A lightweight publisher/observer open-source library used for messaging to run through the entire Flutter applications. Inspired by NotificationCenter in iOS and EventBus on in Android.
The NotificationCentre in Flutter is inspired by NotificationCenter in iOS and EventBus in Android, since it is used anywhere inside iOS (Swift/Objective-C) codebase, we are very familiar with the model of publisher&observer. Thinking of you, as an Android developer who has knowledge and is such familiar with EventBus.
- Observer: to observe events if there were messages being posted.
- Publisher: to publish the event to all observers.
To add an observer, we suggest that you put the below code inside initState(), but you can still add the observer somewhere.
@override
void initState() {
super.initState();
NotificationCenter().addObserver(NOTIFICATION_NAME_USER_SIGNED_IN, this, () {
// Do something after the user has signed in.
});
}To remove an observer, we suggest that you put the below code inside dispose(), but you can still remove the observer elsewhere.
@override
void dispose() {
NotificationCenter().removeObserver(NOTIFICATION_NAME_USER_SIGNED_IN, this);
super.dispose();
}To post the message throughout the entire application, you can use the below code with ease.
NotificationCenter().postNotification(
NOTIFICATION_NAME_PURCHASE_COMPLETED,
data: {"data": YOUR_DATA, "type": "completed"},
);For the NotificationName, it is just an ordinary String value, it can be any strings.
Just keep in mind, the NotificationName you defined is equal to when you call these three methods: addObserver(), removeObserver(), and postNotification(), pass through the NotificationName you set.