Android如何将后台通知广播到当前活动？

Question

I'm new to android and I know this question has been asked a lot, but I didn't find a good solution.

I have a singleton SocketIO class which keep receiving information at the background. at the same time I have lots of activities doing different stuff.

now what I what to do is when the SocketIO class received a singal, I need to interrupt the current activity and pop up an alert dialog to show the alert Dialog. And when user click on the "yes" button, it goes to a certain activity to do it's work.

Now I put the socketIO client in a singleton class and write a receiver in each activities to receiver notification from socketIO class. But the problem is I have lots of activities doing different stuff, and the receiver in each activities are actually the same. it's kind of a waste of resources and not efficient. Is there any more efficient way to call current running foreground activity from back end non-activity class?

the Singleton SocketIO class and the receiver in each Activities are like in this link

Answer 1

Use SharedPreferences in your singletons.

This is how you use it

SharedPreferences sharedpreferences;
Editor editor = sharedpreferences.edit();
editor.putString("NAMETOCALL", "valuetostoreforlateruse");
editor.commit();

And this is how you access it for notification

SharedPreferences sharedpreferences = PreferenceManager.getDefaultSharedPreferences(this);
sharedpreferences.getString("NAMETOCALL", null);