Kotlin Android print to console

Question

I need to print some str to console (Android Studio) using Kotlin. I\'ve tried the:

Log.v() 
Log.d() 
Log.i() 
Log.w() 
Log.e() 

methods. But i

Answer 1

You can use Anko library to do it. You would have code like below:

class MyActivity : Activity(), AnkoLogger {
    private fun someMethod() {
        info("This is my first app and it's awesome")
        debug(1234) 
        warn("Warning")
    }
}

or you can also use this small written in Kotlin library called StaticLog then your code would looks like:

Log.info("This is an info message")
Log.debug("This is a debug message")
Log.warn("This is a warning message","WithACustomTag")
Log.error("This is an error message with an additional Exception for output", "AndACustomTag", exception )

Log.logLevel = LogLevel.WARN
Log.info("This message will not be shown")\

The second solution might better if you would like to define an output format for logging method like:

Log.newFormat {
    line(date("yyyy-MM-dd HH:mm:ss"), space, level, text("/"), tag, space(2), message, space(2), occurrence)
}

or use filters, for example:

Log.filterTag = "filterTag"
Log.info("This log will be filtered out", "otherTag")
Log.info("This log has the right tag", "filterTag")

If you already used Jake Wharton's Timber logging library check this project: https://github.com/ajalt/timberkt.

Check also: Logging in Kotlin & Android: AnkoLogger vs kotlin-logging

Hope it will help