Checking the Subscription Status of a Topic

You might want to check if the current user is already subscribed to a topic. For example, your application may want to show a "SUBSCRIBE" button for users who have not yet subscribed to a topic and an "UNSUBSCRIBE" button instead for those users who are already subscribed to the topic.

Here is the sample code for checking the subscription status.

try {
  // Instantiate the target topic.
  String topicName = "SendingAlert";
  KiiTopic topic = Kii.topic(topicName);

  // Check if the current user is subscribed to the topic.
  KiiUser user = KiiUser.getCurrentUser();
  KiiPushSubscription sub = user.pushSubscription();
  boolean isSubscribed = sub.isSubscribed(topic);

  if (isSubscribed) {
    // The current user is subscribed to the topic.
  } else {
    // The current user is not subscribed to the topic.
  }
} catch (IOException ioe) {
  // Handle the error.
} catch (AppException e) {
  // Handle the error.
}

// Instantiate the target topic.
String topicName = "SendingAlert";
KiiTopic topic = Kii.topic(topicName);

// Check if the current user is subscribed to the topic.
KiiUser user = KiiUser.getCurrentUser();
KiiPushSubscription sub = user.pushSubscription();
sub.isSubscribed(topic, new KiiPushCallBack() {
  @Override
  public void onCheckSubscriptionCompleted(int taskId, KiiSubscribable target, boolean isSubscribed, Exception exception) {
    if (exception != null) {
      // Handle the error.
      return;
    }

    if (isSubscribed) {
      // The current user is subscribed to the topic.
    } else {
      // The current user is not subscribed to the topic.
    }
  }
});

Here's a description of the sample code:

Instantiates a topic.
Creates a KiiPushSubscription instance by calling the pushSubscription method.
Calls the isSubscribed method to check if the current user is already subscribed to the topic.