How to Implement a Static Initialization Block Equivalent in Kotlin?

How can I implement behavior similar to a static initialization block in Kotlin?

In Kotlin, while there is no direct equivalent to Java's static initialization blocks, you can achieve similar behavior utilizing companion objects and application lifecycle methods. This is particularly useful for specific tasks like enabling the DayNight feature in Android using AppCompat.

class MyApplication : Application() {
    companion object {
        init {
            // This code will run when the class is loaded
            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
        }
    }

    override fun onCreate() {
        super.onCreate()
        // Additional initialization can be done here
    }
}

Solutions

• Utilize a companion object to execute code when the class is first referenced. This allows you to run initialization code that acts similarly to a static block.
• Implement the `onCreate` method in your Application subclass to perform initialization tasks during the application's startup.

Mistake: Trying to use static properties or methods as in Java.

Solution: Use companion objects to define properties and methods that will behave like static.

Mistake: Not placing initialization code in the appropriate lifecycle method.

Solution: Make sure to initialize critical application settings in the `onCreate` method of your Application class.