Equivalent of iOS NSNotificationCenter in Android?

Question

Is there an equivalent of the iOS class NSNotificationCenter in Android ? Are there any libraries or useful code available to me ?

Answer 1

i had the same wondrings.. so i wrote this:

public class NotificationCenter {

    //static reference for singleton
    private static NotificationCenter _instance;

    private HashMap> registredObjects;

    //default c'tor for singleton
    private NotificationCenter(){
        registredObjects = new HashMap>();
    }

    //returning the reference
    public static synchronized NotificationCenter defaultCenter(){
        if(_instance == null)
            _instance = new NotificationCenter();
        return _instance;
    }

    public synchronized void addFucntionForNotification(String notificationName, Runnable r){
        ArrayList list = registredObjects.get(notificationName);
        if(list == null) {
            list = new ArrayList();
            registredObjects.put(notificationName, list);
        }
        list.add(r);
    }

    public synchronized void removeFucntionForNotification(String notificationName, Runnable r){
        ArrayList list = registredObjects.get(notificationName);
        if(list != null) {
            list.remove(r);
        }
    }

    public synchronized void postNotification(String notificationName){
        ArrayList list = registredObjects.get(notificationName);
        if(list != null) {
            for(Runnable r: list)
                r.run();
        }
    }

}

and a usage for this will be:

  NotificationCenter.defaultCenter().addFucntionForNotification("buttonClick", new Runnable() {
        @Override
        public void run() {
            Toast.makeText(MainActivity.this, "Hello There", Toast.LENGTH_LONG).show();
        }
    });

tried to make the interface as similar to IOS as possible, but simpler (no object registration needed).

hope that helps:)