Using adb logcat with a real phone (and not the emulator)

when I'm using the Android emulator I can do "adb logcat" to see output messages (log / system.out.println) originated from my code. It also shows the stack trace of exceptions which happen during execution.

But, when I'm using a real phone, "adb logcat" does not do / show anything.

I also tried "adb -d logcat" which also does not display anything.

Is there any way to get it working with the real phone?

Thanks.

UPDATE:

I just tried "adb -s ? logcat" ('?' is the serial number of the device) and also got no results.

I tried another "adb" command to see if anything was working: "adb -s ? bugreport". This printed a lot of stuff. Example: "Memory Info", "CPU Info" and some Java specific things. So it seams that some stuff is working.

Solution 1:

1. Enable USB debugging on your device.

2. Connect the device to computer

3. Use these commands:

Get the "device id"

adb devices

example:

$ adb devices
List of devices attached
5856423841563398    device
emulator-5554   device

To specify the device when using logcat

adb -s "device id" logcat

example:

$ adb -s 5856423841563398 logcat
--------- beginning of crash
03-31 15:56:51.174 13547 13547 E AndroidRuntime: FATAL EXCEPTION: main

Solution 2:

Don't forget to check Settings -> Applications -> USB debugging. Then

 $ adb -d logcat

will show log messages.

Solution 3:

1. Get list of devices:

   adb devices

You will get this:

List of devices attached
emulator-5554   device
0123456789ABCDEF        device

1. Run log with parameters like this:

   adb -s "0123456789ABCDEF" logcat MyTag:D *:S

where "MyTag" is tag used in Log.d("MyTag", value) or you will get too many text.

Solution 4:

This is the best way to use LogCat via command line:

adb logcat -v time > log.txt