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 vote223 views1 answer
Start with <> and end with <> in Java
Java
1 vote204 views3 answers
Java zahlen runden auf 1 nachkommastelle
Java
-2 votes244 views1 answer
Style jbuttons
Java
1 vote240 views1 answer
Spigot respawn player location
Java
1 vote239 views1 answer
Events that people think are unlikely but actually have high probability
Java
6 votes237 views6 answers
Foreach map java
Java
2 votes239 views3 answers
Add comment in java
Java
8 votes240 views1 answer
Java test if a string is a int
Java
0 vote230 views1 answer
Add SOSL to apex Example
Java
-2 votes244 views1 answer
How to add a number to the ascii value of a char in java
Java