kotlin - 我可以使用null代替Kotlin中的isInitialized吗？

以下代码A来自项目play-billing-samples。

我可以在Kotlin中使用null代替isInitialized吗？就像代码B

代码A

lateinit private var localCacheBillingClient: LocalBillingDb

val inappSkuDetailsListLiveData: LiveData<List<AugmentedSkuDetails>> by lazy {
    if (::localCacheBillingClient.isInitialized == false) {
          localCacheBillingClient = LocalBillingDb.getInstance(application)
    }
     ...
}

代码B

lateinit private var localCacheBillingClient: LocalBillingDb

val inappSkuDetailsListLiveData: LiveData<List<AugmentedSkuDetails>> by lazy {
    if (localCacheBillingClient == null) {
          localCacheBillingClient = LocalBillingDb.getInstance(application)
    }
    ...
}

最佳答案

是的，可以，但是您必须将变量的类型更改为LocalBillingDb?并摆脱lateinit修饰符:

private var localCacheBillingClient: LocalBillingDb? = null

val inappSkuDetailsListLiveData: LiveData<List<AugmentedSkuDetails>> by lazy {
    if (localCacheBillingClient == null) {
          localCacheBillingClient = LocalBillingDb.getInstance(application)
    }
    ...
}