AsyncTask.java

AsyncTask<ResultType> task = new AsyncTask<>();

task
  .setTask(new Task() { 
    void run() { 
      doSomething(); 
    } 
  })
  .setResultListener(new ResultListener<ResultType>() { 
    void onResult(ResultType v) {
      processResult(v);
    }
  })
  .setErrorListener(new ErrorListener<Exception>() {
   void onException(Exception e) {
     processException(e);
   } 
  });
  
task.start();