for unknown reason my phone create too many logs without any application tag.
it's so rapidly that my own app's log wont last more than 2 second.
someone has already asked but nobody has answered yet.
Real device produce too many log
you gotta cancel all the background process that are running in you device, and some logs which you have mentioned are general log which will be constantly running in all the android device
Select show only selected application. Check this android developer resource
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I have an app installed on my device.
An app that I developed, but I haven't got the source code anymore.
Is it possible to attach log cat to this app?
yes you can, just enable usb debugging on your android device, and plug the device where you have the application installed on it, by that, you will see all the logs on logcat.
Depends if you've left logs in the code. If you did, the easiest method would be probably going into your Android Studio and checking you Android Monitor tab. You can switch devices / applications there.
If you don't have any logs and your question actually means you want to add some logs in, then I'm afraid you can't reliably do that.
I'm trying to fix a seemingly random crash in my app. The problem is, I've left it connected to my debugger in Android Studio for hours and it won't crash. In fact, it only crashes when the app is not in the forefront. I'm pretty sure it has to be related to my broadcast receiver, but I can't reproduce it at will.
Is there any way I can recover the logcat from the crash if I attach the debugger after a crash? Is there an easy way to log to a persistent file?
Create bug report on your phone and send it to your email. After that you could search for your app package crash information.
You can make bug report under Developers options in phones settings or you can enable Power menu bug report (more convenient) under the same Developers options section.
Egor had the answer. I thought my error was not showing in my logcat because either things were showing up out of order in my logcat or Android Studio was showing me things that happened over half an hour ago. Basically, I connected the debugger and saw that the first thing in the logcat was about updating the app and connecting the debugger, and so assumed that I had missed whatever came before. The error was about twenty lines down from there.
I was wondering if there is any way to get any feedback of what's going on behind the scenes when running an app on an Android device. If I use the emulator and eclipse I can see what's happening in the logcat. But I'm making a program with ROS android and it I cannot run it on the emulator. Now my program crashes and I don't know why. Is there any way I can get more information?
Thanks
You can use adb to debug the app on your device. See http://developer.android.com/guide/developing/device.html
I can think of a couple (less than elegant) ways to try and find out what's going on.
1) Display toasts from potential problem areas (Does it have a screen?)
2) Write logs to the SD card (does it have an SD card??)
EDIT
I wasn't thinking clearly... you have to be able to load the program to the device, so you must be able to connect it to your PC. So, as Agarwal pointed out, you can most likely hook it up, run it on the device/robot/whatever and see what happens with the logcat.
I use IntelliJ IDEA to write Android apps, and use the DDMS Windows application to view the Android logs (separate from the IDE). It works fine, but after a seemingly random period of time, the logs vanish, except for one line of log, which gets overwritten with incoming logs. I have to shut it down and restart it, which combined with the delays of deploying an app to a device over ADB to debug and test is pretty tiresome.
Is this a known issue with DDMS? Is there anything I can do to make it work consistently without breaking itself?
Are there any other Android log viewing applications for Windows that work better? I'm not very fond of the IntelliJ IDEA one. My favourite is actually CatLog on Android itself, but on a small-screen device it's not a great experience.
It's not about the time, but number of lines being recorded. As Dave C said in the comment, just clear the log and it will be fine
Have you tried looking at "Why doesn't LogCat show anything in my Android?"? The top voted answer may solve your problem
Android newbie. I am writing up a simple Google Maps application but when I start up my Android Emulator, it displays the "No Service" message, and I am unable to see the actual map. A couple of days ago everything was working fine, and I was able to connect. Didn't really make a change that could affect this.
Any idea about what might be going on?
The emulator attempts, somehow, to sniff on an Internet connection on startup. If it does not find something it likes, it pretends to be in offline mode. You can tell this from the signal strength icon -- instead of the normal two bars, you get zero bars and an X.
Just restart the emulator, and you will probably get your connection on the second try.
I ran into this exact problem tonight. My research showed that the emulator tries to connect to the first network adapter it can find. Success or failure is all based on that first adapter. For me, I had a VPN with a name that started with A. I renamed it to "VPN" so that it was below the "Local Network" adapter, restarted the emulator and voila! it worked.
Silly? Yes. Stupid? Yes. Works? Yep.