userId

The anonymous user ID is automatically generated and persisted to disk, so it remains consistent across app launches until the user is identified.

Purpose

Returns the current user's unique identifier, either from a previous call to identify() or an anonymous ID if not identified.

Signature

// Accessed via Superwall.instance
val userId: String

// Java
public String getUserId()

Parameters

This is a read-only property on the Superwall.instance with no parameters.

Returns / State

Returns a String representing the user's ID. If identify() has been called, returns that user ID. Otherwise, returns an automatically generated anonymous user ID that is cached to disk.

Usage

Get the current user ID:

val currentUserId = Superwall.instance.userId
println("User ID: $currentUserId")

Check if user is identified:

if (Superwall.instance.isLoggedIn) {
    println("User is identified with ID: ${Superwall.instance.userId}")
} else {
    println("User is anonymous with ID: ${Superwall.instance.userId}")
}

Example usage in analytics:

fun trackAnalyticsEvent() {
    val userId = Superwall.instance.userId
    Analytics.track("feature_used", mapOf(
        "user_id" to userId,
        "timestamp" to System.currentTimeMillis()
    ))
}

Example usage in custom logging:

fun logError(error: Throwable) {
    Logger.log("Error for user ${Superwall.instance.userId}: ${error.message}")
}

Java usage:

// Get current user ID
String currentUserId = Superwall.getInstance().getUserId();
System.out.println("User ID: " + currentUserId);

// Check if user is identified
if (Superwall.getInstance().isLoggedIn()) {
    System.out.println("User is identified with ID: " + 
                      Superwall.getInstance().getUserId());
} else {
    System.out.println("User is anonymous with ID: " + 
                      Superwall.getInstance().getUserId());
}