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Java进阶篇:RMS从入门到精通系列(1)(2)
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中华网科技 http://tech.china.com
2005-09-21 11:45:41
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import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.
MIDletStateChangeException;
import javax.microedition.
rms.RecordStoreException;
public class RMSAnalyzer extends MIDlet
{
private Display display;
private CounterCanvas counterCanvas;
private Alert alert;
protected void startApp()
throws MIDletStateChangeException
{
display =
Display.getDisplay(RMSAnalyzer.this);
alert = new Alert("错误提示");
try
{
String interval =
this.getAppProperty("INTER");
int t = Integer.parseInt(interval);
counterCanvas =
new CounterCanvas(t, 1, this);
}
catch (RecordStoreException e)
{
this.showAlertError(e.getMessage());
}
display.setCurrent(counterCanvas);
}
public Display getDisplay()
{
return display;
}
protected void pauseApp()
{
}
protected void destroyApp
(boolean arg0) throws
MIDletStateChangeException
{
}
public void showAlertError(String message)
{
alert.setString(message);
alert.setType(AlertType.ERROR);
alert.setTimeout(3000);
display.setCurrent(alert);
}
}
import java.util.Timer;
import java.util.TimerTask;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.
MIDletStateChangeException;
import javax.microedition.rms.*;
public class CounterCanvas extends
Canvas implements CommandListener
{
private RMSModel model;
private RMSAnalyzer RMSanalyzer;
private int interTime;
private int counter;
private boolean go = true;
public static Command backCommand =
new Command("退出", Command.EXIT, 3);
public static final int INC = 1;
public final Timer timer = new Timer();
public CounterCanvas(int interTime,
int base, RMSAnalyzer rmsa)
throws RecordStoreException
{
this.interTime = interTime;
this.counter = base;
this.RMSanalyzer = rmsa;
model = new RMSModel(base, RMSanalyzer);
this.addCommand(backCommand);
this.setCommandListener(this);
TimerTask timerTask = new TimerTask()
{
public void run()
{
try
{
model.writeRecord(INC);
counter++;
} catch (RecordStoreFullException e)
{
go = false;
model.deleteRMS();
timer.cancel();
} catch (RecordStoreException e)
{
model.deleteRMS();
RMSanalyzer.showAlertError(e.getMessage());
timer.cancel();
}
repaint();
}
};
timer.schedule(timerTask,
1000, interTime);
}
public void setCounter(int counter)
{
this.counter = counter;
}
public void setInterTime(int interTime)
{
this.interTime = interTime;
}
protected void paint(Graphics arg0)
{
int SCREEN_WIDTH = this.getWidth();
int SCREEN_HEIGHT = this.getHeight();
arg0.drawRect(SCREEN_WIDTH / 10,
SCREEN_HEIGHT / 2,
SCREEN_WIDTH * 4 / 5, 10);
if(RMSanalyzer.getDisplay().isColor())
{
arg0.setColor(128, 128, 255);
}
arg0.fillRect(SCREEN_WIDTH / 10,
SCREEN_HEIGHT / 2, counter, 10);
if (!go)
arg0.drawString("最大值：
" + counter+"K字节", 0, 0,
Graphics.TOP
| Graphics.LEFT);
}
public void commandAction
(Command arg0, Displayable arg1)
{
if (arg0 == backCommand)
{
try
{
model.deleteRMS();
RMSanalyzer.destroyApp(false);
RMSanalyzer.notifyDestroyed();
} catch (MIDletStateChangeException e)
{
}
}
}
}
import javax.microedition.rms.*;
public class RMSModel
{
public static final int K = 1024;
private RecordStore rs;
private int baseCount;
private RMSAnalyzer RMSanalyzer;
public static final
String name = "test";
public RMSModel(int baseCount,
RMSAnalyzer rmsa)
throws RecordStoreException
{
this.baseCount = baseCount;
this.RMSanalyzer = rmsa;
if (rs == null)
{
rs = RecordStore.
openRecordStore(name, true);
writeRecord(baseCount);
}
}
public void writeRecord(int count)
throws RecordStoreException
{
byte[] data = new byte[count * K];
for (int i = 0; i < count; i++)
{
data[i] = 1;
}
rs.addRecord(data, 0, count * K);
}
public void deleteRMS()
{
try
{
rs.closeRecordStore();
RecordStore.deleteRecordStore(name);
} catch (RecordStoreException e)
{
RMSanalyzer.showAlertError
(e.getMessage());
}
}
}
RMSAnalyzer.jad
MIDlet-Jar-Size: 5293
MIDlet-1: RMSAnalyzer,,RMSAnalyzer
MIDlet-Jar-URL: RMSAnalyzer.jar
MicroEdition-Configuration: CLDC-1.0
MIDlet-Version: 1.0.0
MIDlet-Name: RMSAnalyzer
MIDlet-Data-Size: 8192
MIDlet-Vendor: Midlet Suite Vendor
MicroEdition-Profile: MIDP-1.0
INTER: 100
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