When I run my android app, the logcat window fills up and then clears. I have System.out.println()'s that aren't showing up, nothing is showing up and I have no idea why.
EDIT: Using Android Studio
I have had a lot of issues with logcat in Android Studio, so here's a few items:
In your run configuration (just to the left of the play button, select "Edit Configuration" from the drop-down, you can configure a couple of options related to logcat, including whether or not Android Studio will clear it on startup
If the debugger disconnects you will lose your connection to the logcat. (some kinds of errors seem to force disconnect the debugger. I'm not entirely sure why.)
If you never clear your logcat, then Android Studio will attempt to display the entire logcat since the last time you restarted the device/emulator. This can take a long time, and may display a blank screen while it's processing.
By default, Android Studio will try to filter out messages unrelated to your app. In my experience, this never works right. I think it's easier to search for the tag that you're looking for.
I haven't specifically tried System.out.println() in Android Studio, but the typical Android way to print debug messages is with Log.d. Log
is located in android.util.Log. Android Studio will import it automatically if you type Log and press alt+enter.
My guess would be that your problem isn't that it's clearing logcat, but that it's not clearing logcat and Android Studio is choking on too large of a log file. Either select auto-clearing from the run configuration window or try walking away for a few minutes and see if the logcat ever comes back
Related
While coding, sometimes we'd like to put some simple print statements at some location just to see some specific behaviour, but, when running android studio, our app is basically running on a physical cellphone(in this case, just considering the cellphone and not an emulator), but, how do I make the print statements print to my computer's terminal?(Currently using ubuntu 16)
Log calls (e.g., Log.d()) are recorded by Logcat. Those messages are visible directly in Android Studio in the Logcat tool window. If you really want to view Logcat in a terminal window, use adb logcat.
Piggy-backing off what #CommonsWare pointed out, you can also use the Run window to see less of the system logs and information more specific to your actual run of the app. This was helpful for me in the beginning but sometimes you need the verbosity of the Logcat window. If you end up using the Logcat window, there should be a search bar at the top of the window that you can use to filter out specific messages.
For example, if you call Log.i(tag, message), you can search for tag in the Logcat window and only those messages will be shown! Hope it helps narrow your search.
As the title of the question said. Steps I did:
click on Update heap
In Allocation Tracker tab, click "Start Tracking"
Click "Get Allocations"
In the console, I saw red messages saying:
[2013-12-29 13:56:40 - ddm-heap] *** Received REAL`
What happened? am I missing anything?
Thanks
It needs to be done in Android Studio. (Thanks to the Project Member who said this on this bug report: https://code.google.com/p/android/issues/detail?can=2&start=0&num=100&q=&colspec=ID%20Status%20Priority%20Owner%20Summary%20Stars%20Reporter%20Opened&groupby=&sort=&id=74059)
You can see that the icons even have the same name as the icons in DDMS (which is confusing)! But the Allocation Tracker in DDMS does not work, and the one in Android Studio "Android Monitor" does.
P.S. In the screenshots I was using Android Studio 2.3 and Android Device Monitor version 25.2.2.
Wrong (Does not work):
Right (works):
The results will show up in a window next to your source code like this:
For more info:
https://developer.android.com/studio/profile/am-memory.html https://developer.android.com/studio/profile/am-allocation.html
Well, REAL is a REcent ALlocation.
Based on the source code, logging an error is the very first line of handleREAL(). Just an assumption - this should be Log.d() instead of Log.e(), but I cannot say for sure.
And yes, "Get Allocations" for me works not every time I click it. The resulting log cannot be exported, and disappears as soon as the app on device finishes. Sadly, not a very convenient tracing tool...
My logcat is behaving very strange. If I have started or restarted the eclipse it is showing the logcat values but once I clicked any option For example Allmessages(nofilters) or com.applicationname(sessionfilter) then suddenly logcat is getting empty. I am not able to figure out what is the problem. This problem started once I updated my ADT to 22. Can any one please tell me what is the problem and how to solve this
Thanks
1. If you are using Eclipse, in the DDMS perspective, make sure the correct device (probably emulator-xxxx) is selected and highlighted. Only then will you get the logcat output in the logcat view.
Also, the Android plugin is a bit unstable, and sometimes only shows the last line in the logcat view. If this happens, try to clear the log. After that, you should get all the log entries again.
2. However this sometimes happens also, when you have Mylyn installed.
http://code.google.com/p/android/issues/detail?id=1808
3. If the LogCat panel is empty in Eclipse the emulator doesn't have the focus. Go to the DDMS perspective and try clicking on the 'emulator' entry in the Devices panel (top-left screen).
In my case, it usually takes 20 or more seconds for my logcat to display anything. After it does, I see "debugger waiting to settle" messages. This happens every single time.
Try waiting a while to see if it ends up showing up.
I'm noticing a strange behaviour when i plug in any android device to my computer.
It starts showing some messages in the LogCat in Eclipse as soon as i plug it in. Same thing with my HTC and ASUS tablet.
This has never happened before and I dont remember doing anything out of ordinary when I developed my app yesterday.
Any1 has an idea how to stop this ?
Thanks in advance
You can add filters to the logcat so that you only show relevant information.
From my experience it's perfectly normal for the logcat to start displaying messages as soon as you plug in a device. At the least it means it's working! ;)
However, once you start building and running your application and picking up errors the specific filter for your application will start displaying which will only show logs pertaining to your app.
It's set by default to switch to your app once an error displays, but you can change that default by going to Preferences > Android > LogCat and changing "Show logcat view..." from "Error" to "Verbose" or whatever works. That way it will switch to showing your application's logs faster. Beyond that, you can do further specific filters.
Hope that helps XD
This can't be stopped as such as the log cat in eclipse will retrieve anything where logging is being done of some sort whether it is an app, or android itself.
You can filter it, I think at the top of the log cat window there is a text field to only show log messages that contain a certain string and If I remember correctly there are also buttons to the right to only show error messages or warning or both etc.
I had the same problem with my Nexus 5. Eclipse wouldn't recognize the device, so I messed around with the device window a bit and then the log cat started to go crazy.
After several reboots, I un-checked the USB debugging option in the phone's Developer settings and re-checked it.
Problem solved.
I think something in the Device window changed when I performed this action, but I'm not certain.
The log tab is visible in DDMS and I have been logging data using Log.v(...) for many a week now without any problems.
Today, the log data is now longer being displayed in the Log window. Worked, then did a programming change to track a bug and now the log data is no longer showing.
Have tried running the app on an external Android phone, on the Android Simulator and it makes no difference.
Have closed down Eclipse, reloaded and still no change.
The console displays activity but only to the point of starting the activity.
The external phone is set up for debugging - not that this could be a problem since I have the same problem with the simulator
It looks like I have inadvertantly set something incorrectly but can't remember changing anything :-(
Anyone come across this problem before - have looked at previous posts but none seem relevant.
Regards,
Oliver
I had the same problem a while back. I was using the emulator and device for debugging. Apparently you have to select the device listed in the DDMS view whose logs you want to see. My logs were blank because the device that I was expecting logs from was not the one selected.
Hope that helps
Tried this:
https://stackoverflow.com/a/9826502/1238317
Check in your logcat window - TOP RIGHT corner PAUSE button || (Pause
receiving new logcat messages)
Few clicks + eventually restart eclipse (usually works in my case)
Check your LogCat window to see if you are filtering and make sure to set the debug level to Verbose.
There are possible reasons and solutions:
LogCat might have to much in cache, clear the log and see if it fixed the issue
You might need to select the device in the device view (even if it is already selected, try to click on it)
adb is not correctly working anymore, try to kill and start it again
Check if you see output if you use the command line adb logcat
Just go to DDMS perspective and click on the device's name in upper left corner and done your log cat will Start with a BOOm :P
In Android Studio, which I have found to be much more reliable and intuitive than Eclipse, I found this to be a common issue. For me what solves it (device is automatically set when running your app) besides checking code, is to Quit and restart the emulator or Quit Android Studio and Emulator and reopen/restart