Question

我正在尝试修改MvxSpinner以设置默认值 “ 选择一个值 ”。
我提到this solution来覆盖这些方法，但我是无法覆盖方法。

如何以优雅的方式实现这一目标

XML

<Mvx.MvxSpinner
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30dp"
        android:background="@drawable/dropdown"
        local:MvxBind="ItemsSource Cruise; SelectedItem CruiseLineSelected; Visible CruiseAndShipSelectionVisibility"
        local:MvxItemTemplate="@layout/spinner_cruise_list"
        local:MvxDropDownItemTemplate="@layout/spinner_cruise_list"
        android:text="Select a cruise"
        android:layout_marginBottom="20dp"
        android:id="@+id/mvxSpinnerCruise" />

Answer 1

我找到一个简单的解决方案来设置Mvvm的默认文本并且它工作正常，我认为您可以使用public class MySpinnerAdapter<T> : ArrayAdapter<T> { private Context mContext; private int mTextResourceId; public MySpinnerAdapter(Context context, int textViewResourceId):base(context,textViewResourceId) { mContext = Context; mTextResourceId = textViewResourceId; } public override View GetView(int position, View convertView, ViewGroup parent) { View view = base.GetView(position, convertView, parent); if (position == Count) { TextView a = (view.FindViewById<TextView>(Android.Resource.Id.Text1)); a.Text = ""; TextView b = (view.FindViewById<TextView>(Android.Resource.Id.Text1)); b.Hint = GetItem(Count).ToString(); //"Hint to be displayed" } return view; } public override int Count => (base.Count - 1); }自己实现此功能，这里是代码：

spinner = FindViewById<Spinner>(Resource.Id.spinner);
var adapter = new MySpinnerAdapter<string>(this, Android.Resource.Layout.SimpleSpinnerDropDownItem);

adapter.Add("php");
adapter.Add("java");
adapter.Add("C++");
adapter.Add("C");
adapter.Add("Select a cruise");

spinner.Adapter = adapter;
spinner.SetSelection(adapter.Count); //display hint

使用时：

Spinner

Here是$this->getDataSource()->config['database']。

如何为MvxSpinner设置默认值

1 个答案: