【发布时间】：2016-08-31 04:27:56
【问题描述】：
所以我有一个为 Xamarin-Android 制作的自定义 ListView，它从员工轮班列表中获取数据并将它们转换为行。一些数据立即被错误地报告，（显示他们没有的变化），并且在滚动时数据会定期变化。
基本上，我向适配器传递了一个员工列表，每个员工都有一个包含开始和结束时间的列表类型。适配器循环遍历每个班次，使用开关将它所在的任何一天路由到正确的 TextView，然后粘贴数据。由于某种原因，某些行的数据显示不正确，但其他行很好。当您单击该行时（我有一个单独的视图来编辑数据），数据会正确地反映它应该是什么。我试图单步执行并弄清楚发生了什么，但是在单步执行时显示行正在正确返回。
在数据显示不正确的情况下，上下滚动时，当一行离开屏幕时，有时会返回不同的数据。
这是适配器代码：
using System;
using System.Collections.Generic;
using Android.Content;
using Android.Views;
using Android.Widget;
namespace MaydSchedulerApp
{
class ScheduleAdapter : BaseAdapter<EmployeeScheduleWrapper>
{
private List<EmployeeScheduleWrapper> mItems;
private Context mContext;
private bool sun = false, mon = false, tue = false, wed = false, thu = false, fri = false, sat = false;
public ScheduleAdapter(Context context, List<EmployeeScheduleWrapper> items)
{
mItems = items;
mContext = context;
}
public override int Count
{
get
{
return mItems.Count;
}
}
public override long GetItemId(int position)
{
return position;
}
public override EmployeeScheduleWrapper this[int position]
{
get
{
return mItems[position];
}
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
View row = convertView;
if (row == null)
{
row = LayoutInflater.From(mContext).Inflate(Resource.Layout.ScheduleListView, null, false);
}
TextView txtName = row.FindViewById<TextView>(Resource.Id.txtScheduleName);
txtName.Text = mItems[position].lName + ", " + mItems[position].fName;
TextView txtPosition = row.FindViewById<TextView>(Resource.Id.txtSchedulePosition);
txtPosition.Text = CoreSystem.GetPositionName(mItems[position].position);
TextView txtSunday = row.FindViewById<TextView>(Resource.Id.txtSun);
TextView txtMonday = row.FindViewById<TextView>(Resource.Id.txtMon);
TextView txtTuesday = row.FindViewById<TextView>(Resource.Id.txtTue);
TextView txtWednesday = row.FindViewById<TextView>(Resource.Id.txtWed);
TextView txtThursday = row.FindViewById<TextView>(Resource.Id.txtThu);
TextView txtFriday = row.FindViewById<TextView>(Resource.Id.txtFri);
TextView txtSaturday = row.FindViewById<TextView>(Resource.Id.txtSat);
for (int i = 0; i < mItems[position].shiftList.Count; i++)
{
switch (mItems[position].shiftList[i].date)
{
case DayOfWeek.Sunday:
txtSunday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
sun = true;
break;
case DayOfWeek.Monday:
txtMonday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
mon = true;
break;
case DayOfWeek.Tuesday:
txtTuesday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
tue = true;
break;
case DayOfWeek.Wednesday:
txtWednesday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
wed = true;
break;
case DayOfWeek.Thursday:
txtThursday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
thu = true;
break;
case DayOfWeek.Friday:
txtFriday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
fri = true;
break;
case DayOfWeek.Saturday:
txtSaturday.Text = mItems[position].shiftList[i].startShift.ToString() + "00 - " + mItems[position].shiftList[i].endShift.ToString() + "00";
sat = true;
break;
}
}
if (!sun)
txtSunday.Text = "Off";
if (!mon)
txtMonday.Text = "Off";
if (!tue)
txtTuesday.Text = "Off";
if (!wed)
txtWednesday.Text = "Off";
if (!thu)
txtThursday.Text = "Off";
if (!fri)
txtFriday.Text = "Off";
if (!sat)
txtSaturday.Text = "Off";
return row;
}
}
}
这里是 EmployeeScheduleWrapper 的代码
using System;
using System.Collections;
using System.Collections.Generic;
namespace MaydSchedulerApp
{
public class EmployeeScheduleWrapper
{
public string lName, fName;
public int employee;
public int position;
public int hourTarget;
public int skill;//This is to minimize callbacks to the main emp later
public int scheduledHours;
//The availability is copied onto this so that it can be modified without effecting the set availability in the employee type
public Availability availability = new Availability();
public bool availabilityModified = false;
public List<Shift> shiftList = new List<Shift>();
public EmployeeScheduleWrapper() { }
public EmployeeScheduleWrapper(Employee emp)
{
lName = emp.empLastName;
fName = emp.empFirstName;
employee = emp.empID;
position = emp.position;
skill = emp.skillLevel;
hourTarget = emp.hourTarget;
scheduledHours = 0;
//availability = emp.availability;//Dont init this unless its changed and needs to be saved
availabilityModified = false;
}
public void SetTempAvailability(Availability avail)//TODO add check for when avail last changed to warn user if availability is no longer useful
{
availability = avail;
availabilityModified = true;
}
public void PermanentAvailabilityChange(Availability avail)
{
availability = avail;
availabilityModified = false;//since were using the permanent change
EmployeeStorage.GetEmployee(employee).availability = avail;
}
public Availability GetEntireAvail()
{
if (availabilityModified)
return availability;
else
{//This fixes the direct memory interaction when modifying temp availability
availability = new Availability(EmployeeStorage.GetEmployee(employee).availability);
return availability;
}
}
public bool GetAvailability(int day)
{
if (availabilityModified)
{
switch (day)
{
case 0:
return availability.sunday.available;
case 1:
return availability.monday.available;
case 2:
return availability.tuesday.available;
case 3:
return availability.wednesday.available;
case 4:
return availability.thursday.available;
case 5:
return availability.friday.available;
case 6:
return availability.saturday.available;
default:
Console.WriteLine("Invalid case chosen! :: EmployeeManagement/Employee.cs :: GetAvailability(int day): Invalid Value for Day Thrown! :: Returning false!");
break;
}
return false;
}
else
{
return EmployeeStorage.GetEmployee(employee).GetAvailability(day);
}
}
}
}
【问题讨论】：