Jake Wilson Jake Wilson - 4 years ago 158
Android Question

Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?

The different

LogCat
methods are:

Log.v(); // Verbose
Log.d(); // Debug
Log.i(); // Info
Log.w(); // Warning
Log.e(); // Error


What are the appropriate situations to use each type of Logging? I know that perhaps it's just a little bit of semantics and perhaps it doesn't really matter, but for
LogCat
filtering in Android Studio and Eclipse, it would be nice to know I am using the proper methods at the appropriate times.

Answer Source

Let's go in reverse order:

  • Log.e: This is for when bad stuff happens. Use this tag in places like inside a catch statment. You know that an error has occurred and therefore you're logging an error.

  • Log.w: Use this when you suspect something shady is going on. You may not be completely in full on error mode, but maybe you recovered from some unexpected behavior. Basically, use this to log stuff you didn't expect to happen but isn't necessarily an error. Kind of like a "hey, this happened, and it's weird, we should look into it."

  • Log.i: Use this to post useful information to the log. For example: that you have successfully connected to a server. Basically use it to report successes.

  • Log.d: Use this for debugging purposes. If you want to print out a bunch of messages so you can log the exact flow of your program, use this. If you want to keep a log of variable values, use this.

  • Log.v: Use this when you want to go absolutely nuts with your logging. If for some reason you've decided to log every little thing in a particular part of your app, use the Log.v tag.

And as a bonus...

  • Log.wtf: Use this when stuff goes absolutely, horribly, holy-crap wrong. You know those catch blocks where you're catching errors that you never should get...yea, if you wanna log them use Log.wtf
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