android eclipse qr results

Question

i'm very new to posting questions on this site as well as programming. Forgive me if i miss out on something or a wrong format and such. Putting my hands on android for a project, a restaurant order system. Using android eclipse to do it. I have been successful in making an app that scans QR and displays the results.

When you press scan, it opens the camera and scans a QR and displays the results under "Orders". What i haven't been able to figure out is how can i make it so that everytime i scan, it just adds a new result under the orders? Right now, everytime i scan, it replaces the current result with the new one. I want it to keep adding the results into the order.

This the current coding i have for the Main Activity

public class MainActivity extends Activity {
TextView tvResult;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    tvResult = (TextView) findViewById(R.id.tvResult);

    Button scanBtn = (Button) findViewById(R.id.btnScan);

    add:
    scanBtn.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            try {

                Intent intent = new Intent(
                        "com.google.zxing.client.android.SCAN");
                intent.putExtra("SCAN_MODE", "QR_CODE_MODE,PRODUCT_MODE");
                startActivityForResult(intent, 0);

            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                Toast.makeText(getApplicationContext(), "ERROR:" + e, 1).show();

            }

        }
    });

}
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {

        if (resultCode == RESULT_OK) {
            tvResult.setText(intent.getStringExtra("SCAN_RESULT"));
        } else if (resultCode == RESULT_CANCELED) {
            tvResult.setText("Scan cancelled.");
        }
    }
}

A second question, after displaying the results which after scanning will display "51 Cheese Salami $6.90" for one result as example. The solution to the first question would allow it to be displayed as such

51 Cheese Salami $6.90
52 Charcoal Onion Beef $7.50
53 Salami Panini $6.30

and so on;

I have to send the results to a web service. What would be the best course of action? How would i be able to separate the results into specifics like ID, Name, Price. Parsing it? Adding it into a database first? Is it possible to not involve the use of database? Please correct my question if it doesn't make sense.

Answer 1

I suggest using ListView with custom adapter to display the results of the scan. See example here and here

ActivityMain

public class MainActivity extends Activity {
private Adapter a;
private ArrayList<Car> list;
private TabHost tabhost;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    addListView();
}

private void addListView() {
    list = new ArrayList<Car>();
    // fill list view with Car objects      
    a = new Adapter(list, this);
    final ListView listView = (ListView) findViewById(R.id.list);

    listView.setAdapter(a);
}

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {

        if (resultCode == RESULT_OK) {
            list.add(new Car(/*fill with proper data*/));
            adapter.notifyDataSetChanged(); // to update the listview
        } else if (resultCode == RESULT_CANCELED) {
            // handle somehow 
        }
    }
}

CustomAdapter

private class Adapter extends BaseAdapter { private ArrayList ls; private Context c;

    public Adapter(ArrayList<Car> ls, Context c) {
        this.ls = ls;
        this.c = c;
    }

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

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

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = null;
        Container cont;
        if (convertView == null) {
            v = View.inflate(c, R.layout.component, null);
            cont = new Container();
            cont.txtName = (TextView) v.findViewById(R.id.view_name);
                            cont.txtPrice = (TextView) v.findViewById(R.id.view_price);
            cont.txtId = (ImageView) v.findViewById(R.id.view_id);
            v.setTag(cont);
        } else {
            v = convertView;
            cont = (Container) v.getTag();
        }

        (cont.txtName).setText(ls.get(position).name);
                    (cont.txtPrice).setText(ls.get(position).price);
                    (cont.txtId).setText(ls.get(position).id);

        return v;
    }

}

private class Container {
    TextView txtName, txtPrice, txtId;
}

private class Car {
    String name, price;
            int id;

    public Car(String name, String price, int id) {
        this.name = name;
                    this.price = price;
        this.id = id;
    }
}