How To Read Android System Logs

Date:

Accessing From The Command Line

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Another option is to view the debug log via the command line. Open acommand prompt window and navigate to the Android SDK platform-toolsfolder \Android\android-sdk\platform-tools).

If only a single device is attached, thelog can be viewed by entering the following command:

$ adb logcat

Another option is to view the debug log via the command line. Open aTerminal window and navigate to the Android SDK platform-tools folder.

If only a single device is attached, thelog can be viewed by entering the following command:

$ ./adb logcat

If more than one device is attached, the device must be explicitlyidentified. For example adb -d logcat displays the log of the onlyphysical device connected, while adb -e logcat shows the log of theonly emulator running.

More commands can be found by entering adb and reading the helpmessages.

How To Get Crash Logs From An Android Device

As a prerequisite to all these steps, you should have installed Android Studio and added the command line tools to your path. These local methods make use of the adb tool. You should also have a device or emulator connected which has had developer options enabled.

Note: if you are comfortable using the Device File Explorer in Android Studio directly, you can open device files directly from there rather than using adb pull.

Start Logging Device Events

  • Youre now ready to start creating a log. Run the following command in the Command Prompt window. Replace the with the ID obtained in the previous step.
  • adb.exe logcat -v threadtime  >  C:\android-debug.log

    Example

    adb.exe logcat -v threadtime PT99621AA1A40100564 >  C:\android-debug.log
  • Interact with your Android device and reproduce the bug or crash or whatever activity it is you want to log.
  • Once youre done, return to the Command Prompt window, and tap Ctrl+C to end the log.
  • The log can be accessed from the root of the C drive. The file will be called android-debug.log.
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    Writing To The Debug Log

    Messages can be written to the Debug Log by using the methods of theAndroid.Util.Log class.For example:

    string tag = "myapp" Log.Info  Log.Warn  Log.Error  

    This produces output similar to the following:

    I/myapp   : this is an info messageW/myapp   : this is a warning messageE/myapp   : this is an error message

    It is also possible to use Console.WriteLine to write to the DebugLog â these messages appear in logcat with a slightly differentoutput format :

    System.Console.WriteLine  

    This produces output similar to the following in logcat:

    Info  / mono-stdout: DEBUG - Button Clicked!

    Viewing Alternative Log Buffers

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    The Android logging system keeps multiple circular buffers for log messages, and not all of the log messages are sent to the default circular buffer. To see additional log messages, you can run the logcat command with the -b option, to request viewing of an alternate circular buffer. You can view any of these alternate buffers:

    • radio: View the buffer that contains radio/telephony related messages.
    • events: View the interpreted binary system event buffer messages.
    • main: View the main log buffer does not contain system and crash log messages.
    • system: View the system log buffer .
    • crash: View the crash log buffer .
    • all: View all buffers.
    • default: Reports main, system, andcrash buffers.

    The usage of the -b option is:

     logcat 

    Here is an example of how to view a log buffer containing radio and telephony messages:

    adb logcat -b radio

    You can also specify multiple -b flags for all of the buffers you want to print, as follows:

    logcat -b main -b radio -b events

    You can specify a single -b flag with a comma-separated list of buffers, for example:

    logcat -b main,radio,events

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    Key Advantage Of Adb:

    Though there are many advantages, I am going to explain one which can be used to install the android applications. It will be good for you if you will install the .apk file via ADB rather than doing manually. So you need to follow below steps:

    1. Keep the .Apk file in any folder on the host computer.

    2. Connect the Android device to which you want to install the .apk file with the host computer.

    3. Open the command prompt, type command Adb Install and give a path to the folder where the .Apk file is available in the folder as shown in the below figure:

    The high pointed content Success in the above figure shows the installation status of an application.

    How Will You Use Adb

    Now that you have the environment ready to use the ADB, get ready to use ADB to catch the crash logs of the android application whenever you face a crash error on your device. For average users, the only time you will require to use ADB is when you have step-by-step instructions.

    A) Enable USB Debugging Option of Android Devices:

    To use ADB with a device connected via USB, you must enable the USB debugging option in the device system settings, under Developer options.

    On Android 4.2 and higher, the Developer options screen is invisible by default. To make it visible, go to Settings > About phone and tap Build number seven times. You need to go back to the previous screen to find Developer options at the bottom of the screen.

    B) Connect your Device:

    Now connect your android device or Emulator devices with the host computer via USB cable.

    C) Access Android-SDK Folder:

    1. Open the Command Prompt.

    2. The most important thing to know how to access your ADB folder via commands. This is done with the cd command. So if your SDK folder is called android-SDK and its in your root directory or you can keep the android-SDK folder in any other directory like D, E, and more.

    I have given the name of the android-SDK folder to Platform-tools. So, you would type the following commands to get into the platform-tools folder:

    C:\Users\> cd Platforms-tools

    List of connected devices:

    C:\Users\\Platforms-tools> ADB devices

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    When Do You Get This Error

    If you are a Mobile tester, this type of error will show up when,

    • Application is in the developing phase

    • The application is being used by users or on server crashes.

    Having said this, sometimes the Crash error occurs randomly. For instance, if you are testing a mobile application and suddenly you faced Unfortunately application stopped and you will try to reproduce the same error but you fail.

    We are not sure, as an Android application will not get a crash in the production environment since you were not able to take the logs of the random crash.

    Dont worry, you can easily get the logs of android application crashes and show them to a developer so that they can easily fix the crashes on time and the user will not be able to face the crash error in the production environment.

    Android Crash Log Errors: Explained

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    Crashes on Android can be immensely frustrating for users, so much so that after experiencing as little as two crashes, the typical user will uninstall your app. Fortunately, the Android Framework provides some great tools for debugging crashes, and provides several useful crash logs that developers can read to determine what caused that critical issue. In this blog post weâll cover the three most important crash logs used by the system: exception stack traces, ANR traces, and NDK tombstones.

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    In This Article Gain A Basic Understanding Of The Android Log System

    Android uses a centralized system for all logs and application programmers can also write custom log messages. The tooling to develop Android applications allows you to define filters for the log statements you are interested in. Log analysis is a phase of development and developers encounter it from time to time. Bug log helps in identifying the bugs in the Android application while in the development phase. Once the app is released into the market, the support engineers analyze the bug logs to resolve the issue. There are for different types of Logs available in the Android Eco-System Application Logs, Android System Logs, Event Logs, and Radio Logs.

    The logging system consists of a kernel driver and kernel buffers for storing Android log messages, C, C++ and Java classes for making log entries and for accessing the log messages, a standalone program for viewing log messages and the ability to view and filter the log messages from the host machine .

    There are four different log buffers in the Linux kernel, which provide logging for different parts of the system. Access to the different buffers is via device nodes in the file system, in /dev/log. The four Android log buffers are main, events, radio and system. The main log is for the application, events is for system event information, radio is for phone-related information and system is low-level system messages and debugging.

    Easy Steps To Troubleshoot Secured Android Apps Using Adb

    Appdomes Diagnostic Logs features are also useful when troubleshooting secured Android apps using ADB.

  • Check with Appdome support to see if your account can enable Diagnostic Logs on app builds.
  • While Fusing/Building an app you can enable Diagnostic Logs at the bottom of the page.
  • Under Troubleshooting, enable Diagnostic Logs for the Build.
  • You can enable the ability to email or upload logs to Appdome support with a tap in the app within Diagnostic Logs.
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    How To Get Android Device Log On Windows 10

    • User

    Mobile devices and the apps that run on them run into trouble. If you develop apps for a mobile platform, you probably already know how to get the device log for Android phones and view whats causing a crash or bug. If youre an end-user, though, and you need to get an Android devices log, you will find that the process is complicated to follow with lots of tools that need to be installed. Heres a much simpler and just as effective method you can use to get an Android device log.

    Xda Basics: How To Take Logs On Android

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    Logs are very useful when a developer is diagnosing an error with a piece of software. So, as a user, when you complain to a developer about a problem with their Android app or an aftermarket firmware , theyll ask you to submit a log to help them troubleshoot the issue. Android includes a number of logs that deal with different parts of the firmware, and there are a number of ways to collect those logs. In this guide, well talk about the various common logs and how you can collect them on Android for bug reports.

    Before we start, you should set up Android Debug Bridge on your computer as you might need ADB access for some of these logs. We have a great guide on how to set up ADB on any computer.

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    Control Log Output Format

    Log messages contain a number of metadata fields, in addition to the tag and priority. You can modify the output format for messages so that they display a specific metadata field. To do so, you use the -v option and specify one of the supported output formats listed below.

    • brief: Display priority, tag, and PID of the process issuing the message.
    • long: Display all metadata fields and separate messages with blank lines.
    • process: Display PID only.
    • raw: Display the raw log message with no other metadata fields.
    • tag: Display the priority and tag only.
    • thread: A legacy format that shows priority, PID, and TID of the thread issuing the message.
    • threadtime : Display the date, invocation time, priority, tag, PID, and TID of the thread issuing the message.
    • time: Display the date, invocation time, priority, tag, and PID of the process issuing the message.

    When starting logcat, you can specify the output format you want by using the-v option:

     logcat 

    Here’s an example that shows how to generate messages in thread output format:

    adb logcat -v thread

    Note that you can only specify one output format with the -v option, but you can specify as many modifiers that make sense. Logcat ignores modifiers that do not make sense.

    Get Reports From Your Users

    Capturing bug reports as described above is helpful as you’re using the appyourself, but your end-users can’t easily share these types of bug reportswith you. To get crash reports with stack traces from real-world users,you should take advantage of Google Play’s and Firebase’s crash reportingfeatures.

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    Controlling Log Output Format

    Log messages contain a number of metadata fields, in addition to the tag and priority. You can modify the output format for messages so that they display a specific metadata field. To do so, you use the -v option and specify one of the supported output formats listed below.

    • brief Display priority/tag and PID of the process issuing the message .
    • process Display PID only.
    • tag Display the priority/tag only.
    • raw Display the raw log message, with no other metadata fields.
    • time Display the date, invocation time, priority/tag, and PID of the process issuing the message.
    • threadtime Display the date, invocation time, priority, tag, and the PID and TID of the thread issuing the message.
    • long Display all metadata fields and separate messages with blank lines.

    When starting LogCat, you can specify the output format you want by using the-v option:

     logcat 

    Here’s an example that shows how to generate messages in thread output format:

    adb logcat -v thread

    Note that you can only specify one output format with the -v option.

    Prerequisites For Troubleshooting Secured Android Apps Using Adb

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    In order to use ADB, youll need:

    • Android SDK. Make sure that platform-tools have included ADB in this package.
    • USB Driver for the mobile device
    • Android app that has enabled diagnostic logs

    To facilitate the usage of ADB, you need to allow USB debugging on your device:

  • Enable Developer Options on the Android Device.
  • Navigate to Settings> About Phone> scroll to the bottom > tap Build number seven times.
  • Youll get a short pop-up in the lower area of your display saying that youre now a developer.
  • Navigate to Settings > Advanced > Developer options.
  • Check USB debugging and click OK on the prompt.
  • When the device is connected to the computer, you should be prompted to Allow USB debugging. If so, check the box to Always allow from this computer.
  • Click OK. If you do not see the message appear on your mobile device, disconnect and reconnect the USB cable.
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    Different Types Of Logs And What They Contain

    Android has a centralized system of all logs, and these logs are available in different categories, which allows the users and the application programmers to look for a particular filter for the log statement.

    The log analysis helps the developers to find the fault in a log and develop the application from time to time. Different types of logs available in Android are Application log, System log, Event log, Radio log.

    How Do I Change Permissions On Android

    Change app permissions

  • On your phone, open the Settings app.
  • Tap Apps.
  • Tap the app you want to change. If you cant find it, tap See all apps.
  • Tap Permissions. If you allowed or denied any permissions for the app, youll find them here.
  • To change a permission setting, tap it, then choose Allow or Dont allow.
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    How To View And Examine Android Logs

    Yoodley is reader-supported. When you buy through links on our site, we may earn an affiliate commission.

    If you are looking to learn how to obtain and examine android logs, this is just the post for you. Log analysis is important to recognize bugs and obstructions in an application-in-making which is provided by a set of logs. Lets start with the basics first, however.

    Log Viewer Tools For Android

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    Log Viewer Tools for the android are lightweight apps for viewing text files.

    If you are a mobile application developer I am sure you are aware of how difficult debugging parts of applications can be.

    Hence, the great importance of Android Log Viewers because it simplifies the analysis of android logs.

    General Features of Log View Apps:

    Open files from local storage or directly from attachments/downloads. Search text. Optional word wrap.

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    Read Android Device Logs From My Android Application

    I want to get logs of the whole device, the way logcat shows the processes running in the device.I want to capture it from within my android application.

    • egorikemAug 23, 2018 at 9:38
    • These links only provide logs of my app. I basically want the system logs so that when any other app which is present in my device crashes, then I want to know its cause and app name. surbhi vermaAug 23, 2018 at 17:03
    • You can’t get those, unless you are either rooted or have your app as a system app. Because the READ_LOGS permission is a system level permission as described here.

    Your app needs to use the permission android.permission.READ_LOGS. .

    and you need to grant the permission to your app in runtime to access this permission with:

    adb shell pm grant < pkg> android.permission.READ_LOGS

    programmatically with:

    Runtime.getRuntime.exec

    Then you will be able to get the system logs using shell commands for logcat.For example, to get a logcat dump as a txt file in the device:

    Runtime.getRuntime.exec

    will get the logs saved in a txt file in the android device , using which further validation can be done.

    Accessing The Debug Log From Visual Studio

    The following screenshot illustrates the various parts of the DebugTool window:

    • Device Selector â Selects which physical device orrunning emulator to monitor.

    • Log Entries â A table of log messages from logcat.

    • Clear Log Entries â Clears all current log entries from the table.

    • Play/Pause â Toggles between updating or pausing thedisplay of new log entries.

    • Stop â Halts the display of new log entries.

    • Search Box â Enter search strings in this box to filter for a subsetof log entries.

    When the Debug Log tool window is displayed, use the device pull-downmenu to choose the Android device to monitor:

    After the device is selected, the Device Log tool automatically addslog entries from a running app â these log entries are shown inthe table of log entries. Switching between devices stops andstarts device logging. Note that an Android project must be loadedbefore any devices will appear in the device selector. If the devicedoes not appear in the device selector, verify that it is available inthe Visual Studio device drop-down menu next to the Start button.

    To open the Device Log, click View > Pads > Device Log:

    The following screenshot illustrates the various parts of the Debug Tool window:

    When the Debug Log tool window is displayed, use the device pull-downmenu to choose the Android device to monitor:

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