Unable to change value of an initialised primitive type using Kotlin

Question

I can't change the value of an initialised variable.

I tried googling the problem to no avail. Float is a primitive type so it cannot be lateinit.

class RegistrationActivity : AppCompatActivity() {

    val scale = 0f

    public override fun onStart() {
        super.onStart()
        scale = this.resources.displayMetrics.density
    }
}

I expect to be able to initialise the "scale" variable outside of a method body so that it can be used by other methods, but in my attempt I'm met with the "Val cannot be reassigned" as an error inside of the "onStart()" method when I hover over "scale" in "scale = this.resources.displayMetrics.density".

Margaro Martínez · Accepted Answer · 2019-11-05T22:49:10.607

2

You need to use

var scale = 0f

instead of

val scale = 0f

val is immutable and it can not change over the time

var can change over the time

If you came from java.

val scale = 0f will be the equivalent for

final float scale = 0f;

edited Nov 05 '19 at 22:49

answered Nov 05 '19 at 22:43

Margaro Martínez

90
9

You should check out this https://stackoverflow.com/questions/44200075/val-and-var-in-kotlin – Margaro Martínez Nov 05 '19 at 22:44
1

Thank you. Just started practicing Kotlin after Java since 2 days ago. – Gandeloft Nov 05 '19 at 22:46

Unable to change value of an initialised primitive type using Kotlin

1 Answers1