Listener Example

gistfile1.txt

class HellowWorldRepository {
  interface Listener {
      void onSomethingDone(String result);
  }

  public void doSomething(Listener listener) {
      new Thread(new Runnable(){ // this is the worst way to do threading, google "android threading"
         @Override
         public void run() {
             // do some stuff
             listener.onSomethingDone("Hello World");
         }
      }).start();
  }

}

class OtherClass {

   public void something() {
      HellowWorldRepository repo = new HellowWorldRepository();
      
      repo.doSomething(new Listener() {
          @Override
          public void onSomethingDone(String result) {
              Log.d("TUT", "Success " + result);
          }
      });
   }


}