设置通知侦听器

介绍如何使用云眼特性标帜(Feature Flag)AB实验Flutter SDK 设置和删除通知侦听器。

通知侦听器会触发您在 SDK 基于某些操作触发时定义的回调函数。

最常见的用例是将所有特性标帜(Feature Flag)决策的流发送到分析提供商或内部数据仓库，以将其与您拥有的有关用户的其他数据联接。

通知侦听器类型

有关通知侦听器类型和用例的更多信息，请参阅通知侦听器。

有关代码示例，请参阅以下部分。

添加或删除所有通知侦听器

下面的示例代码演示如何添加侦听器和删除侦听器。

Dart

// Add Notification Listener (LogEvent) 
var logEventListenerId =   
    await flutterSDK.addLogEventNotificationListener((logEvent) {     
        print(logEvent.url);     
        print(logEvent.params);   
    }); 
// Remove Notification Listener 
await flutterSDK.removeNotificationListener(logEventListenerId);  

// Clear all notification listeners of a certain type 
await flutterSDK.clearNotificationsListeners(ListenerType.logEvent);  

// Clear all notifications 
await flutterSDK.clearAllNotificationListeners();

设置每种类型的通知侦听器

下面的示例代码演示如何设置每种类型的通知侦听器。

Dart

// SET UP DECISION NOTIFICATION LISTENER 
var decisionEventListenerId = await flutterSDK.addDecisionNotificationListener((notification) { 
// Access type on decisionObject to get type of decision 
var decisionType = notification.type;   
    if (decisionType == "flag") {     
        var flagDecisionInfo = notification.decisionInfo;     
        var flagKey = flagDecisionInfo["flagKey"];     
        var enabled = flagDecisionInfo["enabled"];     
        var decisionEventDispatched = flagDecisionInfo["decisionEventDispatched"];   
    }     
        // Send data to analytics provider here 
});  

// SET UP LOG EVENT NOTIFICATION LISTENER 
var logEventListenerId = await flutterSDK.addLogEventNotificationListener((logEvent) {     
    // process the logEvent object here (send to analytics provider, audit/inspect data) 
});  

// SET UP EYEOFCLOUD CONFIG NOTIFICATION LISTENER 
var updateConfigListenerId = await flutterSDK.addConfigUpdateNotificationListener((configNotification) {      
    var eyeofcloudConfig = flutterSDK.getEyeofcloudConfig(); 
});  

// SET UP TRACK LISTENER 
var trackNotificationListenerId = await flutterSDK.addTrackNotificationListener((trackNotification) 
{      
    // process the event here (send to analytics provider, audit/inspect data) 
});