Agenda
Android: FireBase + Kotlin Part 1 (Remote Config)
Android: FireBase + Kotlin Part 2 (Firebase Firestore)
Android: FireBase + Kotlin Part 3 (Firebase Realtime Database)
Realtime Database
api 'com.google.firebase:firebase-database-ktx:$NewestVersion'Features
Get an instance of FirebaseDatabase
Kotlin
val database = FirebaseDatabase.getInstance()
val anotherDatabase = FirebaseDatabase.getInstance(FirebaseApp.getInstance("myApp"))Kotlin + KTX
val database = Firebase.database
val anotherDatabase = Firebase.database(Firebase.app("myApp"))Get the FirebaseDatabase for the specified url
Kotlin
val database = FirebaseDatabase.getInstance(url)Kotlin + KTX
val database = Firebase.database(url)Get the FirebaseDatabase of the given FirebaseApp and url
Kotlin
val database = FirebaseDatabase.getInstance(app, url)Kotlin + KTX
val database = Firebase.database(app, url)Convert a DataSnapshot to a POJO
Kotlin
val snapshot: DataSnapshot = ...
val myObject = snapshot.getValue(MyClass::class.java)Kotlin + KTX
val snapshot: DocumentSnapshot = ...
val myObject = snapshot.getValue<MyClass>()Convert a DataSnapshot to generic types such as List or Map
Kotlin
val snapshot: DataSnapshot = ...
val typeIndicator = object : GenericTypeIndicator<List<Message>>() {}
val messages: List<Message> = snapshot.getValue(typeIndicator)Kotlin + KTX
val snapshot: DocumentSnapshot = ...
val messages: List<Message> = snapshot.getValue<List<@JvmSuppressWildcards Message>>()Thanks: https://firebaseopensource.com/projects/firebase/firebase-android-sdk/docs/ktx/database.md/
