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android - 添加新列表后，删除 Spinner Adapter 中的选定值（选中的单选按钮）

问题描述

我的微调器中有一个过滤器复选框，用于过滤任务完成与否的位置。如果我选中一个项目并选中过滤器复选框，即使列表已经是新的，微调器中的选定值（选中单选按钮）仍会被选中。

代码片段 我的微调器中有一个过滤器复选框，用于过滤任务完成与否的位置。如果我选中一个项目并选中过滤器复选框，即使列表已经是新的，微调器中的选定值（选中单选按钮）仍会被选中。


    public class CustomSpinnerAdapter : ArrayAdapter<String> {

        String type = String.Empty;
        List<string> orderList = new List<string>();


        /// <summary>
        /// CUstom Spinner Array Adapter constructor
        /// </summary>
        /// <returns></returns>
        public CustomSpinnerAdapter(Context context, int textViewResourceId, List<String> objects, String type)
                : base(context, textViewResourceId, objects) {
            this.type = type;
            this.orderList = objects;
        }

        /// <summary>
        /// returns the total array count minus one
        /// </summary>
        /// <returns>int</returns>
        public override int Count
        {
            get
            {
                return base.Count;
            }
        }

        public override View GetDropDownView(int position, View convertView, ViewGroup parent)
        {
            return getCustomView(position, convertView, parent);
        }

        public View getCustomView(int position, View convertView, ViewGroup parent)
        {
            LayoutInflater inflater = (LayoutInflater)Context.GetSystemService(Context.LayoutInflaterService);
            View view = null;

            if (position == 0)
            {
                if(Constants.ORDER_LIST == type) {

                    view = inflater.Inflate(Resource.Layout.CustomSpinnerView, null, true);
                    Switch filterOrder = (Switch) view.FindViewById(Resource.Id.switch_filterOrder);
                    filterOrder.Checked = Constants.ORDER_SWITCH_CLOSED == Constants.ORDER_SWITCH;

                    filterOrder.CheckedChange += delegate (object sender, CompoundButton.CheckedChangeEventArgs e)
                    {
                        saveOrderChecked(e.IsChecked);

                        PageTaskSearchView pageTaskSearchView = new PageTaskSearchView();

                        orderList = pageTaskSearchView.retrieveOrderlist(Constants.ORDER_SWITCH);


                        base.Clear();
                        base.AddAll(orderList);
                        base.NotifyDataSetChanged();

                    };

                }

                else
                {
                    LinearLayout.LayoutParams layoutparams = new LinearLayout.LayoutParams(0, 0);
                    view = base.GetDropDownView(position, convertView, parent);
                    TextView tv = (TextView)view;
                    tv.SetHeight(0);
                    tv.LayoutParameters = layoutparams;
                    tv.Visibility = ViewStates.Gone;
                    view = tv;
                }
            }
            else
            {
                view = base.GetDropDownView(position, null, parent);
            }

            parent.VerticalScrollBarEnabled = false;
            return view;

        }

        public static void saveOrderChecked(bool saveChecked)
        {
            Constants.ORDER_SWITCH = saveChecked ? Constants.ORDER_SWITCH_CLOSED : 0;
            Constants.ORDER_SWITCH_TRIGGER = true;
        }
    }
}

        orderSpinner = (Spinner)view.FindViewById(Resource.Id.spinner_workOrder);
        orderListResult = new List<string>();
        clearOrderIDListSelection();
        orderListResult.Clear();
        orderListResult.Add(Constants.EMPTY_STRING);
        foreach (OrderModel orderData in orderIds)
        {
            orderListResult.Add(orderData.IDNo);
        }

        OrderIdAdapter = new CustomSpinnerAdapter(context, Resource.Layout.ListItem, orderListResult, Constants.ORDER_LIST);
        OrderIdAdapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
        CreateCustomSpinner(orderSpinner, orderListResult, OrderIdAdapter);

用于清除微调器选择的方法

public void clearOrderIDListSelection()
        {
            RemoveItemSeclectedEvent(this.orderSpinner);
            CreateCustomSpinner(orderSpinner, orderListResult, OrderIdAdapter);
            orderSpinner.SetSelection(-1);

        }

标签： androidxamarin

解决方案

clearOrderIDListSelection()在设置适配器之前调用。

设置适配器后调用此方法。

orderSpinner = (Spinner)view.FindViewById(Resource.Id.spinner_workOrder);
orderListResult = new List<string>();
orderListResult.Clear();
orderListResult.Add(Constants.EMPTY_STRING);
foreach (OrderModel orderData in orderIds)
    {
        orderListResult.Add(orderData.IDNo);
    }

OrderIdAdapter = new CustomSpinnerAdapter(context, Resource.Layout.ListItem, 
orderListResult, Constants.ORDER_LIST);
    OrderIdAdapter.SetDropDownViewResource(Android.Resource.Layout.SimpleSpinnerDropDownItem);
clearOrderIDListSelection();

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