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August 10, 2018 21:59
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Debugging BlackBerry Applications: A Simple Debug Console Class
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/** | |
Debugging a BlackBerry application can be done on a simulator, | |
when the bug permits that sort of thing, or on the device itself. | |
If you’re in a situation where you must debug your code while it | |
runs on a real device, your can sometimes take advantage of the | |
tethering debugger provided by the JDE; connecting the device to | |
the PC via a USB cable, and then hoping everything is stable | |
enough for you to catch a breakpoint and find your bug. | |
This is all fine and good, but there are times when you | |
find yourself in a situation where neither of these | |
techniques gives good results. | |
At Antair, during development of our BlackBerry applications, | |
we often include a debug console in the dev builds of our apps. | |
With the debug console, all debug output hits the output | |
screen when the dev build is running in the simulator, | |
and when the dev build runs on a physical test device, | |
the debug output is automatically persisted and is | |
available to view on a dedicated screen that can be | |
pulled up via a menu option or button. | |
The code below is a stripped-down version of the | |
debug console we use at our company. | |
Using the console is easy. Include the code in your | |
project, fill out the PERSISTENCE_GUID for your application, | |
set the TAGID string to identify your application name in the | |
debug logs, and when you want to output a debug statement, | |
simply call Debug.print(“Something happened here…“); | |
Each line of the debug output, both in the output window when | |
running in a simulator, and in the debug console screen when | |
viewed on a device, will contain your debug message, the | |
thread number on which the call was made (useful for thread/ui debugging), | |
and the date/time of the log statement, with a millisecond | |
timestamp for performance profiling. | |
To view the debug console on a real device, simple put in a | |
call to pushScreen(new AntairLogScreen()). The screen has a | |
built-in menu item to clear the persisted log messages, and | |
will dismiss itself like a regular application screen. | |
If you’re running the RIM compiler preprocessor to switch | |
between development, QA, and production builds, you can | |
simply put in a call to set Debug.ENABLED = false for | |
everything but the development builds, and the debug console | |
will be there when you need to debug and go away quietly | |
when you don’t need it. | |
- Andrey Butov ( andreybutov.com ) | |
**/ | |
// ----------------------------------------------------------------------------- | |
// | |
// Antair Debug Log (for the BlackBerry API) | |
// Copyright (c) 2005 - 2010, Antair Corporation. All Rights Reserved. | |
// http://www.antair.com | |
// | |
// BlackBerry is a registered trademark of Research in Motion. | |
// | |
// ----------------------------------------------------------------------------- | |
package com.antair.examples.debug; | |
import net.rim.device.api.i18n.SimpleDateFormat; | |
import java.util.Date; | |
import net.rim.device.api.collection.util.BigVector; | |
import net.rim.device.api.system.PersistentObject; | |
import net.rim.device.api.system.PersistentStore; | |
import net.rim.device.api.ui.MenuItem; | |
import net.rim.device.api.ui.component.Menu; | |
import net.rim.device.api.ui.component.RichTextField; | |
import net.rim.device.api.ui.container.MainScreen; | |
import net.rim.device.api.util.Persistable; | |
final class Debug implements Persistable | |
{ | |
final static boolean ENABLED = true; | |
final static String TAGID = "MY_PROJECT"; | |
final static long PERSISTENCE_GUID = /* YOUR OWN PERSISTENCE GUID */; | |
private BigVector _messages = new BigVector(); | |
static String print(String str) | |
{ | |
if ( Debug.ENABLED ) | |
{ | |
StringBuffer sb = new StringBuffer(); | |
sb.append(TAGID); | |
sb.append("\n"); | |
sb.append(Thread.currentThread().toString()); | |
sb.append("\n"); | |
sb.append(new SimpleDateFormat("MM/dd/yy HH:mm:ss:SSS").format(new Date())); | |
sb.append("\n"); | |
sb.append(str); sb.append("\n"); | |
str = sb.toString(); | |
System.out.println(str); | |
System.out.flush(); | |
Debug d = load(); | |
d._messages.addElement(str); | |
save(d); | |
} | |
return str; | |
} | |
static BigVector getPersistedMessages() | |
{ | |
return load()._messages; | |
} | |
static void clearPersistedMessages() | |
{ | |
save(new Debug()); | |
} | |
private static Debug load() | |
{ | |
Debug d = null; | |
try | |
{ | |
PersistentObject po = PersistentStore.getPersistentObject(Debug.PERSISTENCE_GUID); | |
synchronized(po) | |
{ | |
Object obj = po.getContents(); | |
d = (obj == null) ? new Debug() : (Debug)obj; | |
} | |
} | |
catch ( Exception e ) | |
{ | |
d = new Debug(); | |
} | |
return d; | |
} | |
private static void save(Debug d) | |
{ | |
try | |
{ | |
PersistentObject po = PersistentStore.getPersistentObject(Debug.PERSISTENCE_GUID); | |
synchronized(po) | |
{ | |
po.setContents(d); | |
po.commit(); | |
} | |
} | |
catch ( Exception e ) | |
{ | |
} | |
} | |
} | |
final class ClearAntairLogScreenMenuItem extends MenuItem | |
{ | |
ClearAntairLogScreenMenuItem(int position) | |
{ | |
super("Clear Log", position, 0); | |
} | |
public void run() | |
{ | |
Debug.clearPersistedMessages(); | |
} | |
} | |
final class AntairLogScreen extends MainScreen | |
{ | |
AntairLogScreen() | |
{ | |
super(MainScreen.DEFAULT_CLOSE|MainScreen.DEFAULT_MENU); | |
StringBuffer text = new StringBuffer(); | |
BigVector logItems = Debug.getPersistedMessages(); | |
for ( int i = 0 ; i < logItems.size() ; ++i ) | |
{ | |
text.append((String)logItems.elementAt(i) + "\n"); | |
} | |
add(new RichTextField(text.toString())); | |
} | |
protected void makeMenu ( Menu menu, int instance ) | |
{ | |
menu.add(new ClearAntairLogScreenMenuItem(100000)); | |
} | |
} |
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