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Singleton in Kotlin

By : M.Bowman
Date : September 18 2020, 04:00 AM
it should still fix some issue if you use an object instead of a class you may have better luck
code :
object MySingleton {
    val thingA = 0

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Singleton with parameter in Kotlin

By : Seenu
Date : March 29 2020, 07:55 AM
it should still fix some issue Here's a neat alternative from Google's architecture components sample code, which uses the also function:
code :
class UsersDatabase : RoomDatabase() {

    companion object {

        @Volatile private var INSTANCE: UsersDatabase? = null

        fun getInstance(context: Context): UsersDatabase =
            INSTANCE ?: synchronized(this) {
                INSTANCE ?: buildDatabase(context).also { INSTANCE = it }

        private fun buildDatabase(context: Context) =
                    UsersDatabase::class.java, "Sample.db")

Singleton serialization in Kotlin

By : j.jor
Date : March 29 2020, 07:55 AM
should help you out There is no way to reassign the global reference to a singleton with a new instance. At most you can write out the properties during serialization, and then on deserialization directly read the properties and mutate the state in the original object. It will require custom code for you to assign the properties into the object either by direct assignment or reflection. It would be better if you make your own singleton mechanism that holds an instance that you can swap out to be another instance that you deserialize.

Getting a Singleton in Kotlin

By : Rickard Hansson
Date : March 29 2020, 07:55 AM
I wish this helpful for you There's a great answer here for why the field should be volatile. Essentially, without it, it's possible for one thread to get a reference to the instance before it has been fully constructed.
For the getInstance() function, you have:
code :
instance ?:
synchronized(this) {
    instance ?:
CarRepository(carDao).also { instance = it }
fun getInstance(carDao: CarDao): CarRepository {
    var cachedInstance = instance
    if (cachedInstance != null) {
        return cachedInstance

    synchronized(this) {
        cachedInstance = instance
        if (cachedInstance == null) {
            cachedInstance = CarRepository(carDao)
            instance = cachedInstance
        return cachedInstance
val carDao1 = CarDaoImpl1()
val carDao2 = CarDaoImpl2()

val carRepo1 = CarRepository.getInstance(carDao1)
val carRepo2 = CarRepository.getInstance(carDao2)

// carRepo2 actually points to carDao1!

Kotlin singleton: How to copy object from singleton

By : avak
Date : March 29 2020, 07:55 AM
may help you . I would argue that mutating an object in this way should be avoided at all costs.
Luckily, Kotlin allows to achieve that using data classes with only value members:
code :
data class Food(val foodID: Int, 
             /* probably more fields here */)
return foodEntity.copy(foodID= 7)

Which is static and which is singleton in kotlin?

By : Abu Umar
Date : March 29 2020, 07:55 AM
To fix the issue you can do From official Kotlin docs:
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