请高手给看一下,为什么我的rs总是存不下来呢?
/*
* 创建日期 2007-5-17
*
* TODO 要更改此生成的文件的模板，请转至
* 窗口 － 首选项 － Java － 代码样式 － 代码模板
*/
package example;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
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.StringItem;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.rms.RecordStore;
import javax.microedition.rms.RecordStoreNotFoundException;
/**
* @author Administrator
*
* TODO 要更改此生成的类型注释的模板，请转至
* 窗口 － 首选项 － Java － 代码样式 － 代码模板
*/
public class Rr extends MIDlet implements CommandListener {
private Command exitCommand;
private Command setCommand;
private Display display;
private Form aForm;
private TextField tf;
//private StringItem si;
private Alert al;
private String ss;
private int a = 333;
private Command backCommand;
private int start = 0;
String s[];
public Rr() {
super();
display = Display.getDisplay(this);
exitCommand = new Command( "离开 ",Command.SCREEN,1);
aForm = new Form( "dsdf ");
tf = new TextField(null,null,256,TextField.ANY);
//si = new StringItem(null, "请输入: ");
setCommand = new Command( "保存 ",Command.SCREEN,1);
//aForm.append(si);
aForm.append(tf);
aForm.addCommand(setCommand);
aForm.addCommand(exitCommand);
aForm.setCommandListener(this);
TextBox aTextBox;
backCommand = new Command( "返回 ",Command.BACK,1);
// TODO 自动生成构造函数存根
}
protected void startApp() throws MIDletStateChangeException {
// TODO 自动生成方法存根
//TextBox aTextBox = new TextBox( "主画面 ",null,256,TextField.ANY);
display.setCurrent(aForm);
}
protected void pauseApp() {
// TODO 自动生成方法存根
}
protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO 自动生成方法存根
}
public boolean existing(String recordStoreName)
{
boolean existingOrNot = true;
RecordStore rs = null;
if(recordStoreName.length() > 32)
return false;
try
{
rs = RecordStore.openRecordStore(recordStoreName,false);
}
catch(RecordStoreNotFoundException e)
{
existingOrNot = false;
}
catch(Exception e)
{}
finally
{
try
{
rs.closeRecordStore();
}
catch(Exception e)
{}
}
return existingOrNot;
}
public void commandAction(Command arg0, Displayable arg1) {
// TODO 自动生成方法存根
if(arg0 == setCommand)
{
saveRecord();
/*
ss = tf.getString();
al = new Alert( "显示 ",ss,null,AlertType.CONFIRMATION);
al.setTimeout(Alert.FOREVER);
display.setCurrent(al);
*/
}
//notifyDestroyed();
if(arg0 == exitCommand)
{
getRec();
}
if(arg0 == backCommand)
display.setCurrent(aForm);
}
public void saveRecord()
{
RecordStore rs = null;
byte[] buffer = null;
boolean existingOrNot = false;
boolean OK = true;
existingOrNot = existing( "memo ");
if(existingOrNot)
{
try
{
rs = RecordStore.openRecordStore( "memo ",false);
}
catch(Exception e)
{
OK = false;
}
finally
{
if(OK)
// tf.setString( "memo已存在并且已打开 ");
a = 111;
else
// tf.setString( "memo已存在但无法打开 ");
a = 222;
}
}
[解决办法]
rms是缓冲处理的，你只有正常的退出MIDlet,rms才会保存到硬盘上
注意在你退出MIDlet的代码处，添加
destroyApp(false);
notifyDestroyed();
[解决办法]
可能是模拟器的问题,最好在真机上测试.
saltedfish
[解决办法]
try
{
rs = RecordStore.openRecordStore(recordStoreName,false);
~~~~~`这里应该写true吧，不然这个rs 不会被创建，你怎么存数据呢？
}
catch(RecordStoreNotFoundException e)
{
existingOrNot = false;
}
