[android help] Getting Blank Activity not with existing Product Information while click on List View Item row

I am writing a Cart App, and allowing user to add items into Cart Activity, in cart item list i am using 3 Textviews for numeric value (i.e: Item Cost, Qty, Total) and these values are coming from ProductInformationActivity.java, now i want to allow user to update any of the item which is still in Cart Activity by click on that particular item, i want to open that item in ProductInformationActivity.java with existing details like: what Qty user has entered earlier (like: we see in Cart Apps), to do that i am using below code in my Cart Adapter....

but i guess i am doing something wrong, due to two reasons:

1. I think this is not the exact code to open that particular item with existing details


2. I am getting force close whenever i do click on any of the Item in List View [now this problem has been resolved by @Grishu and @Pragnani]

below is the Line in ProductInformationActivity.java where i am getting NumberFormatException:

itemamount = Double.parseDouble(text_cost_code.getText().toString());

     public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View vi = convertView;
    if (convertView == null)
        vi = inflater.inflate(R.layout.listrow_cart, null);
        vi.setClickable(true);
        vi.setFocusable(true);          

        vi.setOnClickListener(new OnClickListener() {
        @Override

        public void onClick(View v) 
        {   
            HashMap item = Constant.wishProducts.get(position);
            Log.d("CartAdapter", "onClick :: " + item);
            Intent myIntent = new Intent 
            (activity, com.era.restaurant.versionoct.menu.ProductInformationActivity.class);
            Log.d("CartAdapter", "Intent :: " + myIntent);
            myIntent.putExtra("Item", item);
            activity.startActivity(myIntent);        
        }
    });

So here i need your help, tell me what you think what code i should to show selected item in ProductInformationActivity.java with existing details, because i think if i will put correct code in method then i will not get that force close error message...

ProductInformationActivity.java:

 public class ProductInformationActivity extends Activity {

public static final String KEY_TITLE = "title";
public static final String KEY_DESCRIPTION = "description";
public static final String KEY_COST = "cost";
public static final String KEY_TOTAL = "total";
public static final String KEY_QTY = "qty";
public static final String KEY_THUMB_URL = "imageUri";


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.information_product);

    Intent in = getIntent();
    String title = in.getStringExtra(KEY_TITLE);
    String description = in.getStringExtra(KEY_DESCRIPTION);
    String thumb_url = in.getStringExtra(KEY_THUMB_URL);
    String cost = in.getStringExtra(KEY_COST);
    String total = in.getStringExtra(KEY_TOTAL);

    ImageLoader imageLoader = new ImageLoader(getApplicationContext());

    ImageView imgv = (ImageView) findViewById(R.id.single_thumb);
    final TextView txttitle = (TextView) findViewById(R.id.single_title);
    final TextView txtdescription = (TextView) findViewById(R.id.single_description);
    TextView txtheader = (TextView) findViewById(R.id.actionbar);
    text_cost_code = (TextView) findViewById(R.id.single_cost);
    edit_qty_code = (EditText) findViewById(R.id.single_qty);
    edit_qty_code.setText("1");
    txt_total = (TextView) findViewById(R.id.single_total);

    txttitle.setText(title);
    txtheader.setText(title);
    text_cost_code.setText(cost);
    txt_total.setText(total);
    txtdescription.setText(description);
    imageLoader.DisplayImage(thumb_url, imgv);


    if(text_cost_code.getText().length() > 0)
    {
        try
        {
           itemamount = Double.parseDouble(text_cost_code.getText().toString());
           Log.d("ProductInformationActivity", "ItemAmount :: " + itemamount);
        }
        catch(NumberFormatException e)
        {
            itemamount=0.00;
            Log.d("ProductInformationActivity", "NumberFormatException :: " + e);
        }
    }

    txt_total.setText(Double.toString(itemamount));
    edit_qty_code.addTextChangedListener(new TextWatcher() {

        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            // TODO Auto-generated method stub
            if (!edit_qty_code.getText().toString().equals("")
                    || !edit_qty_code.getText().toString().equals("")) {

                // accept quantity by user
                itemquantity = Integer.parseInt(edit_qty_code.getText()
                        .toString());

                // changes in total amount as per change in qty (entered by user)
                txt_total.setText(new DecimalFormat("##.#").format(itemamount*itemquantity));
            } else {
                txt_total.setText("0.00");
            }
        }

        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
            // TODO Auto-generated method stub

        }

        public void afterTextChanged(Editable s) {

        }
    });

    ImageButton mImgAddCart = (ImageButton) findViewById(R.id.button_add);
    mImgAddCart.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            mTitle = txttitle.getText().toString();

            mCost = text_cost_code.getText().toString();
            mCost = mCost.replace("From ", "");
            mTotal = txt_total.getText().toString();
            mTotal = mTotal.replace("From ", "");
            mQty = edit_qty_code.getText().toString();

            if ( Constant.wishProducts.size() <= 0) {
                HashMap mTempObj = new HashMap();
                mTempObj.put(KEY_TITLE, mTitle);
                mTempObj.put(KEY_QTY, mQty);
                mTempObj.put(KEY_COST, mCost);
                mTempObj.put(KEY_TOTAL, mTotal);
                 Constant.wishProducts.add(mTempObj);
            /**
             * code to update, already added item details
             */

            } else {
                for (int i = 0; i <  Constant.wishProducts.size(); i++) {
                    if ( Constant.wishProducts.get(i).get(KEY_TITLE)
                            .equals(mTitle)) {
                         Constant.wishProducts.remove(i);
                        break;
                    } else {
                    }
                }

                HashMap mTempObj = new HashMap();
                mTempObj.put(KEY_TITLE, mTitle);
                mTempObj.put(KEY_QTY, mQty);
                mTempObj.put(KEY_COST, mCost);
                mTempObj.put(KEY_TOTAL, mTotal);
                 Constant.wishProducts.add(mTempObj);
            }

            AlertDialog.Builder alertdialog = new AlertDialog.Builder(
                    ProductInformationActivity.this);
            alertdialog.setTitle(getResources()
                    .getString(R.string.app_name));
            alertdialog.setMessage("Item Added to Order");

            alertdialog.setPositiveButton("OK",
                    new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog,
                                int which) {
                            // TODO Auto-generated method stub
                            finish();
                        }
                    });     
            alertdialog.show();


        }
    });

See some screen shots:

   > Now i want to get this kind of Activity with existing Product Information,
     which i have clicked in List View Item row in Cart Activity

   > Getting this blank Activity, whenever i do click on ListView Item
     row in CartActivity:

   > ListView Item row, which i have clicked in CartActivity.java:

Now i have posted code for ProductInformationActivity.java, and also written that i am passing values from ProductInformationActivity.java to CartActivity.java, and 3 main screen shots to explain you what i want, when i do click on ListView Item row and What i am getting....

Please help me..... :)

.

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