Kotlin Standard Library Cookbook

How to do it...

1. Declare the LifecycleAwareLazy class:

class LifecycleAwareLazy<T>(lifecycle: Lifecycle, val initializer: () -> T):             Lazy<T>, GenericLifecycleObserver

2. Register an observer to the given Lifecycle instance inside the init block:

class LifecycleAwareLazy<T>(lifecycle: Lifecycle, val initializer: () -> T):             Lazy<T>, GenericLifecycleObserver {    init {        lifecycle.addObserver(this)    }}

3. Implement an internal field that represents the current value stored by the delegate:

class LifecycleAwareLazy<T>(lifecycle: Lifecycle, val initializer: () -> T):             Lazy<T>, GenericLifecycleObserver {    init {        lifecycle.addObserver(this)    }        private object UNINITIALIZED_VALUE    private var _value: Any? = UNINITIALIZED_VALUE}

4. Implement the value property ...