Xamarin android Save data from list view to database by webservice

Question

I have button in every item in list view when i try save last item no problem but when i try save another item it save data many times

this is my code

public override View GetView(int position, View convertView, ViewGroup parent)

    {

        var item = trans[position];

        View view = convertView;

        if (view == null) // no view to re-use, create new

            view = context.LayoutInflater.Inflate(Resource.Layout.trans_layout, null);

   view.FindViewById<TextView>(Resource.Id.supply_amount_txt).Text = item.amount1;
        view.FindViewById<TextView>(Resource.Id.demand_amount_txt).Text = item.amount2;
        //view.FindViewById<TextView>(Resource.Id.Text3).Text = item.client_code;
        view.FindViewById<TextView>(Resource.Id.supply_cur_txt).Text = item.cur1;
        view.FindViewById<TextView>(Resource.Id.demadn_cur_txt).Text = item.cur2;
        view.FindViewById<TextView>(Resource.Id.rate_txt).Text = item.rate;
        view.FindViewById<TextView>(Resource.Id.ID_txt).Text = item.tran_id;
        view.FindViewById<TextView>(Resource.Id.user_name_txt).Text = item.username;
        view.FindViewById<TextView>(Resource.Id.tran_date_time_txt).Text = item.tran_date ;
        accept_btn = view.FindViewById<Button>(Resource.Id.btn);        
        amo2 = Convert.ToDecimal(item.amount2);
        cu2 = item.cur2;
        amo1 = Convert.ToDecimal(item.amount1);
        cu1 = item.cur1;
        rat = Convert.ToDecimal(item.rate);
        tr_id = Convert.ToInt32(item.tran_id);
        cl_code = item.client_code;
           accept_btn.Click +=delegate {
               myWS.ChekTranIDAsync(Convert.ToInt32(item.tran_id));
               XTran = Convert.ToInt32(Convert.ToInt32(item.tran_id));
               myWS.ChekTranIDCompleted += MyWS_ChekTranIDCompleted;

           };
 


        return view;
      
    }


private void MyWS_ChekTranIDCompleted(object sender, myWS.ChekTranIDCompletedEventArgs e)
    {
        //myWS.accept_tranAsync("123", Convert.ToDecimal(item.amount2), item.cur2, Convert.ToDecimal(item.amount1), item.cur1, Convert.ToDecimal(item.rate), "ابو ليلى", Convert.ToInt32(item.tran_id), item.client_code);
        myWS.accept_tranAsync("123", amo2, cu2, amo1, cu2, rat, "xxx", XTran, cl_code);
        myWS.accept_tranCompleted += MyWS_accept_tranCompleted;


    }

We can not make sure there is absolutely no guarantee on the order in which getView() will be called nor how many times. It would be better to reuse the the old view. — Wendy Zang - MSFT, Sep 22 '20 at 08:42
@WendyZang-MSFT thanks for your help.... you said "It would be better to reuse the the old view" how I can do it?! — AHMED AHMED, Sep 27 '20 at 17:07
The old view is the convertView which reused. You could refer to the link below. https://stackoverflow.com/a/2873471 — Wendy Zang - MSFT, Sep 29 '20 at 07:12

score 0 · Answer 1 · answered Sep 17 '20 at 21:17

0

accept_btn.Click +=delegate

This code is executed multiple times as items are recycled for visual display and GetView gets run multiple times for the same view holder. So you need to unsubscribe first.

answered Sep 17 '20 at 21:17

Ivan Ičin

9,672
5
36
57

Can you Explain more please?! – AHMED AHMED Sep 18 '20 at 04:03

Xamarin android Save data from list view to database by webservice

1 Answers1