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>

To get complete logs of 2 devices using adb

I am testing an app with 2 devices communicating using sockets and monitoring the timestamp values. I select the required device name from the DDMS perspective. But some initial logs are missing(as I have many Log.d statements in the code). I want to store the whole log file after I stop apps in both the phones. Can someone tell me how this can be done in command line using adb? I couldn't find any example for 2 devices.
Thanks

You can try with two console and get logcat separately for two devices
Get serial no for each devices using adb devices
and save logcat as text files
console 1: adb -s <device1serialNO> logcat -d > logcat1.txt
console 2: adb -s <device2serialNO> logcat -d > logcat2.txt
You can filter result for your given tag if needed

Before launching your application you can start the following command in your terminal:
adb logcat <your_application_log_tag>:V *:S > file.txt
<your_application_log_tag> is a log tag that you use in your application. *:S means that you suppress all log outputs from other components. > file.txt redirects the output of the command to file.txt.
The cause of the problem is that for logging Android has a buffer in RAM and if it becomes full it rewrites the most old entries (FIFO). The command I've provided will store the log on your computer.

Logcat displays nothing when used from Runtime.exec

I'm running the command
logcat -d AndroidRuntime:E *:S
When ran from adb on my computer, it displays all the things it should. When I try to run it from an Android application with
Runtime.getRuntime().exec("logcat -d AndroidRuntime:E *:S");
and print the output, it won't display anything except the headers.
How can I fix this?

First, this has never been supported.
Second, if you are running on Android 4.1 and later, you will only get any log messages that your own app logs, not messages from other apps, as you can no longer hold the READ_LOGS permission in an ordinary SDK app.

Running android project on device from eclim

I want to use ECLIM plugin for VIM during android development.
The main problem : I can't run my project from eclim, so I can't see logs and errors.
I know such command :
:Ant debug install
This command compiles and updates my project to connected device. I have to run it manually.
I'm not lazy, and is not problem to run it.
But I wish to see runtime's Logs.:)

open a terminal,and input adb logcat，then you can see the log.
have a try :)

If you want to see it exclusively within vim then :!adb logcat will display the logs.

Use this in vim:
:!ant debug install && adb shell am start -n your.package.name/.YourActivityName
That will fire up the app in your device. For logging I just want to complement that if you log in your app use a tag and filter the log by a tag like so: adb logcat -s "tagname"

Android: Where log cat goes while running on device?

I'm using Eclipse on mac for developing android apps.
When I run the application on emulator the log cat window shows what is expected and do work fine but when I run(or even debug) on real android connected device my log cat window doesn't show even a single line.
How to deal with log cat when running on real android devices?
Thanks,

You have to select the device in the DDMS environment, Windows tab, select "Devices", and then select your device, i.e. "HtXXXXXXX".

First, Is device really connected? To check whether the device is connected or not, just run adb devices on console. It will list all the devices attached to the system.
Second, just run the adb logcat command at the command prompt, it will display the logcat window separately.
While many devices are attached to a system, adb logcat will display the following message:
- waiting for device -
error: more than one device and emulator
so to resolve above case, you have to run the command with device id with -s option.
For example:
adb -s emulator-5556 logcat , this will display the logcat for emulator.

Try just to restart it when you connected to device.