Not getting Android logging in adb? - android

I'm running a Unity3D app and have put some prints (Debug.Log and print) around the code which should be getting hit. I've confirmed that they are and have made sure all logging in build settings are set to 'Full'.
Not sure why the output isn't coming through in adb logcat. However interestingly null reference exceptions are being printed so there must be something going on there..
For example I have the following code in ana update function in a scene (and nothing else):
void Update(){
print("WILL THIS WORK?");
Debug.Log("####################### I AM HERE");
object o = null;
print(o.GetType());
}
adb logcat shows the following output:
I just found the only type of logging which works is Debug.Error, so this might have to do with some level of error logging but not sure what it could be, in my inspector I have the following set:
So it should log everything..

Pay attention to your screenshot. You cannot see your own log because Unity is showing its own error. Usually, when you get an error the rest of the code in that frame is abandoned until the next frame. This used to be the behavior of Unity and I think it's still the behavior and your current issue. That error in your Update function in the Platform.TestAuth script.
Fix the NullReferenceException you are getting and then you should be able to see your log appear.

Related

Android Studio: Logcat vs Run

What's the difference between Logcat and Run in Android-Studio?
Logcat has filter-options. Beside that I don't get which specific purpose each serve.
In how far do the messages differ, which become printed to each console?
When do I use which console?
Personally,Logcat is more useful for debugging and being aware of what is going on while the app is running. You set the type of the log and set tags to them, by this way you can easily filter logs. This gives you much more clear picture in terms of logging.it stated in this article
Logcat is a command-line tool that dumps a log of system messages, including stack traces when the device throws an error and messages that you have written from your app with the Log class.
Also, it is stated that (in the same article)
The priority is one of the following character values, ordered from lowest to highest priority:
V: Verbose (lowest priority)
D: Debug
I: Info
W: Warning
E: Error
F: Fatal
S: Silent (highest priority, on which nothing is ever printed)
each one of these shows the logs from their priority to highest one . Verbose, for instance, will print all the logs but if you switch to error , logcat only shows error and fatal logs.
Additionally, if you set a tag filter it will only shows the logs that is tagged with that "tag", of course while keeping the priority filter. For instance
Log.e("tag1","message_1");
Log.e("tag2","message_2");
Assume you have filter the tags with "tag1". The logcat will print "message_1".
Similarly
Log.e("tag1","message_1");
Log.i("tag1","message_2");
Again, assume that you have filter tags by "tag1" and priorities with Error.Then, the logcat will show only "message_1".
For the run tool also shows logs , prints (println etc.) but in comparison with the logcat it will show a lot more stuff (logs, prints (println etc. and phone related informations).
apart from your logs other logs that comes from libraries and phone itself also are shown in the run tool. So it hard to find your own logs.
Run will be useful when the phone and library related information logs needed.(for instance when the phone misses/drop frames it will be printed in run)
Logcat will be useful for your own logs.When you are trying to understand what is going on while the app runs etc..
I have noticed a big difference between the run and the logcat while using avd emulators. I had a deceiving crash on my app, only while I was using the emulators .
every time there was a crash , the logs before the crash were disappearing from the logcat , and I couldn't understand if I see the logs related to the crash. after a week of trying to find a library that prints the logs to a file I found out that everything is printed in the run tab, so I don't need that.

Is it possible to get extra info from "unfortunately app has stopped working" error?

In my app when some services of it are running it suddenly displays that message on some occasions, but most of the time they work properly, when I've tested them I haven't had any problem.
I'd like to know if its possible to associate the event that causes that message to appear, with giving some extra information or at the very least writing a log that at least shows which class and what line of code causes the error.
From there I could investigate with greater ease what makes that message to appear, as right now I've no clue.
I'd like to know if its possible to associate the event that causes that message to appear, with giving some extra information or at the very least writing a log that at least shows which class and what line of code causes the error.
Every time that dialog appears, a Java stack trace is written to LogCat automatically. You can use Android Studio or other development tools to examine LogCat.

Android : How to enable logging Log.v values which are by default disabled

I am a novice to the Android Studio and working on one group project.I am trying to log some variable values to logging.
When I use Log.e values are properly logged. While when I use Log.w or Log.v nothing gets printed. Here I am switching from logcat from error to verbose and to warning as I am using Log but still can't see anything printed.I previously used Toast but heard that using it might make my app slow and using Log.e everywhere is not a good practice.So how to print logs of lower priority?
I tried referring following resources but didn't find anything that could help me enabling logging for lower priority Logs, Just got the info that for some reason lower priority logs are disabled.
https://developer.android.com/reference/android/util/Log.html
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
Thank you in advance.
All logs are always default enabled.
I think you are viewing logs in error view.
Check
You are viewing logs in Verbose
Your filter is set to selected app.
You have selected your app not other app. (where in below image no debuggable process is written)
Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
Log.e: This is for when bad stuff happens. Use this tag in places like inside a catch statement. You know that an error has occurred and therefore you're logging an error.
Log.w: Use this when you suspect something shady is going on. You may not be completely in full on error mode, but maybe you recovered from some unexpected behavior. Basically, use this to log stuff you didn't expect to happen but isn't necessarily an error. Kind of like a "hey, this happened, and it's weird, we should look into it."
Log.i: Use this to post useful information to the log. For example: that you have successfully connected to a server. Basically use it to report successes.
Log.d: Use this for debugging purposes. If you want to print out a bunch of messages so you can log the exact flow of your program, use this. If you want to keep a log of variable values, use this.
Log.v: Use this when you want to go absolutely nuts with your logging. If for some reason you've decided to log every little thing in a particular part of your app, use the Log.v tag.
Explanation by link Kurtis Nusbaum
Update:
If above things does not work then you are facing an device setting issue. Some mobiles have set default log level to DEBUG or ERROR. Allow logging from phone setting.
You can check if log is loggable by Log.isLoggable()
Check
Settings -> Accessibility -> Developer options -> advanced logging->set "Allow all"
or
Settings->Accessibility - > Developer Options -> Performance optimization -> Advanced logging -> set "Allow all"
or for other phone search in "developers options": option "logging" and set "all".
also you can use Log.wtf when your Log.d is not working.
try restarting android studio also

How to print a string to logcat for testing?

I know this question has been asked before, but I can't find a clear answer. I'm new to Android Studio and the logcat console confuses me. I have a string date and I want to keep 'track' of it in the console so I know what value it has.
I tried commands like Log.i and console.log, but they don't seem to work for me.
Where should I write my print line code?
Where can I see it when it gets printed?
Do I have to run the whole app (on the emulator, or on a device) to print the line to the console?
Where do I write my print line code ?
That is up to you.
Where can I see it when it gets printed ?
In LogCat:
You will get this from the Android view (usually docked on the bottom edge on the left side). Note that I have sometimes encountered a bug where the automatically-applied filter for your app (right-hand drop-down list, above the output) seems to result in nothing showing up in the output. You may need to remove the filters, then adjust the output based on log level.
You can also view LogCat at the command line via adb logcat and in the Android Device Monitor (Tools > Android > Android Device Monitor from the Android Studio main menu).
Do I have to run the hole app (emulator or via a device) to print the line to the console?
Yes.
Your use of Log.i is the correct way to write to Logcat. Here is the documentation for Log.
I typically use a tag that describes the stage I am in (setup, teardown, UI update, etc), and I will usually log any action that can trigger an exception.
To view the Logcat, there should be a window for that in Android Studio. When the windows is not visible, you can access it from a tab in the lower left corner of the screen:
if you want to show logs in error
you can write
Log.e("Your Tag for identy", "Your String ");
if you want to show logs in info
you can write
Log.i("Your Tag for identy", "Your String ");

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 ).

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