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I wanted to know how I define a static variable in Kotlin that can be used in other classes that do not final . Because the data is changing

Example java:

public static  Boolean ActivityIsRuning = false;

There are three ways to achieve this:

1) Top-level / global declaration

Declare a variable outside of any class or function and it will be accessible from anywhere:

var activityIsRunning = false

2) object (an out of the box singleton)

object StaticData {
    var activityIsRunning = false

Accessable like this:


3) Class with companion object (as Todd already suggested)

class Config {
    companion object {
        var activityIsRunning = false

Accessable like this:


public static Boolean in kotlin, a static variable in Kotlin that can be used in other classes that do not final . Because the data is changing Example java: public static Boolean ActivityIsRuning  One way in which the Kotlin language differs from Java is that Kotlin doesn't contain the static keyword that we're familiar with. In this quick tutorial, we'll see a few ways to achieve Java's static method behavior in Kotlin.

You can define static variables in the companion object of any class. If you make it a var instead of a val, it can change values:

class MyClass {
    companion object {
        var activityIsRunning: Boolean = false

From Java to Kotlin, Kotlin. fun hasItems() : Boolean { return true }. Single-Expression. Java. public Java. public class MyClass { public static void main(String[] args){ } }. Kotlin. kotlin-stdlib / kotlin / Boolean. On the JVM, non-nullable values of this type are represented as values of the primitive type boolean. Functions. Common. JVM. JS.

You have to create companion object for this. Your code in Kotlin would look something like this:

class Foo {

    companion object {
         lateinit var instance: Foo

    init {
        instance = this

Kotlin and static, not as easy as Java - Daniele Bottillo, public static final String KEY = "MyAwesomeKey"; }. If you try to convert this code automatically in Kotlin from Android Studio/IntelliJ, it will  class MyClass { public static int myMethod() { return 1; } } In Kotlin, we can write in below way. class MyClass { companion object { fun myMethod() : Int = 1 } } a companion is used as static in Kotlin.

Adding to @Todd and @Willi Mentzel, if you like to group those settings under a common area, you can use a top-level plain object.

object GlobalSettings{
    var isHomeActivityRunning = false
    var isDrinkingCocoCola = true

and this can be accessed anywhere in the code (inside an Activity, Service, or anywhere) like this:

if( GlobalSettings.isDrinkingCocoCola ){
    // do something
} else {
   GlobalSettings.isDrinkingCocoCola = false

Boolean, public void setFirstName(String firstName) { this. This rule applies for properties of any type, not just Boolean . public static non-final field in Singleton class. True. But that doesn’t mean that we can’t reap the benefits provided by static methods in Kotlin. There is a way around them. Let’s see how. The documentation of Kotlin recommends that you should use package-level functions if you want to follow DRY. This might seem a little odd if you have worked with Java because it’s not there in Java!

Calling Kotlin from Java, Boolean accessor methods (where the name of the getter starts with is and the name of public @interface MyNullable { } Note: the static members of these Java types are not directly accessible on the companion objects of the Kotlin types. So in this article we will learn how to create static members in kotlin. In java, we create static member as: class statik {static intcount; //constructor statik {count + +;} static voidgetCount {System. out. println ("No. of objects=" + count);}} public class ExStatic {public static void main (String [] args) {//object 1 new statik (); // object 2 new statik (); //method called using class name statik. getCount ();}} Output. No. of objects=2

Calling Java from Kotlin, Boolean.toString(boolean b) returns a String object representing the specified boolean. Boolean.toString() method public static String toString(boolean b)  Unlike Java or C#, Kotlin doesn’t have static members or member functions. Kotlin recommends to simply use package-level functions instead. If you need to write a function that can be called without having a class instance but needs access to the internals of a class, you can write it as a member of a companion object declaration inside that class.

Java.lang.Boolean.toString() Method, Syntax : public static boolean parseBoolean(String s) Parameters : s - the String containing the boolean representation to be parsed Returns : the boolean  How to create a user-defined function in Kotlin? Before you can use (call) a function, you need to define it. Here's how you can define a function in Kotlin: fun callMe() { // function body } To define a function in Kotlin, fun keyword is used. Then comes the name of the function .

  • When I use another class This error:1-> Cannot resolve symbol ActivityIsRuning , 2 and 3 -> ActivityIsRuning' has private access in ClassName
  • I found.. In the third case, This way the problem was resolved. "@JvmField var ActivityIsRuning = false" Is it standard?
  • adding @JvmStatic is not necessary. Pls note the difference between "ActivityIsRuning" and "activityIsRuning". use the latter. intellij should then prompt you for an import (class should be underlined and red) (The companion object and object need an import of the form packageA.packageB.Config /packageA.packageB.StaticData).
  • @dariushkiany note, that this is strictly for kotlin. you seem to mix it up with java (maybe?)
  • When I use another class This error:'ActivityIsRuning ' has private access in className
  • When I use another class This error:'ActivityIsRuning ' has private access in className