how to calculate total value after changing the quantity in custom listview in android

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Mobile

Android

In my application there is an ordering page . I have a quantity and a price column which are totaled at the end.

Initially, after selecting an items the items are stored in the ArrayList. Using for loop, I added all price values in the ArrayList and the total in a variable x. My problem is if I change the value for qty, the price is getting changed correctly but total value is not changed. Ideally, as soon as I change the qty, the total has to be changed dynamically.

public class CustomAdapter extends BaseAdapter {

    public static Double x = 0.0;
    public static Double z;
    ArrayList<integer> selectprice = new ArrayList<integer>();
    public static ArrayList<string> arr1 = new ArrayList<string>();
    public static ArrayList<string> itemprice = new ArrayList<string>();
    public static ArrayList<bitmap> itemimage = new ArrayList<bitmap>();
    ArrayList<integer> total = new ArrayList<integer>();
    public Context Context;
    private LayoutInflater inflater;

    HashMap<string,> map = new HashMap<string,>();


    public CustomAdapter(Context context, ArrayList<string> arr,
        ArrayList<string> price, ArrayList<bitmap> image) {
        Context = context;
        inflater = LayoutInflater.from(context);
        arr1 = arr;
        itemprice = price;

        itemimage = image;
        System.out.println(itemprice);
        System.out.println("arr: " + arr.size());

        for (int i = 0; i < price.size(); i++) {

            x = x + Double.parseDouble(price.get(i));
            //here only I added all prices before changing qty..

        }

    }

    public int getCount() {
        // TODO Auto-generated method stub
        return arr1.size();

    }

    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return arr1.get(position);
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    public View getView(final int position, View convertView, ViewGroup parent) {

        final ViewHolder holder;

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.selecteditemlistview, null);
            holder = new ViewHolder();

            holder.textViewSelectedText = (TextView) convertView.findViewById(R.id.selectedtext);
            holder.price = (TextView) convertView.findViewById(R.id.selectitemprice);
            holder.image = (ImageView) convertView.findViewById(R.id.selectitemimage);
            holder.qty = (EditText) convertView.findViewById(R.id.selectqty);
            holder.total = (TextView) convertView.findViewById(R.id.price);

            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        String amount = holder.qty.getText().toString();
        final Double price1 = Double.parseDouble(itemprice.get(position));
        int qut = Integer.parseInt(holder.qty.getText().toString());
        Double total = (price1 * qut);
        System.out.println(total);
        holder.textViewSelectedText.setText(arr1.get(position));
        holder.price.setText(itemprice.get(position));
        holder.image.setImageBitmap(itemimage.get(position));
        holder.total.setText(String.valueOf(total));

        holder.qty.setOnFocusChangeListener(new OnFocusChangeListener() {

            public void onFocusChange(View v, boolean hasFocus) {
                // TODO Auto-generated method stub
                if (!hasFocus) {

                    int position = v.getId();
                    final EditText Caption = (EditText) v;
                    Caption.setFocusable(true);
                    holder.qty.setFocusable(true);
                    int q = Integer.parseInt(holder.qty.getText().toString());
                    double result = (price1 * q);
                     Double y = x - total;
                z = y + result;
                     x=z;//here only  I added all total before changing..
                    // x=result+q;
                    // System.out.println(x);
                    System.out.println(result);
                    holder.total.setText(String.valueOf(result));
                    // holder.total.setText(""+array[result].toString()+"");

                }

            }
        });

        return convertView;
    }


public class SelectedItem extends Activity  {
    private ListView lv;
    private CustomAdapter adapter;
    int tableid;here only I added all prices before changing
    String id;
    ArrayList<string> arr=new ArrayList<string>();
    ArrayList<string> price=new ArrayList<string>();
    ArrayList<bitmap> image=new ArrayList<bitmap>();
    Double amountvalue;
    TextView totalamount;
    Button order;
    String dtotalamount;

    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        arr=getIntent().getStringArrayListExtra("itemname");
        price=getIntent().getStringArrayListExtra("itemprice");


        image=getIntent().getExtras().getParcelableArrayList("itemimage");

        setContentView(R.layout.selecteditem);
        lv = (ListView) findViewById(R.id.selecteditemlist);
        adapter = new CustomAdapter(this, arr,price,image);
        lv.setAdapter(adapter);
        amountvalue=CustomAdapter.x;

        System.out.println(amountvalue);
        totalamount=(TextView)findViewById(R.id.amount);
        totalamount.setText(String.valueOf(amountvalue));
        order=(Button)findViewById(R.id.order);
        order.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                tableid=Login.tableid;
                id=Integer.toString(tableid);
                System.out.println(id);
                String x=amountvalue.toString();
                System.out.println(x);
            }
        });
    }
}