Firebase Kotlin 与 Java 中的分析初始化

Question

I'm wondering why initialization of Firebase Analytics in Kotlin doesn't need context, but Java does need?

From documentation:

Java:
mFirebaseAnalytics = FirebaseAnalytics.getInstance(context);

Kotlin:
firebaseAnalytics = Firebase.analytics

Answer 1

The Kotlin version is an extension property. According to the docs :

@NonNull static fun getInstance(@NonNull context: Context): FirebaseAnalytics

Returns the singleton FirebaseAnalytics interface.

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While the analytics , which is an extension property:

val Firebase.analytics: FirebaseAnalytics

Returns the FirebaseAnalytics instance of the default FirebaseApp.