DownloadJsonTask

private class DownloadJsonTask extends AsyncTask<String, Void, JSONObject> {
    protected JSONObject doInBackground(String... strings) {
        JSONObject jsonObject = null;

        try {
            InputStream is = new URL(strings[0].toString()).openStream();
            try {
                BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
                jsonObject = new JSONObject(readAll(rd));

            } finally {
                is.close();
            }
        } catch (Exception e) {
            Log.e("DownloadJsonTask", e.getMessage());
        }

        return jsonObject;
    }

    @Override
    protected void onPostExecute(JSONObject result) {
        super.onPostExecute(result);
    }

    private String readAll(Reader rd) throws IOException {
        StringBuilder sb = new StringBuilder();
        int cp;
        while ((cp = rd.read()) != -1) {
            sb.append((char) cp);
        }
        return sb.toString();
    }
}

Cool, works really well. Thanks :-)