Android on change class event

//It's not possible directly. However, you can make your field private, add getters and setters, and create a method of adding listeners (this is called the Observer pattern):

interface ConnectionBooleanChangedListener {
    public void OnMyBooleanChanged();
}

public class Connect { 
     private static boolean myBoolean;
     private static List<ConnectionBooleanChangedListener> listeners = new ArrayList<ConnectionBooleanChangedListener>();

     public static boolean getMyBoolean() { return myBoolean; }

     public static void setMyBoolean(boolean value) {
         myBoolean = value;

         for (ConnectionBooleanChangedListener l : listeners) {
             l.OnMyBooleanChanged();
         }
     }

     public static void addMyBooleanListener(ConnectionBooleanChangedListener l) {
         listeners.add(l);
     }
}

//Then, wherever you want to listen to changes of the boolean, you can register a listener:

Connect.addMyBooleanListener(new ConnectionBooleanChangedListener() {
    @Override
    public void OnMyBooleanChanged() {
        // do something
    }
});

//Adding a method to remove listeners is left as an exercise. Obviously, for this to work, you need to make sure that myBoolean is only changed via setMyBoolean, even inside of Connect.

Source: stackoverflow.com

Similar codes

2 votes137 views1 answer
Como crear un array en java
Java
0 vote127 views1 answer
Java escribir ventana grafica
Java
-1 vote142 views1 answer
Java printstacktrace
Java
3 votes136 views1 answer
Spring bean xml configuration
Java
1 vote135 views1 answer
Java calculate delta time from thread
Java
1 vote151 views1 answer
Spring boot mongodb update subdocument
Java
0 vote140 views2 answers
How to create a console in java gui
Java
1 vote128 views1 answer
Filter arraylist java
Java
0 vote124 views1 answer
Number of matches regex java
Java
0 vote141 views1 answer
GetMapping("/rest/v1/books") in spring rest api
Java