Why are Log.d() and Log.v() not printing

问题

I have the following test code in my Activity:

@Override
public void onStart() {
    super.onStart();
    Log.e(CLASS_NAME, "ERROR onStart()");
    Log.w(CLASS_NAME, "WARN onStart()");
    Log.i(CLASS_NAME, "INFO onStart()");
    Log.d(CLASS_NAME, "DEBUG onStart()");
    Log.v(CLASS_NAME, "VERBOSE onStart()");

On the logcat view in Android Studio, it only prints:

02-10 15:56:10.190    6194-6194/org.example.my_app E/MyActivity﹕ ERROR onStart()
02-10 15:56:10.190    6194-6194/org.example.my_app W/MyActivity﹕ WARN onStart()
02-10 15:56:10.190    6194-6194/org.example.my_app I/MyActivity﹕ INFO onStart()

On top of the box, the menu is set to Log level: “Verbose”, and if I go into the menu next to it, choose “Edit filter configuration”, “by Log Level” is also set to “Verbose”. Why are the Log.d() and Log.v() not printing anything? What might I am missing? Any suggestions would be appreciated.

回答1:

Android Studio filters lines that have already been logged but Log itself may filter some levels when logging. See Log.isLoggable:

The default level of any tag is set to INFO.

(However on many phone it is actually set to DEBUG or VERBOSE.)

回答2:

Accepted answer not working

My solution:

when your Log.d is not working then Log.wtf is work

It's working for me, may be this is helpful to other, who find solution

回答3:

Fix For meizu phone

Settings -> Accessibility -> Developer options -> advanced logging->set "Allow all"

For Meizu MX4(Flyme 6.1.0.0), M2(Flyme 6.1.0.0G), M5(Flyme 6.3.0.0G) :

Settings->Accessibility - > Developer Options -> Performance optimization -> Advanced logging -> set "Allow all"

Huawei, logcat not showing the log for my app?

For other phone search in "developers options": option "logging" and set "all".

回答4:

Turn off your Developer Option then Restart Your Phone After that on developer option It definitely works by sure!!

回答5:

I was trying everything. From log.d to log.wtf. But nothing worked.

Then I restarted my Android Studio. After that, the debugger started working again.

Hope this helps to someone.

回答6:

I've faced also to the same issue. Even following the previous answers, I didn't find the way to show logs in the Logcat.

After many tries done on my own, here is the (other) way to get logs shown:

Just selecting "Show only selected application" in the combobox did the job. Priorly, it was "Firebase" which was selected.

Hopefully, you will see your logs ;-)

回答7:

For me the issue was that I had actually disabled the logger buffer in my developer settings so go to Settings -> Developer options -> Logger buffer size and set it to anything that isn't 'off'.

回答8:

This started happening with me in Android Studio 3. I was getting old Log.v's printing, but when I added a new one nothing happened. Ditto with debugger breakpoints.

Cleaning the solution and restarting Android Studio worked for me, but there was a simpler solution.

Disable Instant Run. It seems that Instant Run doesn't recognise new Log.v's or breakpoints.

Along the way I also added Gradle-aware Make to my Run/Debug configuration for the main activity. I don't know whether that was necessary, but I'm keeping it. ([Main Menu] Run -> Edit Configurations...)

来源：https://stackoverflow.com/questions/28434901/why-are-log-d-and-log-v-not-printing

标签

android-studio

logcat