Question

我无法在使用SimpleCursorAdapter创建的列表视图中找到删除的答案所以我将这个列表视图放在一个片段中，这里是代码

public List<tblMenu> GetChildMenusClass()
{
    var UserInfo = GetUserInfo();
    UserType = UserInfo[0].UserTypeID;          
    List<tblUserMenuMapping> MenuMapping = GetMenuIdFromUserMenuMappings();

    List<string> MenuMappingMenuId= new List<string>();
    for (int i = 0; i < MenuMapping.Count; i++)
    { 
        MenuMappingMenuId.Add(MenuMapping[i].MenuID.ToString());
    }

    List<tblRoleMenuMapping> RoleMapping = GetMenuIdFromRoleMenuMappings();
    List<string> RoleMenuId = new List<string>();
    for (int i = 0; i < RoleMapping.Count; i++)
    {
        RoleMenuId.Add(RoleMapping[i].MenuID.ToString());
    }

    var menus = DataAccess.Menus.FindByExp(Menus => ((Menus.IsDeleted == false) &&
         (DataAccess.UserMenuMappings.FindByExp(UserMenuMapping => (UserMenuMapping.UserID == Global.CurrentProfile.UserID))
         .Select(UserMenuMapping => new { MenuID = UserMenuMapping.MenuID }).Contains(new { MenuID = Menus.MenuID }) ||
          DataAccess.RoleMenuMappings.FindByExp(RoleMenuMapping => DataAccess.UserRoleMappings.FindByExp(UserRoleMapping => (UserRoleMapping.UserID == Global.CurrentProfile.UserID))
         .Select(UserRoleMapping => new { RoleID = UserRoleMapping.RoleID }).Contains(new { RoleID = RoleMenuMapping.RoleID }))
         .Select(RoleMenuMapping => new { MenuID = RoleMenuMapping.MenuID }).Contains(new { MenuID = Menus.MenuID }))))
         .Select(Menus => new tblMenu { MenuID = Menus.MenuID, MenuName = Menus.MenuName }).ToList();

    return menus;
}

谢谢。

Answer 1

从数据库中删除并刷新列表视图。

Answer 2

您必须更新传递给适配器的列表，然后调用adapter.notifyDataSetChanged()

Answer 3

使用swapCursor()方法更新SimpleCursorAdapter：

中的数据

myDb.getWriteableDatabase().delete(TABLE_NAME, KEY_ID + "=?", position);
Cursor newCursor = myDb.getReadableDatabase().query(**etc.**);
dataAdapter.swapCursor(newCursor);

如何使用OnItemLongClickListener（）从SQLite创建的listview中删除项目？

3 个答案: