add extension on Log in android (Kotlin)

Question

I use this code to add extension for Log class android

fun Log.i2(msg:String):Unit{
    Log.i("Test",msg)
}

when using in the activity

class MainActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        Log.i2("activity_main")
    }
}

Log.i2 not found. What's wrong?

Answer 1

To achieve extension function in static class, you need to write extension of the companion object(refer this)

fun Log.Companion.i2(msg:String) {
 ...
}

Answer 2

You have created Extension function of Class Log. Which is suppose to call by Instance of Class Log. You are trying to treat extension function as static and calling it by Class name. Which is not correct in the case