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Point your Firebase Android SDK at Lark by passing your Lark URL to FirebaseDatabase.getInstance(). Everything else (listeners, writes, queries) works without changes.

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Setup

Add the Realtime Database dependency to your module’s build.gradle: 
dependencies {
    implementation 'com.google.firebase:firebase-database'
}

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Connect to Lark

Pass your Lark URL when getting the database instance: 
import com.google.firebase.database.FirebaseDatabase

// Change this from https://PROJECT_ID.firebaseio.com
val database = FirebaseDatabase.getInstance("https://your-lark-project-id.larkdb.net")
val myRef = database.getReference("players/alice")
If your google-services.json already has the databaseURL field, you can update it there instead and use FirebaseDatabase.getInstance() without arguments.

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Database routing

If your Firebase app stores many independent data silos under path prefixes (game rooms, workspaces, etc.), see Database routing for options on splitting them into separate Lark databases.