How to capture a logcat (non-root and root)
Logcat helps you diagnose the errors
of app, hardware, etc
There are two ways to capture a
logcat
Non-rooted device:
Download ADB portable:
Open Launcher.bat
On your device, enable USB-debugging
and connect to your computer
Launch CMD or Powershell and type
the command to output logcat to file
adb logcat > “E:/ log cat.txt”
Always use quotes if the path contains spaces. Many peoples don’t know
this trick
Reproduce the problem on your device
in order to grab the interesting errors in logcat
Nothing will appear in the prompt
while outputting to file. To stop it, press CTRL+C or close the prompt
The file will be saved
Rooted device:
There are many different apps of logcat
reader
Don’t know which one? Just install
MatLog. I recommended it: https://play.google.com/store/apps/details?id=com.pluscubed.matlog
Or download my pre-build which works
better than Playstore version
Launch MatLog, click on 3 dots ->
File -> Record
Name the file or just click OK
Reproduce the problem on your device
in order to grab the interesting errors in logcat
To stop logcat, stop it from
notification or on the app.
The .txt will open straight away after
that
Understanding logcat:
It’s hard to explain but I can
explain some of them
Logcat have following priorities:
V: Verbose
D: Debug
I: Info
W: Warning
E: Error
F: Fatal
The log message format is usally
like:
date time PID-TID/package
priority/tag: message
For example, the following log
message has a priority of D and a tag of FireBaseApp:
07-26 17:10:26.237 9949
9949 D FirebaseApp: com.google.firebase.auth.FirebaseAuth is not linked.
Skipping initialization.
If you know the internals of app,
hardware, etc. You will understand the log. You can always search on Google
It’s better to read the log from
bottom and scroll up to find errors and understand activities easier, like I always
do without using search.
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