How to pass values from a Class to Activity - Android

Question

I have a newbie question about Class/Task/Activity. I\'m coming from C so I don\'t know if it\'s a good approach to do what I need.

I\'ve created a class:

Answer 1

You can use Callback for this purpose.

Define some interface like

public interface MyCustomInterface(){
    public void sendData(String str);
}

Now let your Activity implement this interface.

public class MyActivity implements MyCustomInterface {

@Override
public void sendData(String str){

Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
  @Override
  public void run() {
    recived_message.setText(str);
  }
});
}
}

Now in UDPServer.java, write the following code

public class UDPServer {

private MyCustomInterface interface;

UDPServer(MyCustomInterface interface){
 this.interface = interface; 
}

}

Now whenever you have some data available lets say a string, you can send it like this

interface.sendData(str);