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@hluhovskyi hluhovskyi/medium_15.kt
Last active Sep 11, 2017

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class StringDelegate : ReadOnlyPropery<Any, String> {
private val stringRes: Int
private val contextProvider: () -> Context
private var string: String? = null
constructor(contextProvider: () -> Context, @StringRes stringRes: Int) {
this.contextProvider = contextProvider
this.stringRes = stringRes
override fun getValue(ref: Any, property: KProperty<*>): String {
if (string == null) {
string = contextProvider().getString(stringRes)
return string ?: throw IllegalStateException()
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