Question

I want to run a task that would accept a single string and download that file from the server.
Since network related operations have to be performed on the different thread I have to extend AsyncTask. Referring the online doc I see that it takes three parameters i.e Params, Progress and Result.

I understand that it makes sense to extend a class like this

private class DownloadFileTask extends AsyncTask<URL, Integer, Long>

But right now I just want to download the file and not show any progress or return anything from the function.

extending a class like this gives me error

    private class DownloadFileTask extends AsyncTask<String, void, void>
     {
       protected void doInBackground(Sting url)
       {    //code to simply download file , no progress shown , nothing returned
       }
     }

I also understand as an implementing class DownloadFileTask show override the method

protected abstract Result doInBackground (Params... params)

the Result in its prototype is the third parameter of AsyncTask<…> Template. So I cant have that as void. But isnt there a way to simply download file without showing progress and result?

Answer 1

The generic arguments should be objects, so you should pass Void instead of void.

....extends AsyncTask<String, Void, Void>