addressbookmidlet.java

电话薄实例

import   javax.microedition.lcdui.*;   
import   javax.microedition.midlet.*;   
import   javax.microedition.rms.*;   

import   java.io.*;   

public   class   AddressBookMIDlet   extends   MIDlet   implements   CommandListener{   
	private   Display   display;   
	private   String   current   =   null;     
	int[]     recordes;   
	String   dbname   =   "dressbook";   
	Form   addform   =   new   Form("增加资料");   
	TextField   tfname   =   new   TextField("姓名:","",20,TextField.ANY);   
	TextField   tftel   =   new   TextField("电话:","",20,TextField.PHONENUMBER);   

	public   AddressBookMIDlet(){   
		display   =   Display.getDisplay(this);   
	}   
	public   void   startApp(){   
		//必须先初始化，不能放到addForm中再初始化。   
		Command   add   =   new   Command("确定",Command.OK,1);   
		Command   back=   new   Command("返回",Command.BACK,3);   
		addform.append(tfname);   
		addform.append(tftel);   
		addform.addCommand(add);   
		addform.addCommand(back);   
		addform.setCommandListener(this);   
		mainForm();   
	}   
	public   void   pauseApp(){}   
	public   void   destroyApp(boolean   unconditional){}   
	public   void   commandAction(Command   c,Displayable   d){   
		if(c   ==   List.SELECT_COMMAND   &&   current.equals("mainForm")){   
			List   temp   =   (List)   d;   
			switch   (temp.getSelectedIndex()){   
			case   0:   
				searchData();   
				break;   
			case   1:   
				addForm();   
				break;   
			case   2:   
				delForm();   
				break;   
			}   
		}   
		if(current.equals("addForm")){   
			if   (c.getLabel().equals("确定"))   addData();   
			if   (c.getLabel().equals("返回"))   mainForm();   
		}   
		if(current.equals("listallForm")){   
			if(c.getLabel().equals("返回"))   mainForm();   
		}   

		if(current.equals("delForm")){   
			if(c.getLabel().equals("返回"))   mainForm();   
			if(c.getLabel().equals("删除"))   {   
				List   temp   =   (List)   d;   
				deleteData(temp.getSelectedIndex());   
				delForm();   
			}   
		}   
	}   

	//主操作界面   
	public   void   mainForm(){   
		current   =   "mainForm";   
		List   l   =   new   List("我的电话本",Choice.IMPLICIT);   
		l.append("查找",null);   
		l.append("增加",null);   
		l.append("删除",null);   
		l.append("分组信息",null);   
		l.append("存储状况",null);   
		l.setCommandListener(this);   
		display.setCurrent(l);   
	}   
	//增加电话号码界面   
	public   void   addForm(){   
		current   =   "addForm";   
		display.setCurrent(addform);   
	}   
	//删除电话界面   
	public   void   delForm(){   
		current   =   "delForm";   
		List   flist             =   new   List("删除电话：",Choice.EXCLUSIVE);   
		Command   confirm   =   new   Command("删除",Command.SCREEN,1);   
		Command   back         =   new   Command("返回",Command.BACK,2);   
		flist.addCommand(confirm);   
		flist.addCommand(back);   
		flist.setCommandListener(this);   
		listData(flist);   
	}   
	//查找数据   
	public   void   searchData(){   
		List   flist             =   new   List("电话列表：",Choice.EXCLUSIVE);   
		current   =   "listallForm";   
		Command   back   =   new   Command("返回",Command.SCREEN,1);   
		flist.addCommand(back);   
		flist.setCommandListener(this);   
		listData(flist);   
	}   
	//增加数据   
	public   void   addData(){   
		//如果输入为空，则提示出错！   
		if(tfname.getString().trim().equals("")||tftel.getString().equals("")){   
			Alert   al   =   new   Alert("Input   null");   
			al.setType(AlertType.ERROR);   
			al.setString("输入不能为空！");   
			al.setTimeout(1500);   
			display.setCurrent(al);   
			return;   
		}   
		outinData   data   =   new   outinData();   
		data.name             =   tfname.getString();   
		data.tel       =   tftel.getString();   
		RecordStore   rs   =   openRs(dbname);   
		byte[]   temp       =   data.encode();   
		if(rs==null){   
			System.out.println("When   Add   Data,open   Rs   error!");   
		}else{   
			try{   
				rs.addRecord(temp,0,temp.length);   
				rs.closeRecordStore();   
				//deleteRs(dbname);   
				Alert   al   =   new   Alert("Add   Record");   
				al.setType(AlertType.INFO);   
				al.setString("添加成功！");   
				al.setTimeout(1500);   
				display.setCurrent(al);   
			}catch(Exception   e){System.out.println("Add   data   error");}   
		}   
	}   
	//电话列表   
	public   void   listData(List   flist){   
		RecordStore   rs   =   openRs(dbname);   
		if(rs==null){   
			System.out.println("When   list   Data,openRs   error!");   
		}else{   
			try{   
				RecordEnumeration   re   =   rs.enumerateRecords(null,null,false);   
				outinData   data               =   new   outinData();   
				int   totalrecords   =   re.numRecords();   
				if(totalrecords==0){   
					flist.append("没有资料！",null);   
					display.setCurrent(flist);   
					return;   
				}   
				//把recordid读入数组   
				recordes   =   new   int[totalrecords];   
				for(int   i   =   0;i<totalrecords;i++){   
					int   j   =   re.nextRecordId();   
					recordes[i]   =   j;   
					byte[]   temp   =   rs.getRecord(j);   
					data.decode(temp);   
					flist.append(data.name+"     "+data.tel,null);   
				}   
				display.setCurrent(flist);   
			}catch(Exception   e){System.out.println("When   list   Data,List   error");}   
		}   
	}   
	//删除某条记录,   int   i为List对应的被选定的Item   
	public   void   deleteData(int   i){   
		RecordStore   rs   =   openRs(dbname);   
		System.out.println(i);   
		int   id   =   recordes[i];   
		System.out.println("id:"+id);   
		try{   
			rs.deleteRecord(id);   
		}catch(Exception   e){   
			System.out.println("delete   Record   error:"+e.getMessage());   
			return;   
		}   
		Alert   al   =   new   Alert("delete   data");   
		al.setType(AlertType.ERROR);   
		al.setString("id"+id+"   is   deleted!");   
		al.setTimeout(1500);   
		display.setCurrent(al);   
	}   
	//打开Rs   
	public   RecordStore   openRs(String   rsname){   
		RecordStore   rs   =   null;   
		try{   
			rs   =   RecordStore.openRecordStore(rsname,true);   
		}catch(Exception   e){   
			System.out.println("open   Rs   error:"+e.getMessage());   
			return   null;   
		}   
		return   rs;   
	}   
	//删除Rs   
	public   boolean   deleteRs(String   rsname){   
		if(rsname.length()>32){   
			return   false;   
		}   
		try{   
			RecordStore.deleteRecordStore(rsname);   
		}catch(Exception   e){   
			System.out.println("deleteRs   error:"+e.getMessage());   
			return   false;   
		}   
		return   true;   
	}   
}   
//按照rms要求的格式读出和写入数据   
class   outinData   {   
	String   name   =   null;   
	String   tel     =   null;   
	public   void   decode(byte[]   data){   
		try{   
			ByteArrayInputStream   bis   =   new   ByteArrayInputStream(data);   
			DataInputStream   dis             =   new   DataInputStream(bis);   
			name   =   dis.readUTF();   
			tel     =   dis.readUTF();   
			bis.close();   
			dis.close();   
		}catch(Exception   e){System.out.println("decode   error:"+e.getMessage());}   
	}   
	public   byte[]   encode(){   
		byte[]   result   =   null;   
		try{   
			ByteArrayOutputStream   bos   =   new   ByteArrayOutputStream();   
			DataOutputStream   dos   =   new   DataOutputStream(bos);   
			dos.writeUTF(name);   
			dos.writeUTF(tel);   
			result   =   bos.toByteArray();   
			bos.close();   
			dos.close();   
		}catch(Exception   e){   
			System.out.println("encode   error:"+e.getMessage());   
			return   null;   
		}   
		return   result;   
	}   
}