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

0 vote188 views1 answer
Añadir objetos de diferentes clases en una misma lista
Java
3 votes212 views1 answer
How to initialize bigdecimal in java
Java
8 votes202 views1 answer
See openjdk version
Java
0 vote286 views1 answer
Spring boot maven run with profile
Java
2 votes199 views2 answers
Android zoom animation
Java
0 vote200 views2 answers
Java clear string buffer
Java
0 vote220 views2 answers
RecyclerView: No layout manager attached; skipping layout
Java
0 vote228 views1 answer
Javafx arabic letters
Java
0 vote209 views1 answer
Valid parentheses leetcode solution java
Java
2 votes196 views1 answer
Java resize image
Java