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

4 votes100 views1 answer
Java get current milliseconds
Java
-1 vote106 views1 answer
Spring jpa query with union all
Java
0 vote127 views1 answer
In java how to compare two strings
Java
0 vote118 views1 answer
Java regex group not working
Java
0 vote115 views1 answer
Clear a list in java
Java
9 votes105 views4 answers
Jquery set data attribute value
Java
8 votes90 views1 answer
Float to string java
Java
10 votes98 views2 answers
Finding absolute value in java
Java
0 vote102 views1 answer
Replace string placeholder java
Java
0 vote106 views1 answer
Read qr code from image java
Java