Flutter SDK Getting Started

Initializing the SDK

We recommend initializing the SDK once and pass around the client instance around in your app. Using the builder pattern we can initialize the DevCycle SDK by providing the DevCycleUser and DevCycle mobile SDK key:

import 'package:devcycle_flutter_client_sdk/devcycle_flutter_client_sdk.dart';

void main() {
    runApp(const MyApp());
}

class MyApp extends StatefulWidget {
    const MyApp({super.key});

    @override
    State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
    static final user = DevCycleUserBuilder().isAnonymous(true).build();
    static final options = DevCycleOptionsBuilder().logLevel(LogLevel.error).build();

    final _devcycleClient = DevCycleClientBuilder()
        .sdkKey('<DEVCYCLE_MOBILE_SDK_KEY>')
        .user(user)
        .options(options)
        .build();

    @override
    void initState() {
        super.initState();
    }

    ...
}

The user object may specify a userId for a given User. If the userId is not specified, the User is considered to be anonymous.

DevCycleClient Builder

The DevCycleClient can be built using the following methods:

DevCycleClientBuilder class

Method	Parameter	Description
sdkKey	String	DevCycle SDK Key
user	DevCycleUser	DevCycleUser object
options	DevCycleOptions	DevCycleOptions object

DevCycleUser Builder

The DevCycleUser can be built using the following methods:

DevCycleUserBuilder class

Method	Parameter	Description
userId	String	Unique user ID
isAnonymous	Bool	Boolean to indicate if the user is anonymous
email	String	User's email
name	String	User's name
language	String	User's language
country	String	User's country
customData	[String: Any]	Key/value map of properties to be used for targeting
privateCustomData	[String: Any]	Key/value map of properties to be used for targeting. Private properties will not be included in event logging.

DevCycleOptions Builder

The SDK exposes various initialization options which can be used by passing a DevCycleOptions object to the options method of DevCycleClient.builder():

DevCycleOptionsBuilder class

Method	Parameter	Default	Description
flushEventsIntervalMs	Int	10000	Controls the interval between flushing events to the DevCycle servers in milliseconds, defaults to 10 seconds.
disableCustomEventLogging	Boolean	false	Disables logging of custom events generated by calling .track() method to DevCycle.
disableAutomaticEventLogging	Boolean	false	Disables logging of SDK generated events (e.g. variableEvaluated, variableDefaulted) to DevCycle.
logLevel	LogLevel	error	Set log level of the default logger. Defaults to error
enableEdgeDB	Boolean	false	Enables the usage of EdgeDB for DevCycle that syncs User Data to DevCycle.
configCacheTTL	Int	604800000	The maximum allowed age of a cached config in milliseconds, defaults to 7 days
disableConfigCache	Bool	false	Disable the use of cached configs
disableRealtimeUpdates	Bool	false	Disable Realtime Updates

Notifying when DevCycle features are available

In the initialize call there is an optional onInitialized parameter you can use to determine when your features have been loaded:

final _devcycleClient = DevCycleClientBuilder()
    .sdkKey('<DEVCYCLE_MOBILE_SDK_KEY>')
    .user(DevCycleUserBuilder().build())
    .build()
    .onInitialized((error) {
        print(error)
    });