How to made sql query to group by name and grade

I'm creating android app with lots of data user enters.

Now I need to display some data just like on the image below

I made first part of image, where all data is listed. Now I need to made some recapitulation where data is grouped by sort. If there are items with the same grade it needs to place them under the same row and count how many pieces of them are and also sum their masses and prices.

This is part of code where I'm displaying itemsList:

public class LogsRecapitulation extends AppCompatActivity {

    private ListView mainListView;
    private BaseAdapter listAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_listview);
        mainListView = (ListView) findViewById(R.id.ListViewItem);

        //recieve RecepitID in displayLogs.activity
        final long forwardedId = (long) getIntent().getExtras().get(String.valueOf("recepitID"));
        List<Logs> logsList = new Select().from(Logs.class).where("Receipt = " + forwardedId).execute();


        listAdapter = new RecapitulationArrayAdapter(logsList);
        mainListView.setAdapter(listAdapter);
    }

    private class RecapitulationArrayAdapter extends BaseAdapter {
        private LayoutInflater inflater;
        private List<Logs> logsList;

        public RecapitulationArrayAdapter(List<Logs> logsList) {
            inflater = LayoutInflater.from(LogsRecapitulation.this);
            this.logsList = logsList;
        }

        @Override
        public int getCount() {
            return logsList.size();
        }

        @Override
        public Object getItem(int position) {
            return logsList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return logsList.get(position).getId();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                convertView = inflater.inflate(R.layout.logs_recapitulation, parent, false);
            }
            Logs log = logsList.get(position);
            ((TextView) convertView.findViewById(R.id.rec_log_sort)).setText(log.sort_id);
            ((TextView) convertView.findViewById(R.id.rec_log_class)).setText(log.grade);
            ((TextView) convertView.findViewById(R.id.rec_log_count)).setText(String.valueOf(logsList.size()));
            ((TextView) convertView.findViewById(R.id.rec_logs_mass)).setText(String.format("%.2f m3", log.getM3()));

            if (log.receipt.priceType.equals("Na panju")) {
                ((TextView) convertView.findViewById(R.id.rec_log_price_default)).setText(String.valueOf(log.price.stumpPrice_kn));
            } else {
                ((TextView) convertView.findViewById(R.id.rec_log_price_default)).setText(String.valueOf(log.price.roadPrice_kn));
            }

            if (log.receipt.priceType.equals("Na panju")) {
                ((TextView) convertView.findViewById(R.id.rec_calculated_price)).setText(String.format("%.2f KN", log.price.stumpPrice_kn * log.getM3()));
            } else {
                ((TextView) convertView.findViewById(R.id.rec_calculated_price)).setText(String.format("%.2f KN", log.price.roadPrice_kn * log.getM3()));
            }

            return convertView;
        }
    }

This upper code is not so important, but more important to me is to made this recapitulation and group items by sort and in each sort by grade.

Question: How should I group items by sort and in each sort group them by grade (just like on image up)? Any help is welcome!