Good way to Cancel AsynTask

First Lets have a class like LoginTask

class LoginTask extends AsyncTask<String, Void, String> {

private LoginTask loginTask;

@Override

        protected Void doInBackground(String... unused) {




              if (isCancelled())

                {

                    //retun from here

                    return null; 

                }




// Do your task you want just add this line

}




  @Override

        protected void onPostExecute(String result) {

        }  





}


// Here let say Your main Activity from where you want to cancel your lask

public class LoginActivity extends Activity {

@Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.login);




// Start login task here ok




loginTask = new LoginTask();

            loginTask.execute();

}




//Cancell task here

public void cancelTask(){

//Just check the condition like its Running,Finished or Pending

//import Status as like AsynkTask.Status and cancel the task if it is running than it will call cancel and //you will return to post execute with null value

if (loginTask != null && loginTask.getStatus() != Status.FINISHED)

            loginTask.cancel(true);

}




@Override

onBackPressed(){// Let say you want to cancel task on back press




cancelTask();




}



}