head(this);  
        backGroud = new BackGroud(this);  
          
        userRecord = new UserDataRecord();  
          
        textEdit_name = new TextEdit(this);  
        textEdit_passwd = new TextEdit(this);  
        textEdit_passwd_re = new TextEdit(this);  
    }  
 
    public void show(Object[] args) {  
        // TODO Auto-generated method stub  
        setFullScreenMode(true);  
          
        object_name = ((String)args[0]!=null)?(String)args[0]:"";  
        editor = ((String)args[1]!=null)?(String)args[1]:"";  
        username = ((String)args[2]!=null)?(String)args[2]:"";  
        passwd = ((String)args[3]!=null)?(String)args[3]:"";  
        passwd_re = ((String)args[4]!=null)?(String)args[4]:"";  
          
        if(editor.equals("regist_name"))  
        {  
            cursorBlinkOn1 = true;  
            cursorBlinkOn2 = false;  
            cursorBlinkOn3 = false;  
            currentlySelectedIndex =0;  
        }  
        else if(editor.equals("regist_passwd"))  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn2 = true;  
            cursorBlinkOn3 = false;  
            currentlySelectedIndex =1;  
        }  
        else if(editor.equals("regist_passwd_re"))  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn2 = false;  
            cursorBlinkOn3 = true;  
            currentlySelectedIndex =2;  
        }  
          
        //System.out.println(object_name);  
        //System.out.println(editor);  
        draw();  
        redraw();  
    }  
 
    public void draw()  
    {  
        //clearScreen();  
        backGroud.drawBackGroud(this, graphics);  
        head.drawHead(this,graphics,this.title);  
        menu.drawMenu(this,graphics,"下一步","退出");  
        drawBody();  
    }  
 
    private void redraw()  
    {  
        switch(currentlySelectedIndex)  
        {  
            case 0:  
            {  
                cursorBlinkOn2 = false;  
                cursorBlinkOn3 = false;  
                editor = "regist_name";  
                break;  
            }  
            case 1:  
            {  
                cursorBlinkOn1 = false;  
                cursorBlinkOn3 = false;  
                editor = "regist_passwd";  
                break;  
            }  
            case 2:  
            {  
                cursorBlinkOn1 = false;  
                cursorBlinkOn2 = false;  
                editor = "regist_passwd_re";  
                break;  
            }  
            default:;  
        }  
          
        textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1);  
        textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2);  
        textEdit_passwd.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3);  
        textEdit_name.flushGraphics();  
    }  
 
    public void drawBody()  
    {  
        int margin =5;  
        ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_BOLD,Font.SIZE_LARGE);  
          
        String info = "用户名：\n";  
        String info_wrap1[] = StringDealMethod.format(info, width-10, ft);  
          
        graphics.setFont(ft);  
        graphics.setColor(Color.text);  
        for(int i=0; i<info_wrap1.length; i++)  
        {  
            graphics.drawString(info_wrap1[i],5, (i) * ft.getHeight()+40, Graphics.TOP|Graphics.LEFT);  
        }  
          
        textEdit_name_x = 5;  
        textEdit_name_y = info_wrap1.length * ft.getHeight()+40;  
        textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1);  
          
        info = "用户密码：\n";  
        String info_wrap2[] = StringDealMethod.format(info, width-10, ft);  
      
        graphics.setFont(ft);  
        graphics.setColor(Color.text);  
        for(int i=0; i<info_wrap2.length; i++)  
        {  
            graphics.drawString(info_wrap2[i],5, (i+info_wrap1.length) * ft.getHeight()+textEdit_name.height+margin+40, Graphics.TOP|Graphics.LEFT);  
        }  
          
        textEdit_passwd_x = 5;  
        textEdit_passwd_y = (info_wrap1.length+info_wrap2.length) * ft.getHeight()+textEdit_name.height+margin+40;  
        textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2);  
      
        info = "密码确认：\n";  
        String info_wrap3[] = StringDealMethod.format(info, width-10, ft);  
      
        graphics.setFont(ft);  
        graphics.setColor(Color.text);  
        for(int i=0; i<info_wrap3.length; i++)  
        {  
            graphics.drawString(info_wrap3[i],5, (i+info_wrap1.length+info_wrap2.length) * ft.getHeight()+textEdit_name.height+textEdit_passwd.height+2*margin+40, Graphics.TOP|Graphics.LEFT);  
        }  
          
        textEdit_passwd_re_x = 5;  
        textEdit_passwd_re_y = (info_wrap1.length+info_wrap2.length+info_wrap3.length) * ft.getHeight()+textEdit_name.height+textEdit_passwd.height+2*margin+40;  
        textEdit_passwd_re.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3);  
      
          
    }  
 
    public void clearScreen()  
    {  
        graphics.setColor(0xff,0xff,0xff);  
        graphics.fillRect(0, 0, width, height);  
    }  
 
    public void checkTimeStamp()  
    {  
        long currentTime = System.currentTimeMillis();  
        //System.out.println("1");  
        if(lastCaretBlink + caretBlinkDelay < currentTime)  
        {  
            //System.out.println("2");  
            if(editor.equals("regist_name"))  
            {  
                cursorBlinkOn1 =! cursorBlinkOn1;  
                cursorBlinkOn2 = false;  
                cursorBlinkOn3 = false;  
            }  
            else if(editor.equals("regist_passwd"))  
            {  
                cursorBlinkOn1 = false;  
                cursorBlinkOn2 =! cursorBlinkOn2;  
                cursorBlinkOn3 = false;  
            }  
            else if(editor.equals("regist_passwd_re"))  
            {  
                cursorBlinkOn1 = false;  
                cursorBlinkOn2 = false;  
                cursorBlinkOn3 =! cursorBlinkOn3;  
            }  
            lastCaretBlink = currentTime;  
        }  
    }  
 
    public void run()  
    {  
        //System.out.println("run");  
        while(true)  
        {  
            checkTimeStamp();  
              
            redraw();  
            try   
            {  
                synchronized(this)  
                {  
                    //System.out.println("3");  
                    wait(50L);  
                }             
            }  
            catch(Exception e)  
            {  
                e.printStackTrace();  
            }  
              
        }  
    }  
 
    protected void keyPressed(int keyCode)  
    {  
        switch(keyCode)  
        {  
            case KeyID.SOFT_RIGHT:  
            {  
                controller.handleEvent(UIController.EventID.EVENT_EXIT,null);  
                break;  
            }  
            case KeyID.SOFT_LEFT:  
            {  
                if(username!="" && passwd!=""&&passwd_re!="")  
                {  
                    if(passwd.equals(passwd_re))  
                    {  
                          
                          
                        userRecord.db_deleteAllRecord();  
                        if(userRecord.db_getRecord(1)==null)  
                        {  
                            UserDataItem userItem = new UserDataItem(1,(username+","+passwd).getBytes());  
                            userRecord.db_addRecord(userItem);  
                            userItem = null;  
                            System.gc();  
                        }  
                          
                        String update = "start";  
                        Object [] args = {"activeScreen", null, update};  
                        controller.handleEvent(UIController.EventID.EVENT_NEXT_ACTIVE_TOKEN_SCREEN,args);  
                    }  
                }  
                break;  
            }  
            case KeyID.KEY_EDIT:  
            case KEY_NUM0:  
            case KEY_NUM1:  
            case KEY_NUM2:  
            case KEY_NUM3:  
            case KEY_NUM4:  
            case KEY_NUM5:  
            case KEY_NUM6:  
            case KEY_NUM7:  
            case KEY_NUM8:  
            case KEY_NUM9:  
            {  
                //System.out.println(editor);  
                Object[] args = {object_name,editor,username,passwd,passwd_re};  
                controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT,args);  
                break;  
            }  
            default:;  
        }  
              
        keyCode = getGameAction(keyCode);  
        switch(keyCode)  
        {  
            case UP:  
            case LEFT:  
            {  
                currentlySelectedIndex--;  
                if(currentlySelectedIndex<0)  
                {  
                    currentlySelectedIndex=0;  
                }  
                else 
                {  
                    redraw();  
                }  
                break;  
            }  
            case DOWN:  
            case RIGHT:  
            {  
                currentlySelectedIndex++;  
                if(currentlySelectedIndex>2)  
                {  
                    currentlySelectedIndex=2;  
                }  
                else 
                {  
                    redraw();  
                }  
                  
                break;  
            }  
        }  
    }  
 
}  
 

#p#

【分析】

1 文本框的绘制(TextEdit.java)

需要传递GameCanvas、Graphics对象，实现绘图，策略是谁使用，谁传递该参数。此外需要床底文本框左上角坐标(x，y)以及控制光标闪烁的变量cursorBlinkOn。

public void drawTextBox(GameCanvas canvas, Graphics graphics, String text, int x, int y, boolean cursorBlinkOn)  
{  
    //System.out.println("draw");  
    int padding = 4;  
    int margin = 2;  
      
    ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);  
    graphics.setFont(ft);  
      
    width = 3*canvas.getWidth()/5+2*padding;  
    height = ft.getHeight()+2*padding;  
 
    graphics.setColor(Color.frame);  
    graphics.fillRect(x+1,y+1,width+margin,height+margin);  
          
    graphics.setColor(Color.frameBg);  
    graphics.drawRect(x, y,width, height);  
    graphics.setColor(Color.background);  
    graphics.fillRect(x+1, y+1,width-1,height-1);  
          
    graphics.setColor(Color.text);  
    graphics.drawString(text, x+padding, y+padding, Graphics.TOP|Graphics.LEFT);  
          
    drawCursor(graphics, x+ft.stringWidth(text)+padding, y+padding, 1, ft.getHeight(), cursorBlinkOn);  
          
    canvas.flushGraphics(x,y,width,height);  
} 

2 绘制光标(TextEdit.java)

public void drawCursor(Graphics graphics, int x, int y, int width, int height, boolean cursorBlinkOn)  
{  
    if(cursorBlinkOn)  
    {  
        ft = Font.getFont(Font.FACE_PROPORTIONAL,Font.STYLE_PLAIN,Font.SIZE_MEDIUM);  
        graphics.setFont(ft);  
        graphics.setColor(0x0,0x0,0x0);  
        graphics.drawLine(x+width,y,x+width,y+height);  
    }  
} 

3 实现光标闪烁

光标闪烁的实现需要用到线程，在UIController.java类中，需要绘制文本框的视图类，需要实现线程接口。

UIController.java

case EventID.EVENT_NEXT_USER_REGIST_SCREEN:  
case EventID.EVENT_USER_REGIST_EDIT_BACK:  
{  
            reg.show(args);  
            Thread thread = new Thread(reg);  
            thread.start();  
            midlet.setCurrent(reg);  
            break;  
} 

UserRegist.java

public void checkTimeStamp()  
{  
    long currentTime = System.currentTimeMillis();  
    //System.out.println("1");  
    if(lastCaretBlink + caretBlinkDelay < currentTime)  
    {  
        //System.out.println("2");  
        if(editor.equals("regist_name"))  
        {  
            cursorBlinkOn1 =! cursorBlinkOn1;  
            cursorBlinkOn2 = false;  
            cursorBlinkOn3 = false;  
        }  
        else if(editor.equals("regist_passwd"))  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn2 =! cursorBlinkOn2;  
            cursorBlinkOn3 = false;  
        }  
        else if(editor.equals("regist_passwd_re"))  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn2 = false;  
            cursorBlinkOn3 =! cursorBlinkOn3;  
        }  
        lastCaretBlink = currentTime;  
    }  
}  
 
public void run()  
{  
    //System.out.println("run");  
    while(true)  
    {  
        checkTimeStamp();  
          
        redraw();  
        try   
        {  
            synchronized(this)  
            {  
                //System.out.println("3");  
                wait(50L);  
            }             
        }  
        catch(Exception e)  
        {  
            e.printStackTrace();  
        }  
              
    }  
} 

4 调用高级界面TextBox子类PopUpTextBox

调用时，将调用对象名、编辑对象名、以及编辑框参数传递给PopUpTextBox对象(一定要有，目的是保存编辑框的值，否则多次调用返回时，不同编辑框的值被刷新为空了)

UserRegist.java(KeyPressed)

case KeyID.KEY_EDIT:  
case KEY_NUM0:  
case KEY_NUM1:  
case KEY_NUM2:  
case KEY_NUM3:  
case KEY_NUM4:  
case KEY_NUM5:  
case KEY_NUM6:  
case KEY_NUM7:  
case KEY_NUM8:  
case KEY_NUM9:  
{  
    //System.out.println(editor);  
    Object[] args = {object_name,editor,username,passwd,passwd_re};  
    controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT,args);  
    break;  
} 

UIController.java

case EventID.EVENT_USER_REGIST_EDIT:  
{  
     textBox.init(args);  
         midlet.setCurrent(textBox);  
     break;  
} 

5 PopUpTextBox参数的接收

public void init(Object[] args)  
{  
     object_name = ((String)args[0]!=null)?(String)args[0]:"";  
     editor = ((String)args[1]!=null)?(String)args[1]:"";  
     //System.out.println(object_name);  
     //System.out.println(editor);  
     args_t = args;  
     this.setString("");  
} 

6 PopUpTextBox返回输入法输入的值

if (update) canvasText = this.getString(); 

#p#

7 PopUpTextBox输入值处理

依据调用的对象，以及编辑对象，对输入的值进行处理，传递给父对象编辑框

if(object_name.equals("registScreen"))  
{  
        if(editor.equals("regist_name"))  
        {  
                if(args_t[3]!=""||args_t[3]!=null||args_t[4]!=""||args_t[4]!=null)  
                {  
                    args[0] = object_name;  
                    args[1] = editor;  
                    args[2] = this.canvasText;  
                    args[3] = args_t[3];  
                    args[4] = args_t[4];  
                }  
                controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
    }  
    else if(editor.equals("regist_passwd"))  
    {  
                if(args_t[2]!=""||args_t[2]!=null||args_t[4]!=""||args_t[4]!=null)  
                {  
                    args[0] = object_name;  
                    args[1] = editor;  
                    args[2] = args_t[2];  
                    args[3] = this.canvasText;  
                    args[4] = args_t[4];  
                }  
                controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
    }  
    else if(editor.equals("regist_passwd_re"))  
    {  
                if(args_t[2]!=""||args_t[2]!=null||args_t[3]!=""||args_t[3]!=null)  
                {  
                    args[0] = object_name;  
                    args[1] = editor;  
                    args[2] = args_t[2];  
                    args[3] = args_t[3];  
                    args[4] = this.canvasText;  
                }  
                controller.handleEvent(UIController.EventID.EVENT_USER_REGIST_EDIT_BACK,args);  
    }  
} 

8 输入值的显示

(1) 新建对象

private TextEdit textEdit_name;  
textEdit_name = new TextEdit(this);  

(2) 接受输入的参数

object_name = ((String)args[0]!=null)?(String)args[0]:"";  
editor = ((String)args[1]!=null)?(String)args[1]:"";  
username = ((String)args[2]!=null)?(String)args[2]:"";  
passwd = ((String)args[3]!=null)?(String)args[3]:"";  
passwd_re = ((String)args[4]!=null)?(String)args[4]:""; 

(3) 光标控制，定位到编辑对象，控制编辑对象的光标闪烁(run方法)

private void redraw()  
{  
    switch(currentlySelectedIndex)  
    {  
        case 0:  
        {  
            cursorBlinkOn2 = false;  
            cursorBlinkOn3 = false;  
            editor = "regist_name";  
            break;  
        }  
        case 1:  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn3 = false;  
            editor = "regist_passwd";  
            break;  
        }  
        case 2:  
        {  
            cursorBlinkOn1 = false;  
            cursorBlinkOn2 = false;  
            editor = "regist_passwd_re";  
            break;  
        }  
        default:;  
    }  
//...  
 
} 

(4) 编辑框的绘制

private void redraw()  
{  
    ...       
    textEdit_name.drawTextBox(this, graphics, username, textEdit_name_x, textEdit_name_y, cursorBlinkOn1);  
    textEdit_passwd.drawTextBox(this, graphics, passwd, textEdit_passwd_x, textEdit_passwd_y, cursorBlinkOn2);  
    textEdit_passwd.drawTextBox(this, graphics, passwd_re, textEdit_passwd_re_x, textEdit_passwd_re_y, cursorBlinkOn3);  
    textEdit_name.flushGraphics();  
}  

实现的效果如图1所示：

图1 编辑框效果

【参考文献】

(1) http://www.developer.nokia.com/Community/Wiki/Custom_Text_Input_in_Java_ME

(2) j2me跳转到高级界面获得输入法

(3) http://www.iteye.com/topic/394113

(4) http://topic.csdn.net/t/20060906/09/5001597.html

原文链接：http://blog.csdn.net/tandesir/article/details/7544795

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