How do I get the logfile from an Android device

Question

I would like to pull the log file from a device to my PC  How can I do that

User · Answer

Simple just run the following command to get the output to your terminal   adb shell logcat

User · Answer

Two steps          Generate the log   Load Gmail to send the log           Generate the log  File generateLog         File logFolder   new File Environment getExternalStorageDirectory     MyFolder        if   logFolder exists              logFolder mkdir              String filename    myapp log     new Date   getTime       log        File logFile   new File logFolder  filename        try           String   cmd   new String      logcat    -f   logFile getAbsolutePath     -v    time    ActivityManager W    myapp D             Runtime getRuntime   exec cmd           Toaster shortDebug  Log generated to      filename           return logFile            catch  IOException ioEx            ioEx printStackTrace               return null     Load Gmail to send the log   File logFile   generateLog    Intent intent   new Intent Intent ACTION SEND   intent setFlags Intent FLAG ACTIVITY NEW TASK   intent putExtra Intent EXTRA STREAM  Uri fromFile logFile    intent setType  multipart     startActivity intent         References for  1         https   stackoverflow com a 34883741 2162226   https   stackoverflow com a 3359857 2162226              For  2 - there are many different answers out there for how to load the log file to view and send   Finally  the solution here actually worked to both           load Gmail as an option   attaches the file successfully         Big thanks to https   stackoverflow com a 22367055 2162226 for the correctly working answer

User · Answer

I have created a small library   aar  to retrieve the logs by email  You can use it with Gmail accounts  It is pretty simple but works  You can get a copy from here  The site is in Spanish  but there is a PDF with an english version of the product description   I hope it can help

User · Answer

I know it s an old question  but I believe still valid even in 2018   There is an option to Take a bug report hidden in Developer options in every android device    NOTE  This would dump whole system log  How to enable developer options  see  https   developer android com studio debug dev-options  What works for me    Restart your device  in order to create minimum garbage logs for developer to analyze  Reproduce your bug Go to Settings -  Developer options -  Take a bug report Wait for Android system to collect the logs  watch the progressbar in notification  Once it completes  tap the notification to share it  you can use gmail or whetever else    how to read this  open bugreport-1960-01-01-hh-mm-ss txt  you probably want to look for something like this   ------ SYSTEM LOG  logcat -v threadtime -v printable -d   v  ------ --------- beginning of crash 06-13 14 37 36 542 19294 19294 E AndroidRuntime  FATAL EXCEPTION  main   or   ------ SYSTEM LOG  logcat -v threadtime -v printable -d   v  ------ --------- beginning of main

User · Answer

For those not interested in USB debugging or using adb there is an easier solution  In Android 6  Not sure about prior version  there is an option under developer tools  Take Bug Report  Clicking this option will prepare a bug report and prompt you to save it to drive or have it sent in email   I found this to be the easiest way to get logs  I don t like to turn on USB debugging

User · Answer

Often I get the error  logcat read  Invalid argument   I had to clear the log  before reading from the log   I do like this   prompt gt  cd   Desktop prompt gt  adb logcat -c prompt gt  adb logcat   tee log txt

User · Answer

First make sure adb command is executable by setting PATH to android sdk platform-tools   export PATH  Users espireinfolabs Desktop soft android-sdk-mac x86 platform-tools  PATH   then run   adb shell logcat  gt  log txt   OR first move to adb platform-tools   cd  Users user Android Tools android-sdk-macosx platform-tools    then run    adb shell logcat  gt  log txt

User · Answer

I would use something of this sort     adb logcat -d  gt  logcat txt   The -d option dumps the entire circular buffer into the text file and if you are looking for a particular action intent try   adb logcat -d   grep  com whatever you are looking for  -B 100 -A 100  gt  shorterlog txt   Hope this helps

User · Answer

A simple way is to make your own log collector methods or even just an existing log collector app from the market   For my apps I made a report functionality which sends the logs to my email  or even to another place - once you get the log you can do whether you want with it    Here is a simple example about how to get the log file from a device    http   code google com p android-log-collector

User · Answer

Thanks to user1354692 I could made it more easy  with only one line  the one he has commented   try       File file   new File Environment getExternalStorageDirectory    String valueOf System currentTimeMillis          Runtime getRuntime   exec  logcat -d -v time -f     file getAbsolutePath     catch  IOException e

User · Answer

I hope this code will help someone  It took me 2 days to figure out how to log from device  and then filter it   public File extractLogToFileAndWeb              set a file         Date datum   new Date            SimpleDateFormat df   new SimpleDateFormat  yyyy-MM-dd   Locale ITALY           String fullName   df format datum   appLog log           File file   new File  Environment getExternalStorageDirectory    fullName              clears a file         if file exists                 file delete                          write log to file         int pid   android os Process myPid            try               String command   String format  logcat -d -v threadtime                            Process process   Runtime getRuntime   exec command                BufferedReader reader   new BufferedReader new InputStreamReader process getInputStream                  StringBuilder result   new StringBuilder                String currentLine   null               while   currentLine   reader readLine       null                       if  currentLine    null  amp  amp  currentLine contains String valueOf pid                             result append currentLine                          result append   n                                                     FileWriter out   new FileWriter file               out write result toString                 out close                   Runtime getRuntime   exec  logcat -d -v time -f   file getAbsolutePath               catch  IOException e                Toast makeText getApplicationContext    e toString    Toast LENGTH SHORT  show                          clear the log         try               Runtime getRuntime   exec  logcat -c              catch  IOException e                Toast makeText getApplicationContext    e toString    Toast LENGTH SHORT  show                       return file          as pointed by  mehdok  add the permission to the manifest for reading logs   lt uses-permission android name  android permission READ LOGS    gt

User · Answer

Logcollector is a good option but you need to install it first   When I want to get the logfile to send by mail  I usually do the following    connect the device to the pc  Check that I already setup my os for that particular device  Open a terminal Run adb shell logcat  gt  log txt

User · Answer

EDIT    The internal log is a circular buffer in memory  There are actually a few such circular buffers for each of  radio  events  main  The default is main   To obtain a copy of a buffer  one technique involves executing a command on the device and obtaining the output as a string variable   SendLog is an open source App which does just this  http   www l6n org android sendlog shtml  The key is to run logcat on the device in the embedded OS  It s not as hard as it sounds  just check out the open source app in the link

[android] How do I get the logfile from an Android device?

Examples related to android