Logcat in eclipse keeps auto clearing - android

until recently my logcat has been fine but all of the sudden whenever i try to view it in eclipse it just keeps clearing itself whenever anything is displayed making it impossible to read. viewing it in the adb works but I never bother with that since it is just such a pain to read and find anything you are looking for.
is there a way to fix this problem?

The Logcat messages were simple getting cleared because the buffer had run out of space (receiving too many new messages), which is a simple setting change in Eclipse.
To fix, go to Window > Preferences > Android > LogCat
and increase the limit for "Maximum number of LogCat messages to buffer". Set it to 0 for unlimited size, or a really big number. But keep in mind, anything below 10000 fills up real fast.
Been answered already:
Eclipse Android - Logcat Clearing too Fast

It will show one line before erasing it to show the next one? Just click the verbose button again.

There's a workaround for this bug. Click active mode button (usually verbose), choose another device from device list and choose previous device again. It will restore all logcat messages.

LogCat is really annoying for this. In Ubuntu, I found the following works really well:
Open a terminal and type adb logcat | grep MYINFO
This will only show adb messages filtered by the MYINFO string.
So, you can code something like:
Log.v("MYINFO", "x" + x_value + ", etc...");
This is such a relief to use. A life saver! See this for more info.
You may find sometimes the logcat buffer repeats previous logs on starting again. To overcome this, type
adb logcat -c

Related

LogCat is not showing null pointer exception

My LogCat is often not showing null pointer exceptions..
Sample:
ProgressDialog pd;
ps.show();
Application stops (do not reacts for any action), but there is no information about any reason in logcat.
Another sample is with database - if there is no DB and I'm making actions on it, the same happens.
I tried (that action with DB) on my colleague's phone and there was normal error. I have all needed programmer options in my phone turned on.
Maybe someone know , why it is so? It was not burdensome, when I had small app, but now when it's bigger, it can be really frustrating.
I get this with android studio too...
Close android studio, restart ADB, and generally it starts working for me.
If that does not work then put a breakpoint at the line .show(); ... Then open up the logcat and then skip over the breakpoint. It then shows, I have similar issues.
(Windows 7 64 bit - Android Studio 0.82)
I dont like the IDE logcat option honestly.
The SDK comes with an adb binary, use the logcat option from there via
adb logcat or my personal favorite built in alias, adb lolcat
This will give you the log information for EVERYTHING happening on the device, and can be useful tracking down issues caused by device state.
For example, you can see network changes in the logcat, and if your app crashes on network call you wouldnt have any idea why if you just used the logcat output from your app.
In my case I was using: Thread.setDefaultUncaughtExceptionHandler in my application file. If that is not turned off during debugging you won't see any exception output. ( Just make sure to turn it back on again when you release so you can still handle your issues ).

Logcat messages disappear after a short time

Sometimes eclipse logcat messages disappear after closing the app for a short time. (Mostly not so short.) How to make it never disappear automatically?
EDIT: My device is still attached. And how to set it to show log even after device disattach and clear just before next launch?
this is also happening with me. The device is attached. And so all the internal actions are getting logged and the error message disappears very quickly. You should try the following (it worked for me)
Restart Eclipse (as stated here Why logcat is not showing anything?)
if 1 does not work, you may try to increase the logcat message size. From Window > Preferences > Android > LogCat (increase size to more than 5000)
First one worked for me. In this way also you need not to detach the device everytime you deploy the app from eclipse. Regarding, the other question - you can always clear the existing log from [Clear log] button.

why does logcat drain messages

When I test my android app, I log messages that show up on LogCat. But the messages drain out the top of the window quickly making it impossible to read them quickly enough.
How can I stop this?
There's a scroll lock in the logcat window that you can use to pause the printout for a moment.
To get complete logcat messages, you can redirect them to a file:
adb logcat >& output.log
It depends somewhat on what you mean by "drain". If the problem is simply that messages are scrolling by too fast and you need to stop auto-scrolling to the bottom, you can pause this feature in the IDE (or in DDMS/Monitor). HOW you pause it depends on your IDE, in IntelliJ you can just click somewhere in the log output to place a cursor, and in Eclipse there is a button above the logcat window to pause the output scrolling (don't forget to turn it back on or you won't see new messages).
However, if your problem is that so much data is being logged that you cannot scroll up to see what you need even if scrolling is paused, you need to log less. This is because the Android logcat driver is a fixed-size 64KB circular memory buffer. So if you log enough data, it will begin to overwrite the older entries in the log and they will be gone before you've had a chance to read them.
There are some methods:
Disable the auto scrolling feature. Click on the "Scroll Lock" button to disable this.
Use the command line tools. Run "adb logcat | less" and you can navigate for the results. You can also run "adb logcat > logcat.txt" and inspect logcat.txt after that.
Why don't you filter the logcat, so it shows the things your are most interested in.
You can display only the tags you are interested in with the following syntax (using the adb tool from the command line - also available in the logcat view in Eclipse):
adb logcat TAGTOSHOW:* TAGTOSHOW2:* *:s
You can include as many TAG combinations as you want. Don't forget the *.s which silences all the rest.
I prefer teeing to a file:
adb logcat | tee foo.log | grep "YOUR_TAG_OF_INTEREST"
This way you get whatever you think you're looking for in your terminal window, but if you need to look at the full logs you have them saved off in a file.

Strange logcat filter behaviour

Sometimes I am on the lookout for specific logcat messages for debugging purposes and its critical to see exactly when they appear. I then make a logcat filter (call it xx) in eclipse ready to spot the critical message. I then highlight the xx filter and run my app and look out for my message - nothing appears in my xx filer view - but I notice increasing numbers win brackets next to the "All messages (no filters)". If I then click on the All messages thing and then go back to xx then hey-presto my messages are visible. Its almost as if eclipse is determined never to let me see these messages as they arrive. Is there anything I can do about this?
I've found that part of the eclipse plugin very unreliable, especially if there are a high volume of log messages it is prone to making the whole window slow / freeze.
Personally, I tend to run logcat in a shell, sometimes piped into grep
tee can also be useful, to write a copy to disk for later examination.
Make sure that logcat isn't paused.

Android Dev: Logcat in Eclipse - can't restrict output to V/D/I/E?

I'm using Logcat in Eclipse. I've been unable to find documentation online telling me as such, but presume that the V, D, I, E etc. buttons when clicked should restrict Logcat output to that pipeline? No matter which I select, every logcat output is spewed out, and it's making debugging nigh on impossible.
Can someone please tell me how to display only Debug output, i.e. Log.d(..) prints? I don't think this is possible using a filter, since I've tried creating one with log level 'Debug' and an empty tag and pid field, yet this simply prints all log outputs again.
Many thanks!
UPDATE
So, thanks to Aleadam's link below, I'm now aware that V/D/E/ etc. are 'priority levels' and include those priorities lower than themselves. It doesn't seem possible to restrict to only D(ebug) output, but at least I know how to restrict to D,V since V(erbose) is the only priority level lower than Debug:
adb logcat *:W
Of course, this must be done via the command line, so I'm now going to figure out how to employ the same strategy in Eclipse. The buttons really aren't working for me, I've no idea why, but it's frustrating!
Many thanks for all the information you've posted, guys.
Those buttons should work in the manner you're describing so long as they were logged with the appropriate API call in the Log class. http://developer.android.com/reference/android/util/Log.html
Regexes/wildcards do not work. There's a bug I requested from almost a year ago. http://code.google.com/p/android/issues/detail?id=11580&can=4&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars
adb logcat *:D will not show only debug, but everything with debug priority or higher.
For example, adb logcat *:E > err.log will save errors only.
For many options, check "Filtering Log Output" in here: http://developer.android.com/guide/developing/tools/adb.html#logcat
If you're running under linux use grep. If you're on windows, use the shell: (e.g. adb shell "logcat |grep 'D\/'")
Filtering works on my system but I specify a Log Tag. This then creates a new button next to Log. So for Log Tag "QPR" I see [Log][QPR] buttons and when I press on [QPR] I only see logging that has been tagged as "QPR" as in Log.d(TAG,"onCreate",e);
At least on my system if I click on [Log] (E) I only get errors.
Hope that helps,
JAL

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