addrecorddemo.java

基于j2me的手机应用程序-电话本

/*
 * 最基本的添加和读取操作
 */
package PhoneBook;

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

public class AddRecordDemo extends MIDlet implements CommandListener{

	private Display myDisplay;
	private Command exitCommand;
	private Command addCommand;
	private TextBox tb;
	private RecordStore rs;
	public AddRecordDemo() {
	    rs = null;
		exitCommand = new Command("Exit", Command.EXIT, 1);
		addCommand = new Command("Add", Command.SCREEN, 1);
		myDisplay = Display.getDisplay(this);
		tb = new TextBox("添加记录", "please add data", 100, 0);
		tb.addCommand(exitCommand);
		tb.addCommand(addCommand);
		tb.setCommandListener(this);
		myDisplay.setCurrent(tb);
	}	
	protected void startApp(){		
		try{
			rs = RecordStore.openRecordStore("Record1",true);
		}catch(Exception e){			
			rs = null;
		}		
		
	}
	protected void pauseApp() {	
	}

	protected void destroyApp(boolean arg0){		
		try{
			rs.closeRecordStore();
			}catch(Exception e){				
			}
	}
	public void commandAction(Command c, Displayable d) {
		if (c == exitCommand) {			
			destroyApp(false);
			notifyDestroyed();
		}
		if (c == addCommand) {			
			if (rs != null) {
				byte[] data = tb.getString().getBytes();
				int i=0;
				try {
					 i = rs.addRecord(data, 0, data.length);
				} catch (RecordStoreException e) {
				    System.out.println(e);
					e.printStackTrace();
				}				
				byte[] getdata = new byte[data.length];
				try {
					rs.getRecord(i, getdata, 0);
					String str = new String(getdata );		
					System.out.println(str);
					tb.setString("The record data is :" + str );

				} catch (RecordStoreException e) {
			    }
						
			}
		}

	}
	 		
}