An Android app I'm working on uses logcat to write all log info from the project into text files that are stored in an installed device's sdcard. Currently the log files are limited to a 100 320 kilobyte files that the system starts overwriting when filled to save space and reduce clutter.
The app is part of a pair where another app sends user input information via MQTT messages and the other (this one) displays the information via HTML-based pages that uses CSS for layouts and JavaScript to update some values.
I'm having a problem where the log files are being filled with a log message like this:
<date and time here> 392-412 HWComposer pid-392 W Ignoring duplicate VSYNC event from HWC (t=0)
Since this is an Android warning and seems not something I can turn off inside the project is there any way to disable this specific warning from appearing in the app's log files?
The other app that doesn't use HTML, CSS or JavaScript and does not print the same line in its logs.
These messages are appearing at least tens of times every second which makes troubleshooting problems with the app all but impossible since the 100 files will be filled sometimes within 15 minutes because of the above message.
A quick and dirty solution would be to simply increase the number and size of the log files but that's not really feasible and it would be preferable to find out how to disable the specific Warning from showing up in the logs in the first place.
Currently the system is using
logcat -f /sdcard/logs.log -v time -n 100 -r 320
to log the information.
I've tried looking up information about logcat and its use but it seems to mainly focus on using filters to strip off unneeded information while running the program which is not really feasible for my use case since the logs are written into the files for later review.
I've tried going to the test device's Developer options and forcing GPU rendering but that didn't seem to change anything.
Thanks, any advice would be appreciated.
Is there a way to log Java runtime errors/exceptions in a PhoneGap/Cordova mobile application.
I just want to be able to see what is going on during execution. I'd like to store exceptions to a text file and then have the file sent back to me.
Thank you
I have a java application now i want to infrastructure monitor for my application logs at run time. I am using log4j for logging.I have filtering(monitoring) logs with chainsaw v2.Its working fine but my concern is how much logs data showing in chainsaw log console. please give me any suggestion.
I finally found the answer storage of chainsaw buffer size is 5000(means 5MB) goto view->show application-wide preperences -> general -> cyclic buffer size. you can see the image below
I'm not a Java developer so please remain calm if I write something incorrect.
I have a binary distributed Java applet which I decoded into quite readable source. My goal it to analyse activities of the applet. I see that the applet uses a lot of loggers to log actions, for example:
x.y.z.CONNECTION.LOG
x.y.z.GuiClient.GENERAL
etc.
But I don't see any of the messages in the Java console (however I see loads of other Java messages).
I put to logging.properties the following lines:
.level = ALL
x.y.z.CONNECTION.LOG = ALL
x.y.z.GuiClient.GENERAL = ALL
with no effect.
What should I do to see messages logged by the loggers above?
If it could help I run MacOS 10.8, JDK 1.6.0, the applet starts in Mozilla 21.0
Please advise.
I have found what the issue is. I made a mistake in logging.properties. I should have written:
x.y.z.CONNECTION.LOG.level = ALL
x.y.z.GuiClient.GENERAL.level = ALL
What does LogCat do in Eclipse?
How do I use it? I have never used the log cat before in Eclipse, so I don't understand.
This is a nice and quick way to exchange information from the application on your device and the development computer.
To use Logcat, first import android.util.Log into your project. Now you can call the static class Log from your project to start logging. As you can see below, Logcat has different levels of logging. When debugging, we’ll just use Debug (D) to log the progress. Of course, when you want to log an actual error, you will use Error (E).
V — Verbose (lowest priority)
D — Debug
I — Info
W — Warning
E — Error
F — Fatal
S — Silent (highest priority, on which nothing is ever printed)
For more detail, see Debugging in Android using Eclipse.
LogCat is an Android feature that allows you viewing logs emitted by the applications running on an Android device.
When you are running your application in debugging mode from Eclipse, you can see plenty of logs appearing in this window: those of your own application, but also those posted by the system and other applications running at the same time on this device.
To log something, you have first to determine how your message is critical (is this debuggin info, an informational message, a warning or an actual error message?) and then use the appropriate method:
Log.d("myApp", "my debug message");
Log.i("myApp", "my informational message");
Log.w("myApp", "my warning message");
Log.e("myApp", "my error message");
When you run your applications in debug you can have details on why they are crashing, plus if you want to write in it you can :
Log.i(String tag, String msg);
Logcat is some kind of file where all debug information and errors are stored.
You can simply access it by either using the command "adb shell logcat" in a terminal on your developer machine with the development sdk or download an app like "alogcat" from the market.
Like mthpvg and Pratik said, it is really handy and you can write your own messages in it.
Debugging in Android using Eclipse here is good explantation of how to debug your applications using the Eclipse IDE with the Android plugins,
You use LogCat by adding commands like this in your code:
Log.d(TAG, stringVar);
The TAG is a string constant that will help filter the output from LogCat. The TAG may be the name of your Activity or Application. You use the filter in the LogCat window to see only the filtered output.
String TAG = "AppName";
The stringVar can contain anything that may be helpful for your understanding of how the code works when you need to debug it,
An example is if you are unsure of the value of an int variable (f.ex. intVal):
--- code --
String stringVar = " value of integer intVal = " + new Integer( intVal ).toString();
Log.d(TAG, stringVar);
--- code end ---
LogCat is very useful. You can add the LogCat window in Eclipse by doing this "Window -> Show View -> Other -> Android -> Logcat"
The Android logging system provides a mechanism for collecting and viewing system debug output. Logs from various applications and portions of the system are collected in a series of circular buffers.
Logcat can be accessed using the command line. More information is in logcat (at Android Developers).
If you're using Eclipse and the Android plugin for Eclipse, it's available in the Debug perspective. More (unofficial) information about this is in Debugging in Android using Eclipse.
Logcat - used for debugging purposes
Print different messages to Logcat using android.util.Log class
Syntax:
Log.d(String tag, String message)
Sample:
Log.d("LIFECYCLE","onCreate was called");
Other methods:
Log.i(String tag, String message);//i = information
Log.e(String tag, String message);//e = error
Log.w(String tag, String message);//w = warning
I think the best explanation is in How to add LogCat?