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我正在實現一個listview，其中每個元素包含2個文本視圖和一個seekbar。這樣的佈局： 
BaseAdapter在滾動時更改值
活動有一個viewpager與3個不同的片段。 在片段3中，我使用listview來顯示自定義適配器。 列表中的項目數量是動態的，因此滾動條可能會出現。
如果滾動條存在，並且一個滾動某些視圖不再顯示並再次返回，則值有時會更改。 我知道這是由於適配器中GetView（）的重新創建。但我無法找到它改變的原因。
的過程應該是這樣的：
- 沒有什麼選擇：搜索條是灰色的，右邊TextView的顯示不 初始化選擇
- 事情：欄爲藍色，右TextView的搜索條進度
以下是的代碼自定義適配器：
class EntryAdapter : BaseAdapter<Entry>
{
List<Entry> mEntryList;
Activity mActivity;
ColorFilter grayFilter;
ColorFilter blueFilter;
public EntryAdapter(Activity activity, List<Entry> entryList) : base()
{
mEntryList = entryList;
mActivity = activity;
grayFilter = new PorterDuffColorFilter(Color.Gray, PorterDuff.Mode.SrcIn);
blueFilter = new PorterDuffColorFilter(Color.Blue, PorterDuff.Mode.SrcIn);
}
public override Entry this[int position]
{
get
{
return mEntryList[position];
}
}
public override int Count
{
get
{
return mEntryList.Count;
}
}
public override long GetItemId(int position)
{
return position;
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
View view = convertView;
if (view == null)
{
holder = new ViewHolder();
view = mActivity.LayoutInflater.Inflate(Resource.Layout.ListItem_Entry, null);
holder.Name = view.FindViewById<TextView>(Resource.Id.li_entry_tv_feature_name);
holder.Value = view.FindViewById<TextView>(Resource.Id.li_entry_tv_feature_value);
holder.Unit = view.FindViewById<TextView>(Resource.Id.li_entry_tv_feature_value_unit);
holder.Seeker = view.FindViewById<SeekBar>(Resource.Id.li_entry_sb_feature);
view.Tag = holder;
}
holder = (ViewHolder)view.Tag;
Entry current = mEntryList[position];
holder.Seeker.Max = current.Max + 1;
holder.Seeker.Progress = current.Value;
holder.Seeker.Tag = current;
holder.Name.Text = current.Name;
holder.Value.Text = Convert.ToString(current.Value);
holder.Seeker.ProgressChanged += delegate (object sender, SeekBar.ProgressChangedEventArgs e)
{
Entry entry = e.SeekBar.Tag as Entry;
if (e.Progress <= 0)
{
holder.Name.Text = entry.Name;
entry.Value = 0;
}
else
{
holder.Name.Text = entry.Name + " (" + entry.Unit + "):";
entry.Value = e.Progress - 1;
}
if (e.Progress <= 0)
{
holder.Value.Text = "Not initialized!";
holder.Seeker.ProgressDrawable.SetColorFilter(grayFilter);
holder.Seeker.Thumb.SetColorFilter(grayFilter);
}
else
{
holder.Value.Text = Convert.ToString(e.Progress - 1);
holder.Seeker.ProgressDrawable.SetColorFilter(blueFilter);
holder.Seeker.Thumb.SetColorFilter(blueFilter);
}
};
if (holder.Seeker.Progress <= 0)
{
holder.Name.Text = mEntryList[position].Name;
mEntryList[position].Value = 0;
}
else
{
holder.Name.Text = mEntryList[position].Name + " (" + mEntryList[position].Unit + "):";
mEntryList[position].Value = holder.Seeker.Progress;
}
if (holder.Seeker.Progress <= 0)
{
holder.Value.Text = "Not initialized!";
holder.Seeker.ProgressDrawable.SetColorFilter(grayFilter);
holder.Seeker.Thumb.SetColorFilter(grayFilter);
}
else
{
holder.Value.Text = Convert.ToString(holder.Seeker.Progress);
holder.Seeker.ProgressDrawable.SetColorFilter(blueFilter);
holder.Seeker.Thumb.SetColorFilter(blueFilter);
}
return view;
}
public class ViewHolder : Java.Lang.Object
{
public TextView Name { set; get; }
public TextView Value { set; get; }
public SeekBar Seeker { set; get; }
public Entry CurrentEntry { set; get; }
}
}
類條目看起來是這樣的：
class Entry : Java.Lang.Object, IParcelable
{
[ExportField ("CREATOR")]
static EntryCreator InitialieCreator()
{
return new EntryCreator();
}
public int Id { set; get; }
public int Max { set; get; }
public int Value { set; get; }
public string Name { set; get; }
public Entry()
{
}
public Entry (int id, int max, int value, string name)
{
Id = id;
Max = max;
Value = value;
Name = name;
}
public int DescribeContents()
{
return 0;
}
public void WriteToParcel(Parcel dest, [GeneratedEnum] ParcelableWriteFlags flags)
{
dest.WriteInt(Id);
dest.WriteInt(Max);
dest.WriteInt(Value);
dest.WriteString(Name);
}
public class EntryCreator : Java.Lang.Object, IParcelableCreator
{
public Java.Lang.Object CreateFromParcel(Parcel source)
{
return new Entry(source.ReadInt(), source.ReadInt(), source.ReadInt(), source.ReadString());
}
public Java.Lang.Object[] NewArray(int size)
{
return new Java.Lang.Object[size];
}
}
}
也許有人可以告訴我爲什麼值發瘋。從「未初始化」到「一切都是可能的，而滾動」。現在我已經坐了幾個星期了。