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I have an util Kotlin class where I set toolbar title, hide or show toolbar depends on the fragment:
class MyToolbarUtils() {
fun hideToolbar(activity: Activity) {
(activity as MainActivity).supportActionBar!!.hide()
}
fun showToolbar(activity: Activity, tag: String) {
setToolbarTitle(tag, activity)
(activity as MainActivity).supportActionBar!!.show()
}
fun setToolbarTitle(tag: String, activity: Activity) {
var title = ""
when (tag) {
"Main_fragment" -> title = activity.resources.getString(R.string.Main_screen)
"Add_note" -> title = activity.resources.getString(R.string.Add_note)
}
activity.title = title
}
}
how to call showToolbar(...) from Fragment?
I just tried MyToolbarUtils.showToolbar(..) but it can not be possible
only one way I discover is:
val setToolbarTitle = MyToolbarUtils()
setToolbarTitle.showToolbar(activity, tag)
but there must be better way to do that..
244
Before you can use (call) a function, you need to define it. To define a function in Kotlin, fun keyword is used. Then comes the name of the function (identifier). Here, the name of the function is callMe .
In Kotlin, You can pass a variable number of arguments to a function by declaring the function with a vararg parameter. a vararg parameter of type T is internally represented as an array of type T ( Array<T> ) inside the function body.
:: is just a way to write a lambda expression basically we can use this to refer to a method i.e a member function or property for example class Person (val name: String, val age: Int) Now we can write this to access the person which has the maximium age.
Convert your class into an object which is supposed to work similarly to java static methods.
You can get more info here: https://kotlinlang.org/docs/reference/object-declarations.html#object-declarations
149
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