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Kotlin

    March 23, 2025
    + 12

    Description — Couchbase Lite for Android — Kotlin support
    Related Content — Databases | Documents | Indexing |

    Introduction

    Couchbase Lite Android 3.2.2 introduces full idiomatic support for Kotlin apps, out-of-the-box.

    Kotlin developers can now build apps using common Kotlin Patterns, that integrate seamlessly with Couchbase Lite for Android and have full feature parity with the Java API; including some convenient Kotlin Extensions to get you started.

    Key features include:

    • Nullability annotations

    • Named parameters

    • Kotlin Flows, for asynchronous event notifications

    Java support and functionality continues for Android.

    Kotlin Extensions

    In addition to having full co-compatible access to the existing Java API, Kotlin developers can also access a number of Kotlin Extensions.

    The Kotlin Extensions package includes:

    • Configuration Factories for the configuration of important Couchbase Lite objects such as Databases, Replicators and Listeners.

    • Change Flows that monitor key Couchbase Lite objects fpr change using Kotlin features such as, Co-routines and Flows.

    See: Kotlin Extensions for extension API docs

    Configuration Factories

    Couchbase Lite provides a set of ConfigurationFactories and CommonConfigurationFactories, these allow use of named parameters to specify property settings.

    This makes it simple to create variant configurations, by simply overriding named parameters:

    Example of overriding configuration
    kotlin
    ViewCopy
    val listener8080 = URLEndpointListenerConfigurationFactory.newConfig(
    networkInterface = "en0",
    port = 8080
)
val listener8081 = listener8080.newConfig(port = 8081)

    Database

    Use DatabaseConfigurationFactory to create a DatabaseConfiguration object, overriding the receiver’s values with the passed parameters.

    kotlin
    Copy
    database = Database("getting-started")

    Replication

    Use ReplicatorConfigurationFactory to create a ReplicatorConfiguration object, overriding the receiver’s values with the passed parameters.

    kotlin
    Copy
    val replicator =
    Replicator(
        ReplicatorConfigurationFactory.newConfig(
            collections = mapOf(db.collections to null),
            target = URLEndpoint(URI("ws://localhost:4984/getting-started-db")),
            type = ReplicatorType.PUSH_AND_PULL,
            authenticator = BasicAuthenticator("sync-gateway", "password".toCharArray())
        )
    )

    Full Text Search

    Use FullTextIndexConfigurationFactory to create a FullTextIndexConfiguration object, overriding the receiver’s values with the passed parameters.

    kotlin
    ViewCopy
    collection.createIndex(
    "overviewFTSIndex",
    FullTextIndexConfigurationFactory.newConfig("overview")
)

    Indexing

    Use ValueIndexConfigurationFactory to create a ValueIndexConfiguration object, overriding the receiver’s values with the passed parameters.

    kotlin
    ViewCopy
    collection.createIndex(
    "TypeNameIndex",
    ValueIndexConfigurationFactory.newConfig("type", "name")
)

    Logs

    Use LogFileConfigurationFactory to create a LogFileConfiguration object, overriding the receiver’s values with the passed parameters.

    kotlin
    Copy
    Database.log.file.let {
    it.config = LogFileConfigurationFactory.newConfig(
        context.cacheDir.absolutePath, (1)
        maxSize = 10240, (2)
        maxRotateCount = 5, (3)
        usePlainText = false
    ) (4)
    it.level = LogLevel.INFO (5)

}

    Flows

    These wrappers use Flowables to monitor for changes.

    Database Change Flow

    Use the databaseChangeFlow(Database,Executor) to monitor database change events.

    kotlin
    Copy
    val updatedDocs = db.databaseChangeFlow()
    .map { it.documentIDs }
    .asLiveData()

    Document Change Flow

    Use documentChangeFlow(Database,String,Executor) to monitor changes to a document.

    kotlin
    Copy
    val docModDate = db.documentChangeFlow("1001", null)
    .map { it.collection.getDocument(it.documentID)?.getString("lastModified") }
    .asLiveData()

    Replicator Change Flow

    Use replicatorChangeFlow(Replicator,Executor) to monitor replicator changes.

    kotlin
    Copy
    val replState = repl.replicatorChangesFlow()
    .map { it.status.activityLevel }
    .asLiveData()

    Document Replicator Change Flow

    Use documentReplicationFlow(Replicator,Executor) to monitor document changes during replication.

    kotlin
    Copy
    val replicatedDocs = repl.documentReplicationFlow(testSerialExecutor)
    .map { update -> update.documents }
    .onEach { listView.setUpdated(it) }
    .collect()

    Query Change Flow

    Use queryChangeFlow(Query,Executor) to monitor document changes during replication.

    kotlin
    Copy
    fun watchQuery(query: Query): LiveData<List<Result>> {
    return query.queryChangeFlow()
        .mapNotNull { change ->
            val err = change.error
            if (err != null) {
                throw err
            }
            change.results?.allResults()
        }
        .asLiveData()
}

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