javaME 学习之-简单通讯录

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概述

界面说明: 欢迎界面--包含退出按钮   电话本按钮欢迎说明
                 主界面--显示通讯录列表    包含返回(回到欢迎界面) 按钮    删除按钮(对列表中的记录删除) 添加按钮(跳转到添加界面)
               添加界面--有姓名、号码文本框   保存和返回按钮

代码说明：

1.欢迎界面 WelcomeCanvas.class

Code
1

package org;
2

import javax.microedition.lcdui.Canvas;
4

import javax.microedition.lcdui.Command;
5

import javax.microedition.lcdui.CommandListener;
6

import javax.microedition.lcdui.Displayable;
7

import javax.microedition.lcdui.Font;
8

import javax.microedition.lcdui.Graphics;
9

public class WelcomeCanvas extends Canvas implements CommandListener

{
11

private Command cmdExit = new Command("退出", Command.EXIT, 1);
13

private Command cmdPhone = new Command("电话本", Command.SCREEN, 1);
14

private MainMIDlet mid;
15

protected void paint(Graphics g)

{
17

g.setColor(255, 0, 0);
19

g.setFont(Font.getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD,
20

Font.SIZE_LARGE));
21

String welcomeString = "欢迎使用";
22

int fontStringWidth = g.getFont().stringWidth(welcomeString);// 字长
23

int fontStringHeight = g.getFont().getHeight();// 高度
24

// 显示屏幕正中央
25

g.drawString(welcomeString, this.getWidth() / 2 - fontStringWidth / 2,
26

this.getHeight() / 2 - fontStringHeight / 2, Graphics.LEFT
27

| Graphics.TOP);
28

}
29

public WelcomeCanvas(MainMIDlet midDlet)

{
31

this.addCommand(cmdExit);
32

this.addCommand(cmdPhone);
33

this.setCommandListener(this);
34

this.mid = midDlet;
35

}
36

public void commandAction(Command c, Displayable d)

{
38

if (c == cmdExit)

{
40

mid.notifyDestroyed();
41

}
42

if (c == cmdPhone)

{
43

mid.changeCurrentUI("phoneList");
44

}
45

}
46

}
48

2.通讯列表 PhoneList.class

Code
1

package org;
2

import javax.microedition.lcdui.Command;
4

import javax.microedition.lcdui.CommandListener;
5

import javax.microedition.lcdui.Displayable;
6

import javax.microedition.lcdui.List;
7

import javax.microedition.rms.RecordStoreException;
8

public class PhoneList extends List implements CommandListener

{
10

private Command cmdBack = new Command("返回", Command.BACK, 1);
12

private Command cmdAdd = new Command("添加", Command.SCREEN, 1);
13

private Command cmdDelete = new Command("删除", Command.SCREEN, 2);
14

private MainMIDlet mid;
15

public PhoneList(MainMIDlet mid)

{
17

super("电话本", List.IMPLICIT);
18

this.addCommand(cmdBack);
19

this.addCommand(cmdAdd);
20

this.addCommand(cmdDelete);
21

this.setCommandListener(this);
22

this.mid = mid;
23

}
24

public void commandAction(Command c, Displayable d)

{
26

//返回
28

if (c == cmdBack)

{
29

mid.changeCurrentUI("welcome");
30

}
31

//添加
32

if (c == cmdAdd)

{
33

mid.changeCurrentUI("PhoneAddForm");
34

}
35

//删除
36

if (c == cmdDelete)

{
37

try

{
38

mid.rStoreOperate.deleteRecord(this.getString(this
39

.getSelectedIndex()));
40

mid.LoadData();
42

} catch (RecordStoreException e)

{
43

// TODO Auto-generated catch block
44

e.printStackTrace();
45

}
46

}
47

}
49

}
50

3.添加界面 PhoneNumberAddForm.class

Code
1

package org;
2

import javax.microedition.lcdui.Command;
4

import javax.microedition.lcdui.CommandListener;
5

import javax.microedition.lcdui.Displayable;
6

import javax.microedition.lcdui.Form;
7

import javax.microedition.lcdui.StringItem;
8

import javax.microedition.lcdui.TextField;
9

import javax.microedition.rms.RecordStoreException;
10

public class PhoneNumberAddForm extends Form implements CommandListener

{
12

private Command cmdAddNumber = new Command("添加号码", Command.OK, 2);
14

private Command cmdBack = new Command("返回", Command.BACK, 3);
16

private TextField txtName = new TextField("姓名", "", 50, TextField.ANY);
18

private TextField txtNumber = new TextField("号码", "", 50, TextField.NUMERIC);
20

private StringItem alertInfo = new StringItem("", "");
22

MainMIDlet midDlet;
24

public PhoneNumberAddForm(MainMIDlet mid)

{
26

super("添加电话号码");
27

this.addCommand(cmdAddNumber);
28

this.addCommand(cmdBack);
29

this.append(txtName);
30

this.append(txtNumber);
31

this.append(alertInfo);
32

this.setCommandListener(this);
33

this.midDlet = mid;
34

}
36

public void commandAction(Command c, Displayable d)

{
38

if (c == cmdBack)

{
40

midDlet.changeCurrentUI("phoneList");
41

}
42

if (c == cmdAddNumber)

{
43

try

{
44

midDlet.rStoreOperate.addRecord(txtName.getString() + "-"
46

+ txtNumber.getString());
47

alertInfo.setText("添加成功！");
49

txtName.setString("");
50

txtNumber.setString("");
51

} catch (RecordStoreException e)

{
53

e.printStackTrace();
54

alertInfo.setText("添加失败！");
55

}
56

}
57

}
58

}
59

4.主界面MIDlet

Code
1

package org;
2

import java.util.Enumeration;
4

import java.util.Vector;
5

import javax.microedition.lcdui.Display;
7

import javax.microedition.midlet.MIDlet;
8

import javax.microedition.midlet.MIDletStateChangeException;
9

import javax.microedition.rms.RecordStoreException;
10

public class MainMIDlet extends MIDlet

{
12

private Display display;
14

WelcomeCanvas wc = new WelcomeCanvas(this);
15

PhoneList pList = new PhoneList(this);
16

PhoneNumberAddForm phoneNumberAddForm = new PhoneNumberAddForm(this);
17

public RecordStoreOperate rStoreOperate = new RecordStoreOperate("number");
18

public MainMIDlet()

{
20

display = Display.getDisplay(this);
21

}
22

protected void destroyApp(boolean unconditional)
24

throws MIDletStateChangeException

{
25

}
27

protected void pauseApp()

{
29

}
31

// /加载通讯列表
33

public void LoadData()

{
34

try

{
35

pList.deleteAll();
36

Vector vector = rStoreOperate.loadData();
37

Enumeration en = vector.elements();
38

while (en.hasMoreElements())

{
39

pList.append(en.nextElement().toString(), null);
40

}
41

} catch (RecordStoreException e)

{
42

e.printStackTrace();
43

}
44

}
46

protected void startApp() throws MIDletStateChangeException

{
48

changeCurrentUI("welcome");
49

}
50

public void changeCurrentUI(String name)

{
52

if (name.equals("phoneList"))

{
53

display.setCurrent(pList);
54

LoadData();
55

}
56

if (name.equals("welcome"))

{
57

display.setCurrent(wc);
58

}
59

if (name == "PhoneAddForm")

{
60

display.setCurrent(phoneNumberAddForm);
61

}
63

}
64

}
66

5.RMS操作

Code
1

package org;
2

import java.util.Vector;
4

import javax.microedition.rms.RecordEnumeration;
6

import javax.microedition.rms.RecordFilter;
7

import javax.microedition.rms.RecordStore;
8

import javax.microedition.rms.RecordStoreException;
9

import javax.microedition.rms.RecordStoreNotOpenException;
10

public class RecordStoreOperate implements RecordFilter

{
12

private RecordStore rStore = null;
14

public RecordStoreOperate(String rsName)

{
16

try

{
18

rStore = RecordStore.openRecordStore(rsName, true);
19

} catch (RecordStoreException e)

{
20

e.printStackTrace();
21

}
22

}
23

public Vector loadData() throws RecordStoreNotOpenException,
25

RecordStoreException

{
26

Vector v = new Vector();
28

RecordEnumeration re = rStore.enumerateRecords(this, null, false);
30

while (re.hasNextElement())

{
31

String str = new String(re.nextRecord());
32

v.addElement(str);
33

}
34

return v;
35

}
36

// /删除记录 by ID
38

public void deleteRecord(int id) throws RecordStoreException

{
39

rStore.deleteRecord(id);
40

}
41

/** *//**
43

* 删除记录注意点删除记录后该记录的recordId 还是保存着的所以删除不能把记录的numRecord当做RecordId来用
44

* 我这里采取置为空字符窜" " 而且长度要大于0 如果为"" 读取的时候就会当做NULL 而且此处也并非真正意思上的删除
45

* 删除记录也不是真正意义上的删除只是把值改成" " 读取过滤
46

* **/
47

public void deleteRecord(String record) throws RecordStoreException

{
49

int numRecords = rStore.getNumRecords();
51

for (int i = 0; i < numRecords; i++)

{
53

byte[] b = rStore.getRecord(i + 1);
54

if (new String(b).equals(record))

{
56

rStore.setRecord(i + 1, " ".getBytes(), 0, 1);
58

}
59

}
60

}
62

// 添加记录
64

public void addRecord(String rsString) throws RecordStoreException

{
65

byte[] b = rsString.getBytes();
66

rStore.addRecord(b, 0, b.length);
67

}
68

/** *//**过滤 " " 意为" "是已被删除
71

**返回true 记录集中包含该条件的记录 flase返回不符此条件的记录
72

**/
73

public boolean matches(byte[] value)

{
74

return !new String(value).equals(" ");
76

}
77

}
78

转载于:https://www.cnblogs.com/zhangqifeng/archive/2009/09/13/1565878.html

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本文分类：java
浏览次数：63 次浏览
发布日期：2023-09-20 07:05:24
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