appwrite/docs/examples/1.6.x/client-android/kotlin/databases/update-document.md

import io.appwrite.Client
import io.appwrite.coroutines.CoroutineCallback
import io.appwrite.services.Databases

val client = Client(context)
    .setEndpoint("https://<REGION>.cloud.appwrite.io/v1") // Your API Endpoint
    .setProject("<YOUR_PROJECT_ID>") // Your project ID

val databases = Databases(client)

val result = databases.updateDocument(
    databaseId = "<DATABASE_ID>", 
    collectionId = "<COLLECTION_ID>", 
    documentId = "<DOCUMENT_ID>", 
    data = mapOf( "a" to "b" ), // (optional)
    permissions = listOf("read("any")"), // (optional)
)