Adb logcat - how does it work?

[Gian_Luca]

hi guys good morning, can anyone explain in detail how adb logcat works to find errors in apps?

[Anu10 (Anu)]

Capturing Device Logs using adb logcat

[dora_paz (Dora)]

Also see

App Automatically close after splash screen

off-topic When you uses adb to find the crash logs then it’s sometimes difficult to find them as there are a lot of logs shown. So here you can search for a particular text in your logs this way. Run adb logcat | findstr AndroidRuntime. Above command will search for AndroidRuntime in logcat and this will show you the filtered logs that contains AndroidRuntime in tag or logs. You can search anything with findstr. For ex, If you want to get logs of only your apps then run adb logcat | findstr…

[Xoma (Kumaraswamy)]

This is how you run it for silent logs:

adb logcat -s <Name>

Filter only the errors out:

adb logcat -e <Name>

Print all text in the logcat live:

adb logcat

To install that, go to Android developers page, download that, add the “bin” directory path to PATH env and it is done.

[Gian_Luca]

@Xoma
add the “bin” directory path to PATH env and it is done.

I don’t know how to do this. Can you be clearer? thank you

[Xoma (Kumaraswamy)]

when you download platform tools (adb) you will extract it, you will find a “bin” directory inside that, go into that, copy the path and then add the path to Environment Variables (user/global)

[dora_paz (Dora)]

You can download adb from Downloads - ADB Shell

If you wish there is no need to add to bin. Unzip file to a folder, go to that folder, click on bar, type cmd and a command prompt window will open. Then you can start logcat

[Gian_Luca]

@dora_paz
perfect, now how do i spot errors?
The screen looks like a matrix to me

[Rogerio_Rios (Professional Support)]

Did You try CTRL+C ?

[Gian_Luca]

@Rogerio_Rios
Did You try CTRL+C ?

to see the errors?

[dora_paz (Dora)]

If you want to get logs of only your apps then run adb logcat | findstr {PACKAGE_NAME} and this will show you the logs that contains your application package. Easier to isolate error

[Rogerio_Rios (Professional Support)]

@Gian_Luca

to see the errors?

To stop "matrix screen’…

[Gian_Luca]

@dora_paz
If you want to get logs of only your apps then run adb logcat | findstr {PACKAGE_NAME} and this will show you the logs that contains your application package. Easier to isolate error

if I type adb logcat | findstr {PACKAGE_NAME} I have as answer unable to open CHAT

[dora_paz (Dora)]

Unless you provided a custom package name from project settings then package name of your app will be in the form of io.kodular.your_email.yourappname

[Yusup_Rismunawar]

if it show something like this, whats is the problem and what the solution ? because my apk is just force closed

[Xoma (Kumaraswamy)]

Look from the line java.lang.NullPointerException: Attempt to invoke... its a Kodular Web View Bug.

[Yusup_Rismunawar]

thank you for the answer, do you have any suggestion ?