Android Xamarin - ListView适配器与ObservableCollection

即时通讯Xamarin开发基本的Android应用程序，其中我有ListView与ListItem设置在适配器。但是当我删除或编辑任何项目时，listview不会自行刷新。我知道ObservableCollection，但我不知道如何将它与适配器一起使用。有人能帮助我吗？ Im在Xamarin中是新的。Android Xamarin - ListView适配器与ObservableCollection

适配器：

public class MealsAdapter : BaseAdapter<Meal> 
{ 
    List<Meal> items; 
    Activity context; 

    public MealsAdapter(Activity context, List<Meal> items) 
     : base() 
    { 
     this.context = context; 
     this.items = items; 
    } 

    public override Meal this[int position] 
    { 
     get 
     { 
      return items[position]; 
     } 
    } 

    public override int Count 
    { 
     get 
     { 
      return items.Count; 
     } 
    } 

    public override long GetItemId(int position) 
    { 
     return position; 
    } 

    public override View GetView(int position, View convertView, ViewGroup parent) 
    { 
     var item = items[position]; 

     View view = convertView; 
     if (view == null) 
      view = context.LayoutInflater.Inflate(Resource.Layout.MealListItem, null); 
     view.FindViewById<TextView>(Resource.Id.textViewNazev).Text = item.Name; 
     view.FindViewById<TextView>(Resource.Id.textViewBilkoviny).Text = context.Resources.GetString(Resource.String.BilkovinyNadpis) + ": " + item.Bilkoviny.ToString(); 
     view.FindViewById<TextView>(Resource.Id.textViewSacharidy).Text = context.Resources.GetString(Resource.String.SacharidyNadpis) + ": " + item.Sacharidy.ToString(); 

     return view; 
    } 
}

的ListView：

ListView listView;  
protected override void OnCreate(Bundle savedInstanceState) 
      { 
       base.OnCreate(savedInstanceState); 
       SetContentView(Resource.Layout.MealsSettings); 

       listView = FindViewById<ListView>(Resource.Id.listViewJidlo); 

       listView.Adapter = new MealsAdapter(this, DataStorage.meallist); 
       listView.ItemClick += ListView_ItemClick; 
      }

DataStorage.meallist是简单列表。我已经尝试把ObservableCollection放到适配器和DataStorage.meallist中，但它没有帮助。

来源

2016-12-26 Mik Big

您将需要致电NotifyDataSetChanged()让ListView知道它的集合已更改。

无论您在删除/删除List<Meal> items中的物品，请务必在事后致电NotifyDataSetChanged()。

来源

2016-12-27 22:12:21 therealjohn

Android Xamarin - ListView适配器与ObservableCollection

回答

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