Develop Reference

Filter logs of given application in cmd not working

Note:
This question is a duplicate of Filter log messages by PID or application package in Android.
But there is no correct answer to that question & it is very very old.
I can't make any changes in the app codebase as suggested in the accepted answer, I can only access the app build.
As per Android Docs: https://developer.android.com/studio/command-line/logcat#alternativeBuffers
We should be able to filter logs of a given application using the command:
adb logcat --pid=<pid>
--pid= ... Only print logs from the given PID.
But I am getting an error "unrecognized option" when I enter it in cmd.
Got PID of application using:
adb shell ps <app-package-name>
Note: Want a solution without using cmd alone, not using Android Studio.

For adb --pid command to work , the device/emulator in which you have tired capturing the logcat messages should atleast be Android 7.0 . Otherwise this command will not work.
if you have device with android 7.0 above , then try this command
adb logcat --pid=19816 *:D
replace your pid value and * means (any tag) : D meas DEBUG severity log messages
if you have device which is older versions , you can search specific logcat messages based on your package name string or given tag strings like this
adb logcat | findstr <PACKAGENAME OR TAGS>

How to clear android app log message programmatically?

In my android app, I read my Log messages. After reading the log message I want to clear it. So I tried following code for clearing the app's log .
ProcessBuilder().command("logcat", "-c").redirectErrorStream(true).start()
Runtime.getRuntime().exec(arrayOf("logcat", "-c"))
Runtime.getRuntime().exec("logcat -c")
Runtime.getRuntime().exec("logcat -b all -c")
But above code is not cleared the log message. But whenever I used adb logcat -c from PC's command prompt it works properly. So how to clear the logs pro grammatically in android.

There is no way u can write a code to clear the logcat in Android Studio but there is a way u can clear logcat every time u run an app.
Follow these steps:
1. RUN
2.Edit Configuration
3. Then when the "Run/Debug Configurations" dialog shows up, click the Logcat tab (now called Miscellaneous in Android Studio 2.x)(idk about if u are in the latest version)
4. U will see a "Clear log before launch" checkbox, now click on it check it.
5. Ur logcat output will be cleared before each new run in Android Studio.
Hope this helped u.

Eclipse - Empty Logcat with Android 7

I recently updated my Nexus 9 Tablet to Android 7 Nougat.
Since then the Logcat view in Eclipse stoped displaying Logcat messages, the view just stays empty.
Also the devices target is shown as "Unknown".
If I instead start Logcat outside Eclipse (AndroidSDK->tools->ddms) it displays all messages. However, then the "Application" Column stays empty.
There are allready some (older) questions on this topic here on SO, but none of the solutions here worked for me.
What i tryed:
Use another USB Port
Focus the device in the DDMS perspective
Restart Eclipse
Reboot the device + pc
abd kill-server
disable and re-enabled USB Debuging on the device
Reset the USB-Debuging authorization and confirm the RSA fingerprint again
Switch USB-Mode to "MTP"
Every installed package from the Android SDK is up to date and i use latest Eclipse+ADT Plugin.
Also everything works fine with my Galaxy S5 Mini (Android 5.1.1).
I know, that the ADT-Plugin is deprecated and we should use Android Studio.
However I still preffer to use Eclipse as long as possible, so I am looking for a solution for this problem.
So does anyone know how to solve this issue?

I tried with this custom build and it works for me. Now I can see my logcat in Eclipse again.
https://github.com/khaledev/ADT/releases
Download the zip file then in Eclipse menu Help > Install New Software... > Add > Archive...
Just pick the downloaded zip and do the rest of the install process.

can use "Android Device Monitor" Application,
This application in the sdk-tools package.
Launch From the command line,
cd to the "sdk-tools folder/tools/" directory,
enter the following command : monitor.
or
windows environment,
open the directory "sdk-tools folder/tools/",
and double click monitor.bat.
detail -> Google User Guide

I had the same problem. Eventually, I found out that the "Eclipse IDE for Android Developers" was out of date. Updating this feature fixed the problem. Procedure:
Open Help -> About Eclipse -> Installation Details
Select "Installed Software" tab
Select "Eclipse IDE for Android Developers"
Click "Update" in the bottom.

Try to launch directly sdk tool monitor from Android SDK, it can be found in:
sdk-tools folder/tools/
you'll see monitor.bat, click on it to launch Android Device Monitor oustside Eclipse, don't forget to create a filter for your APP, go to logcat window-> Saved filters -> + -> fill your app name in "by Aplication Name"
If nothing works, in an emergency, you may try this to get logcat over command line (use cmd in windows), type :
adb logcat --pid=YOUR_APP_PID_NUMER
this shows messages from your APP. if you don't know your PID, put a line in your APP code:
System.out.println("foo stuff I can find easily when I read logcat results");
Run your app, make sure you get the up line executed.
Then in your command line type:
adb -d logcat System.out:I *:S
Find your line System.out.println("foo... and read the PID number, is next right to time data.
And then
adb logcat --pid=pid number you read from your comment line
to get logcat messages from your app in the command shell in real-time.
If you just want messages output till now, just add -d modifier:
adb -d logcat --pid=pid number you read from your comment line

How to check Android Log in Window's Terminal?

I am working in an Android Project. I want to see Logs in Window terminal rather than in Android's Logcat.Any suggestion?. I put Logger in my project for example:
Log.d("ufo","Plane inventory Listener is called");
I also want to see Logs of "ufo" in window's terminal?

You need to read logcat documentation for details.
You can see log messages into terminal using below command
To see all logs
adb logcat
Filter logs (like you want to see logs for ufo)
adb logcat | grep "ufo"

Android where is log for file for application on device?

I am running a custom android application. inside that application I have various Log statements.
Log.i(TAG, "I am in activityA") etc. Which log file and directory location will this log file appear in. Will it print to the log file on device and if so which one? Thanks Also where do I set levels which will print? I assume Log.d(TAG, "") will not appear on device logs since it needs to be in debug mode ... Also where to set log levels for deployed app in manifest?

You can use logcat to view the logs.
You can run logcat as an adb command : Open a command windw on your PC and type
$ adb logcat
(OR)
$ adb shell
# logcat
(OR)
You can execute it directly from the shell prompt of your target device.