Java: Illegal type 'void' in ASyncTask

Question

Hopefully you can shine some light on this for me.

I'm trying to create the following AsyncTask in Java for an Android app. When I enter the below code, Android Studio highlights both the 'void' params with the error:

"Illegal Type: Void".

After a number of google searches I still can't understand what the problem is here (and in honesty, I'm quite confused about the whole thing!).

private class BackgroundTask extends AsyncTask<URL, void, void> {

    protected void doInBackground(URL... inputURL) {

        URL searchURL = inputURL[0];

        //Step 2: Get Data
        String JSONdata = getJSONdata(searchURL);

        //Step 3: Parse JSON
        ArrayList books = parseJSON(JSONdata);

        updateUI(books);

    }
}

Appreciate any info you can send my way!

Answer 1

use the class instead, capital V

private class BackgroundTask extends AsyncTask<URL, Void, Void> {

Answer 2

AsyncTask uses generics. So use Void instead of void. Similarly, if you want to use integer use Integer and not int.