Firebase Kotlin SDK GitHub last commit

The Firebase Kotlin SDK is a Kotlin Multiplatform SDK for Firebase, enabling you to use Firebase directly from your common source targeting iOS, Android, Desktop or Web, enabling the use of Firebase as a backend for Compose Multiplatform, for example. ## Available libraries The following libraries are available for the various Firebase products. | Service or Product | Gradle Dependency | API Coverage | |---------------------------------------------------------------------------------|:-------------------------------------------------------------------------------------------------------------------------------|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [Analytics](https://firebase.google.com/docs/analytics) | [`dev.gitlive:firebase-analytics:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-analytics/2.7.0/pom) | [![16%](https://img.shields.io/badge/-16%25-orange?style=flat-square)](/firebase-analytics/src/commonMain/kotlin/dev/gitlive/firebase/analytics/analytics.kt) | | [Authentication](https://firebase.google.com/docs/auth) | [`dev.gitlive:firebase-auth:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-auth/2.7.0/pom) | [![53%](https://img.shields.io/badge/-53%25-orange?style=flat-square)](/firebase-auth/src/commonMain/kotlin/dev/gitlive/firebase/auth/auth.kt) | | [Realtime Database](https://firebase.google.com/docs/database) | [`dev.gitlive:firebase-database:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-database/2.7.0/pom) | [![48%](https://img.shields.io/badge/-48%25-orange?style=flat-square)](/firebase-database/src/commonMain/kotlin/dev/gitlive/firebase/database/database.kt) | | [Cloud Firestore](https://firebase.google.com/docs/firestore) | [`dev.gitlive:firebase-firestore:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-firestore/2.7.0/pom) | [![23%](https://img.shields.io/badge/-23%25-orange?style=flat-square)](/firebase-firestore/src/commonMain/kotlin/dev/gitlive/firebase/firestore/firestore.kt) | | [Cloud Functions](https://firebase.google.com/docs/functions) | [`dev.gitlive:firebase-functions:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-functions/2.7.0/pom) | [![63%](https://img.shields.io/badge/-63%25-green?style=flat-square)](/firebase-functions/src/commonMain/kotlin/dev/gitlive/firebase/functions/functions.kt) | | [Cloud Messaging](https://firebase.google.com/docs/cloud-messaging) | [`dev.gitlive:firebase-messaging:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-messaging/2.7.0/pom) | [![5%](https://img.shields.io/badge/-5%25-orange?style=flat-square)](/firebase-messaging/src/commonMain/kotlin/dev/gitlive/firebase/messaging/messaging.kt) | | [Cloud Storage](https://firebase.google.com/docs/storage) | [`dev.gitlive:firebase-storage:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-storage/2.7.0/pom) | [![64%](https://img.shields.io/badge/-64%25-green?style=flat-square)](/firebase-storage/src/commonMain/kotlin/dev/gitlive/firebase/storage/storage.kt) | | [Installations](https://firebase.google.com/docs/projects/manage-installations) | [`dev.gitlive:firebase-installations:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-installations/2.7.0/pom) | [![100%](https://img.shields.io/badge/-100%25-green?style=flat-square)](/firebase-installations/src/commonMain/kotlin/dev/gitlive/firebase/installations/installations.kt) | | [Remote Config](https://firebase.google.com/docs/remote-config) | [`dev.gitlive:firebase-config:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-config/2.7.0/pom) | [![49%](https://img.shields.io/badge/-49%25-orange?style=flat-square)](/firebase-config/src/commonMain/kotlin/dev/gitlive/firebase/remoteconfig/FirebaseRemoteConfig.kt) | | [Performance](https://firebase.google.com/docs/perf-mon) | [`dev.gitlive:firebase-perf:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-perf/2.7.0/pom) | [![35%](https://img.shields.io/badge/-35%25-orange?style=flat-square)](/firebase-perf/src/commonMain/kotlin/dev/gitlive/firebase/perf/performance.kt) | | [Crashlytics](https://firebase.google.com/docs/crashlytics) | [`dev.gitlive:firebase-crashlytics:2.7.0`](https://search.maven.org/artifact/dev.gitlive/firebase-crashlytics/2.7.0/pom) | [![88%](https://img.shields.io/badge/-88%25-green?style=flat-square)](/firebase-crashlytics/src/commonMain/kotlin/dev/gitlive/firebase/crashlytics/crashlytics.kt) | Is the Firebase library or API you need missing? [Create an issue](https://github.com/GitLiveApp/firebase-kotlin-sdk/issues/new?labels=API+coverage&template=increase-api-coverage.md&title=Add+%5Bclass+name%5D.%5Bfunction+name%5D+to+%5Blibrary+name%5D+for+%5Bplatform+names%5D) to request additional API coverage or be awesome and [submit a PR](https://github.com/GitLiveApp/firebase-kotlin-sdk/fork) ## Multiplatform The Firebase Kotlin SDK provides a common API to access Firebase for projects targeting *iOS*, *Android*, *JVM* and *JS* meaning you can use Firebase directly in your common code. Under the hood, the SDK achieves this by binding to the respective official Firebase SDK for each supported platform. It uses the Firebase Java SDK to support the JVM target. The library requires [additional initialization](https://github.com/GitLiveApp/firebase-java-sdk?tab=readme-ov-file#initializing-the-sdk) compared to the official Firebase SDKs. ### Initialization `Firebase.initialize` is the one entry point for every platform, but what it does, and whether you need to call it at all, depends on how the underlying Firebase SDK is initialised: | Platform | `context` argument | Without `options` | With `options` | |----------|--------------------|-------------------|----------------| | Android | required, an `android.content.Context` | reads the resources generated by the Google Services Gradle plugin from `google-services.json` | uses the given options | | iOS | ignored | reads `GoogleService-Info.plist` (`FirebaseApp.configure()`) | uses the given options | | JS | ignored | not supported, throws `UnsupportedOperationException` | uses the given options (`authDomain` is JS only) | | JVM | required, an `android.app.Application` from the [Firebase Java SDK](https://github.com/GitLiveApp/firebase-java-sdk) | not supported | uses the given options | On Android you usually need no call: with the Google Services Gradle plugin the official SDK initialises the default app itself at startup (through a `ContentProvider` merged into your manifest) and `Firebase.app` is ready to use. On iOS the default app has to be configured once at launch, either from Swift with `FirebaseApp.configure()` or from Kotlin as shown below, before any Firebase API is used. On JS and the JVM the options always have to be provided in code. The recommended pattern is a common function that takes the options and an optional platform context, called from each platform's entry point: ```kotlin // commonMain fun initializeFirebase(context: Any? = null): FirebaseApp = Firebase.apps(context).firstOrNull() ?: Firebase.initialize( context, FirebaseOptions( applicationId = "1:846484016111:web:abc123", apiKey = "AIza...", projectId = "fir-kotlin-sdk", databaseUrl = "https://fir-kotlin-sdk.firebaseio.com", storageBucket = "fir-kotlin-sdk.appspot.com", gcmSenderId = "846484016111", authDomain = "fir-kotlin-sdk.firebaseapp.com", // JS only, ignored elsewhere ), ) ``` ```kotlin // androidMain, e.g. in Application.onCreate; only needed without the Google Services plugin initializeFirebase(applicationContext) // iosMain, e.g. from the app delegate or the SwiftUI App init; or pass no options to read GoogleService-Info.plist initializeFirebase() // jsMain, before any other Firebase call initializeFirebase() ``` On the JVM the [Firebase Java SDK needs its platform hooks installed](https://github.com/GitLiveApp/firebase-java-sdk?tab=readme-ov-file#initializing-the-sdk) before the app is created, and the `context` is the SDK's `Application` stand-in: ```kotlin // jvmMain FirebasePlatform.initializeFirebasePlatform(object : FirebasePlatform() { val storage = mutableMapOf() override fun store(key: String, value: String) = storage.set(key, value) override fun retrieve(key: String) = storage[key] override fun clear(key: String) { storage.remove(key) } override fun log(msg: String) = println(msg) }) initializeFirebase(Application()) ``` `Firebase.initialize(context, options, name)` initialises an additional named app and `Firebase.app(name)` returns it; `Firebase.apps(context)` lists the initialised apps and `FirebaseApp.delete()` removes one. The default app is named `FirebaseApp.DEFAULT_APP_NAME` on every platform, even though the underlying SDKs use different names for it. Code written against the Android SDK can keep using `com.google.firebase.Firebase.initialize(context, options)`: the same three overloads exist there with the context typed as `Any?`, following the rules above per platform. ### Using the Firebase Android SDK API from common code Alongside the Kotlin-first `dev.gitlive.firebase` API, the SDK ships the Firebase Android SDK API itself under its original `com.google.firebase` packages, as `expect` declarations implemented on every platform. Code written against the Android SDK (including `com.google.android.gms.tasks.Task` and its listeners) therefore compiles unchanged, without even changing imports, in common code targeting Android, iOS, JVM and JS: ```kotlin import com.google.firebase.installations.FirebaseInstallations import kotlinx.coroutines.tasks.await FirebaseInstallations.getInstance().getId() .addOnSuccessListener { id -> println("Installation id: $id") } .addOnFailureListener { e -> println("Failed: ${e.message}") } val token = FirebaseInstallations.getInstance().getToken(false).await().token ``` So far this layer covers `firebase-app` (`FirebaseApp`, `FirebaseOptions`, `Timestamp`, exceptions, `Task`, `Task.await()`) and `firebase-installations`; the other modules are migrated one by one. For a step-by-step walkthrough of moving Android SDK code into a shared module, including the compiler-guided replacement of the Android-only members, see [Migrating from the Firebase Android SDK](documentation/migrate-from-android.md). ### Accessing the underlying Firebase SDK In some cases you might want to access the underlying official Firebase SDK in platform specific code, for example when the common API is missing the functionality you need. For this purpose each class in the SDK has `android`, `ios` and `js` extension properties that hold the equivalent object of the underlying official Firebase SDK. For *JVM*, as the `firebase-java-sdk` is a direct port of the Firebase Android SDK, is it also accessed via the `android` property. These properties are only accessible from the equivalent target's source set. For example to disable persistence in Cloud Firestore on Android you can write the following in your Android specific code (e.g. `androidMain` or `androidTest`): ```kotlin Firebase.firestore.android.firestoreSettings = FirebaseFirestoreSettings.Builder(Firebase.firestore.android.firestoreSettings) .setPersistenceEnabled(false) .build() ``` ### Running on Android On android, some modules (`config`) require you to enable [Core library desugaring](https://developer.android.com/studio/write/java8-support#library-desugaring) if you have a *minSDK lower than API 26*. ### Running on iOS On iOS the official [Firebase iOS SDK](https://github.com/firebase/firebase-ios-sdk) is not linked as a transitive dependency. Therefore, any project using this SDK needs to link the actual Firestore SDK as well. This can be done through your preferred installation method (Cocoapods/SPM). Similarly, tests require linking as well. Make sure to add the required frameworks to the search path of your test targets. This can be done by specifying a `cocoapods` block in your `build.gradle`: ```kotlin cocoapods { pod("FirebaseCore") // Repeat for Firebase pods required by your project, e.g FirebaseFirestore for the `firebase-firestore` module. } ``` ## Kotlin-first design Unlike the Kotlin Extensions for the Firebase Android SDK this project does not extend a Java based SDK so we get the full power of Kotlin including coroutines and serialization!

Suspending functions

Asynchronous operations that return a single or no value are represented by suspending functions in the SDK instead of callbacks, listeners or OS specific types such as [Task](https://developer.android.com/reference/com/google/android/play/core/tasks/Task), for example: ```kotlin suspend fun signInWithCustomToken(token: String): AuthResult ``` It is important to remember that unlike a callback based API, waiting for suspending functions to complete is implicit and so if you don't want to wait for the result you can `launch` a new coroutine: ```kotlin //TODO don't use GlobalScope GlobalScope.launch { Firebase.auth.signOut() } ```

Flows

Asynchronous streams of values are represented by Flows in the SDK instead of repeatedly invoked callbacks or listeners, for example: ```kotlin val snapshots: Flow ``` The flows are cold, which means a new listener is added every time a terminal operator is applied to the resulting flow. A buffer with the [default size](https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.channels/-channel/-b-u-f-f-e-r-e-d.html) is used to buffer values received from the listener, use the [`buffer` operator](https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/buffer.html) on the flow to specify a user-defined value and to control what happens when data is produced faster than consumed, i.e. to control the back-pressure behavior. Often you are only interested in the latest value received, in this case you can use the [`conflate` operator](https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/conflate.html) to disable buffering. The listener is removed once the flow [completes](https://kotlinlang.org/docs/reference/coroutines/flow.html#flow-completion) or is [cancelled](https://kotlinlang.org/docs/reference/coroutines/flow.html#flow-cancellation).

Serialization

The official Firebase SDKs use different platform-specific ways to support writing data with and without custom classes in [Cloud Firestore](https://firebase.google.com/docs/firestore/manage-data/add-data#custom_objects), [Realtime Database](https://firebase.google.com/docs/database/android/read-and-write#basic_write) and [Functions](https://firebase.google.com/docs/functions/callable). The Firebase Kotlin SDK uses Kotlin serialization to read and write custom classes to Firebase. To use Kotlin serialization in your project add the plugin to your gradle file: ```groovy plugins { kotlin("multiplatform") version "1.9.20" // or kotlin("jvm") or any other kotlin plugin kotlin("plugin.serialization") version "1.9.20" } ``` Then mark your custom classes `@Serializable`: ```kotlin @Serializable data class City(val name: String) ``` Instances of these classes can now be passed [along with their serializer](https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#introduction-to-serializers) to the SDK: ```kotlin db.collection("cities").document("LA").set(City.serializer(), city) { encodeDefaults = true } ``` The `buildSettings` closure is optional and allows for configuring serialization behaviour. Setting the `encodeDefaults` parameter is optional and defaults to `true`, set this to false to omit writing optional properties if they are equal to theirs default values. Using [@EncodeDefault](https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-core/kotlinx.serialization/-encode-default/) on properties is a recommended way to locally override the behavior set with `encodeDefaults`. You can also omit the serializer if it can be inferred using `serializer()`. To support [contextual serialization](https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serializers.md#contextual-serialization) or [open polymorphism](https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism) the `serializersModule` can be overridden in the `buildSettings` closure: ```kotlin @Serializable abstract class AbstractCity { abstract val name: String } @Serializable @SerialName("capital") data class Capital(override val name: String, val isSeatOfGovernment: Boolean) : AbstractCity() val module = SerializersModule { polymorphic(AbstractCity::class, AbstractCity.serializer()) { subclass(Capital::class, Capital.serializer()) } } val city = Capital("London", true) db.collection("cities").document("UK").set(AbstractCity.serializer(), city) { encodeDefaults = true serializersModule = module } val storedCity = db.collection("cities").document("UK").get().data(AbstractCity.serializer()) { serializersModule = module } ```

Server Timestamp

[Firestore](https://firebase.google.com/docs/reference/kotlin/com/google/firebase/firestore/FieldValue?hl=en#serverTimestamp()) and the [Realtime Database](https://firebase.google.com/docs/reference/android/com/google/firebase/database/ServerValue#TIMESTAMP) provide a sentinel value you can use to set a field in your document to a server timestamp. So you can use these values in custom classes: In case using the Realtime Database: ```kotlin @Serializable data class Post( val timestamp: ServerValue = ServerValue.TIMESTAMP, ) ``` In case using Cloud Firestore: ```kotlin @Serializable data class Post( // `Timestamp.ServerTimestamp` is a `BaseTimestamp`, not a `Timestamp`, so declare the field as // `BaseTimestamp` for it to hold either the sentinel or a concrete `Timestamp` read back from // the server. val timestamp: BaseTimestamp = Timestamp.ServerTimestamp, // or val alternativeTimestamp: FieldValue = FieldValue.serverTimestamp, // or @Serializable(with = DoubleAsTimestampSerializer::class) val doubleTimestamp: Double = DoubleAsTimestampSerializer.SERVER_TIMESTAMP, ) ``` In addition `firebase-firestore` provides [GeoPoint] and [DocumentReference] classes which allow persisting geo points and document references in a native way: ```kotlin @Serializable data class PointOfInterest( val reference: DocumentReference, val location: GeoPoint ) val document = PointOfInterest( reference = Firebase.firestore.collection("foo").document("bar"), location = GeoPoint(51.939, 4.506) ) ```

Polymorphic serialization (sealed classes)

This sdk will handle polymorphic serialization automatically if you have a sealed class and its children marked as `Serializable`. It will include a `type` property that will be used to discriminate which child class is the serialized. You can change this `type` property by using the `@FirebaseClassDiscrminator` annotation in the parent sealed class: ```kotlin @Serializable @FirebaseClassDiscriminator("class") sealed class Parent { @Serializable @SerialName("child") data class Child( val property: Boolean ) : Parent } ``` In combination with a `SerialName` specified for the child class, you have full control over the serialized data. In this case it will be: ```json { "class": "child", "property": true } ```

Serialization of Updates

Firestore contains update methods that allow for multiple fields to be updated at the same time. This sdk offers special update methods that allow for applying custom serialization to each individual field though an update builder. Where an `update` method exists, an `updateFields` method will also be available. In this, each value can have its serializer customized: ```kotlin documentRef.updateFields { // Root level encode settings encodeDefaults = false serializersModule = module "field" to "value" // Set the value of otherField to "1" using a custom Serializer "otherField".to(IntAsStringSerializer(), 1) // Overwrite build settings. All fields added within this block will have these build settings applied withEncodeSettings { encodeDefaults = true serializersModule = otherModule "city" to abstractCity } } ``` Similarly, the `Query` methods `startAt`/`startAfter`/`endAt`/`endBefore` have an alternative method in `startAtFieldValues`/`startAfterFieldValues`/`endAtFieldValues`/`endBeforeFieldValues` ```kotlin query.orderBy("field", "otherField", "city").startAtFieldValues { // similar syntax for startAfter/endAt/endBefore // Root level encode settings encodeDefaults = false serializersModule = module add("Value") // Starts at "1" for the otherField value add(1, IntAsStringSerializer()) // Overwrite build settings. All field values added within this block will have these build settings applied withEncodeSettings { encodeDefaults = true serializersModule = otherModule add(abstractCity) } } ```

Default arguments

To reduce boilerplate, default arguments are used in the places where the Firebase Android SDK employs the builder pattern: ```kotlin UserProfileChangeRequest profileUpdates = new UserProfileChangeRequest.Builder() .setDisplayName("Jane Q. User") .setPhotoUri(Uri.parse("https://example.com/jane-q-user/profile.jpg")) .build() user.updateProfile(profileUpdates) .addOnCompleteListener(new OnCompleteListener() { @Override public void onComplete(@NonNull Task task) { if (task.isSuccessful()) { Log.d(TAG, "User profile updated.") } } }) //...becomes... user.updateProfile(displayName = "Jane Q. User", photoURL = "https://example.com/jane-q-user/profile.jpg") ```

Infix notation

To improve readability and reduce boilerplate for functions such as the Cloud Firestore query operators are built with infix notation: ```kotlin citiesRef.whereEqualTo("state", "CA") citiesRef.whereArrayContains("regions", "west_coast") citiesRef.where(Filter.and( Filter.equalTo("state", "CA"), Filter.or( Filter.equalTo("capital", true), Filter.greaterThanOrEqualTo("population", 1000000) ) )) //...becomes... citiesRef.where { "state" equalTo "CA" } citiesRef.where { "regions" contains "west_coast" } citiesRef.where { all( "state" equalTo "CA", any( "capital" equalTo true, "population" greaterThanOrEqualTo 1000000 ) ) } ```

Operator overloading

In cases where it makes sense, such as Firebase Functions HTTPS Callable, operator overloading is used: ```kotlin val addMessage = functions.getHttpsCallable("addMessage") //In the official android Firebase SDK this would be addMessage.call(...) addMessage(mapOf("text" to text, "push" to true)) ``` ## Contributing If you'd like to contribute to this project then you can fork this repository. You can build and test the project locally. 1. Open the project in IntelliJ IDEA. 2. Install cocoapods via `sudo gem install -n /usr/local/bin cocoapods` 3. Install the GitLive plugin into IntelliJ 4. After a gradle sync then run `publishToMavenLocal` ### Testing To run the tests you can use the following gradle tasks: `./gradlew connectedAndroidTest` (an emulator needs to be running) `./gradlew iosSimulatorArm64Test` (On Apple Chip) `./gradlew iosX64Test` (On Intel Chip) `./gradlew jsNodeTest` `./gradlew jvmTest` For some tests you need to have the firebase emulator suite running. After installing them you can run the following command inside the `test` directory: `firebase emulators:start` ### Documentation For every publicly available class or function there needs to be documentation written in the [KDoc syntax](https://kotlinlang.org/docs/kotlin-doc.html). We publish a new version of the documentation after every release and can be found [here](https://gitliveapp.github.io/firebase-kotlin-sdk/) ### Validation To ensure changes to the public API are well documented, this library validates its binary API. If you make changes to the API, make sure to run `./gradlew apiDump` ### Code style This library uses the [Intellij Kotlin code style](https://www.jetbrains.com/help/idea/code-style-kotlin.html). Run the linter to make sure you follow these styles. `./gradlew formatKotlin` to format to the proper style `./gradlew lintKotlin` to validate the correct style is used ### Compatibility with the official [Firebase Android SDK](https://github.com/firebase/firebase-android-sdk) When this project began, the official Firebase Android SDK was a pure java library and the separate Kotlin extensions (KTX) module consisted of only a few extensions providing some syntactic sugar, for example `Firebase.firestore` instead of `Firebase.getInstance(),` which we naturally copied for the Firebase Kotlin SDK. But with the majority of the Android SDK being designed for Java, the Kotlin SDK was primarily guided by our [Kotlin-first design](https://github.com/GitLiveApp/firebase-kotlin-sdk/?tab=readme-ov-file#kotlin-first-design) principles. More recently, with the official SDK for Android providing better support for Kotlin and the inclusion of the new Kotlin-friendly features direct in the main modules, the API differences between the official SDK and this project are likely to start to blur. Therefore, in particular for developers porting android code to multiplatform, one of our goals going forward will be API compatibility with the Android SDK where possible. For contributors this means following these points when adding new code to the public API of this project: - **Match the [Android SDKs API](https://firebase.google.com/docs/reference/kotlin/packages).** When adding new API coverage use the Android SDK as the guide on what the public API should be in regard to naming, parameters etc. The goal here is *source compatibility*: the `com.google.firebase` layer (see [Using the Firebase Android SDK API from common code](#using-the-firebase-android-sdk-api-from-common-code)) takes the exact Android shape so code consuming the Android SDK compiles *as is*, and the `dev.gitlive` layer keeps the same names with Kotlin-first shapes. Run `./gradlew ::androidSourceCompatDump` to see which Android SDK members a module still lacks. - **Follow our [Kotlin-first design](https://github.com/GitLiveApp/firebase-kotlin-sdk/?tab=readme-ov-file#kotlin-first-design) principles when needed.** If the API you are adding coverage for is new, and it's Kotlin-first in the Android SDK, then you can simply just match the Android SDKs API as described in the first point, but if it's an older Java-first API then ideally we would include an identical API for API compatibility *plus* a Kotlin-first overload. A good example for this is where the Builder pattern is employed in the Android SDK, here we can follow [this Kotlin-first design principle](https://github.com/GitLiveApp/firebase-kotlin-sdk/?tab=readme-ov-file#default-arguments) and provide both methods, one taking the options created with the builder and an overload with default arguments to avoid the builder boilerplate for developers not porting an existing android code base. And finally, please remember that this is an open source project, all the project maintainers are **volunteers**, they are **not paid to maintain** this project, and they have **their own jobs**, so please be **patient** when waiting for a response to your issue or PR. Any form of abuse or harassment will not be tolerated and will result in being reported to GitHub.