spinner selected value returns to old value when recyclerview row is clicked - android-recyclerview

Question

i have created an android application using xamarin.android. the application has a recyclerview that contains a spinner. what i want is when the user selects an item from the spinner, i need to change the value of the corresponding column and row in the datatable and i need the new value to be displayed in the spinner in the recyclerview in the row where the spinner value is selected. the problem is that whenever a value is selected, when another row is clicked, the old value of the spinner is displayed. i tried a lot of ways like the code in the following link: https://www.codeproject.com/articles/1033283/android-recycler-view-with-spinner-item-change-sel, but it didn't work. this is my code:
public class recyclerview_viewholder : RecyclerView.ViewHolder
{
public TextView rownbr, laborname;
public EditText overtime;
public LinearLayout linearLayout;
public Spinner days;
public recyclerview_viewholder(View itemView, Action<int> listener)
: base(itemView)
{
rownbr = itemView.FindViewById<TextView>(Resource.Id.rownbr);
laborname = itemView.FindViewById<TextView>(Resource.Id.laborname);
days = itemView.FindViewById<Spinner>(Resource.Id.days);
overtime = itemView.FindViewById<EditText>(Resource.Id.overtime);
linearLayout = itemView.FindViewById<LinearLayout>(Resource.Id.linearLayout);
itemView.Click += (sender, e) => listener(base.LayoutPosition);
}
public class recyclerviewAdapter : RecyclerView.Adapter
{
// Event handler for item clicks:
public event EventHandler<int> ItemClick;
// public event EventHandler<AdapterView.ItemSelectedEventArgs> SpinnerItemSelectionChanged;
public static DataTable summary_Requests = new DataTable();
//Context context;
public readonly new_schedule context;
public static int selected_pos = -1;
RecyclerView recyclerView;
FloatingActionButton delete;
public recyclerviewAdapter(new_schedule context, DataTable sum_req, RecyclerView recyclerView)
{
this.context = context;
summary_Requests = sum_req;
this.recyclerView = recyclerView;
}
public override RecyclerView.ViewHolder
OnCreateViewHolder(ViewGroup parent, int viewType)
{
View itemView = LayoutInflater.From(parent.Context).
Inflate(Resource.Layout.recycler_view_new_schedule_data, parent, false);
recyclerview_viewholder vh = new recyclerview_viewholder(itemView, OnClick);
vh.days.ItemSelected += (sender, e) =>
{
Spinner spinner = (Spinner)sender;
int position = Convert.ToInt32(spinner.Tag);
summary_Requests.Rows[position]["dayNbr"] = Convert.ToDecimal(spinner.GetItemAtPosition(e.Position).ToString());
};
vh.overtime.TextChanged += (sender, e) =>
{
if (vh.overtime.Text != "")
try
{
int position = vh.LayoutPosition;
summary_Requests.Rows[position]["overtimeHours"] = Convert.ToInt32(vh.overtime.Text);
user.zero_val = "Not_exist";
}
catch (System.FormatException exp)
{
var icon = AppCompatResources.GetDrawable(context.Context, Resource.Drawable.error_ic);
icon.SetBounds(0, 0, 50, 50);
vh.overtime.SetError("unit must be integer not decimal", icon);
user.zero_val = "exits";
}
else if (vh.overtime.Text == "")
{
var icon = AppCompatResources.GetDrawable(context.Context, Resource.Drawable.error_ic);
icon.SetBounds(0, 0, 50, 50);
vh.overtime.SetError("value can not be empty", icon);
user.zero_val = "exits";
}
};
return vh;
}
public override void
OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
recyclerview_viewholder vh = holder as recyclerview_viewholder;
vh.rownbr.Text = summary_Requests.Rows[position]["rowNumber"].ToString();
vh.laborname.Text = summary_Requests.Rows[position]["laborerName"].ToString();
List<decimal> days_data = new List<decimal>();
days_data.Add((decimal)0.5);
days_data.Add((decimal)1);
var adapter = new ArrayAdapter(this.context.Context, Android.Resource.Layout.SimpleSpinnerItem, days_data);
adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
vh.days.Tag = position;
vh.days.Adapter = adapter;
vh.days.SetSelection(1);
vh.overtime.Text = summary_Requests.Rows[position]["overtimeHours"].ToString();
if (selected_pos == position)
vh.ItemView.SetBackgroundColor(Color.ParseColor("#4fa5d5"));
else
vh.ItemView.SetBackgroundColor(Color.LightGray);
vh.ItemView.Click += (sender, e) =>
{
int pos = vh.LayoutPosition;
user.del_pos = position;
selected_pos = position;
NotifyDataSetChanged();
//fill global variables that need to be passed to detail fragment
};
//delete.Click += delegate
//{
// vh.days.Enabled = false;
//};
}
public DataTable get_dt_final()
{
DataTable final_dt = summary_Requests.Copy();
return final_dt;
}
public override long GetItemId(int position)
{
return position;
}
public void deleteItem(int index)
{
summary_Requests.Rows.RemoveAt(index);
NotifyItemRemoved(index);
}
public override int ItemCount
{
get { return summary_Requests.Rows.Count; }
}
// Raise an event when the item-click takes place:
void OnClick(int position)
{
if (ItemClick != null)
ItemClick(this, position);
// user.req_pos = position;
}
}
}
}

Answer 1

I read the article that you provide, you need to do two things when you change spinner value, firstly, you need to change vegeList's itemPosition quantity by SpinnerItemSelectionChangedEvent, then you need to update TotalAmount in OnBindViewHolder
private void SpinnerItemSelectionChangedEvent(object sender, AdapterView.ItemSelectedEventArgs e)
{
Spinner spinner = (Spinner)sender;
var itemPosition = Convert.ToInt32(spinner.Tag);
//Update the view by Total Amount, after spinner value is been selected.
var currentquantity = vegeList[itemPosition].Quantity;
var selectedQuantity = Convert.ToInt32(spinner.GetItemAtPosition(e.Position).ToString());
if (currentquantity != selectedQuantity)
{
vegeList[itemPosition].Quantity = selectedQuantity;
Madapter.NotifyItemChanged(itemPosition);
}
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
var item = Items[position];
var vh = holder as VegeViewHolder;
var spinnerPos = 0;
var adapter = new ArrayAdapter<String>(Context, Android.Resource.Layout.SimpleSpinnerItem, _quantity);
adapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
vh.Name.Text = item.Name;
vh.Price.Text = string.Format("Price: ${0}", item.Price);
vh.ItemView.Tag = position;
if (item.Quantity > 0)
{
spinnerPos = adapter.GetPosition(item.Quantity.ToString());
vh.TotalAmount.Text = string.Format("${0}", item.Price * item.Quantity);
}
else
{
vh.TotalAmount.Text = "";
}
vh.Quantity.Tag = position; //keep reference to list view row position
vh.Quantity.Adapter = adapter;
vh.Quantity.SetSelection(spinnerPos);
vh.Image.SetImageResource(item.ImageId);
}