我有一个自动完成控件,该控件将从api绘制以构建自动完成下拉列表。我已经把所有东西都整理好了,但是在输入时出现了这个错误:
03-26 13:41:40.546 E / AndroidRuntime(31931):java.lang.IndexOutOfBoundsException:索引:0,大小:0 03-26 13:41:40.546 E / AndroidRuntime(31931):at java.util.ArrayList.get(ArrayList.java:437) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.ArrayAdapter.getItem(ArrayAdapter.java:385) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.AutoCompleteTextView.buildImeCompletions(AutoCompleteTextView.java:1243) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.AutoCompleteTextView.showDropDown(AutoCompleteTextView.java:1203) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.AutoCompleteTextView.updateDropDownForFilter(AutoCompleteTextView.java:1086) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.AutoCompleteTextView.onFilterComplete(AutoCompleteTextView.java:1068) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.widget.Filter $ ResultsHandler.handleMessage(Filter.java:285) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.os.Handler.dispatchMessage(Handler.java:106) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.os.Looper.loop(Looper.java:164) 03-26 13:41:40.546 E / AndroidRuntime(31931):位于android.app.ActivityThread.main(ActivityThread.java:6494) 03-26 13:41:40.546 E / AndroidRuntime(31931):at java.lang.reflect.Method.invoke(本机方法)> 03-26 13:41:40.546 E / AndroidRuntime(31931):在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run(RuntimeInit.java:438) 03-26 13:41:40.546 E / AndroidRuntime(31931):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
我的适配器类
public class UserFilterAdapter : ArrayAdapter<UserAutoComplete>, IFilterable
{
private readonly Context _context;
private readonly int _textViewResourceId;
private readonly Filter _filter;
private List<UserAutoComplete> _userAutoComplete;
public override int Count => _userAutoComplete?.Count ?? 0;
public override Filter Filter => _filter;
public DirectoryOrgUnitFilterAdapter(List<UserAutoComplete> userAutoComplete, Context context, int textViewResourceId) : base(context, textViewResourceId)
{
_context = context;
_filter = new UserAutoCompleteFilter(this);
_textViewResourceId = textViewResourceId;
_userAutoComplete = userAutoComplete;
}
public void RefreshAdapter(List<UserAutoComplete> userAutoComplete)
{
_userAutoComplete = userAutoComplete;
NotifyDataSetChanged();
}
public override View GetView(int position, View convertView, ViewGroup parent)
{
if (convertView == null)
{
var inflater = (LayoutInflater) _context.GetSystemService(Context.LayoutInflaterService);
convertView = inflater.Inflate(_textViewResourceId, parent, false);
}
var itemName = convertView.FindViewById<TextView>(Resource.Id.user_autocomplete_item_name);
var itemType = convertView.FindViewById<TextView>(Resource.Id.user_autocomplete_item_type);
var item = GetItem(position);
itemName.Text = item.UserName;
itemType.Text = item.Email;
return convertView;
}
}
我的过滤器类
public class UserAutoCompleteFilter : Filter
{
private readonly UserFilterAdapter _adapter;
public UserAutoCompleteFilter(UserFilterAdapter adapter)
{
_adapter = adapter;
}
protected override FilterResults PerformFiltering(ICharSequence constraint)
{
var results = new FilterResults();
if (string.IsNullOrEmpty(constraint?.ToString()))
{
return results;
}
var searchFor = constraint.ToString();
if (searchFor.Length < 3)
{
return results;
}
var matches = ApiService.GetUsers(searchFor).ConfigureAwait(false).GetAwaiter().GetResult();
results.Values = FromArray(matches.Select(r => r.ToJavaObject()).ToArray());
results.Count = matches.ToList().Count;
constraint.Dispose();
return results;
}
protected override void PublishResults(ICharSequence constraint, FilterResults results)
{
if (results?.Values == null)
{
return;
}
using (var values = results.Values)
{
_adapter.RefreshAdapter(values.ToArray<Object>().Select(a => a.ToNetObject<UserAutoComplete>()).ToList());
}
constraint.Dispose();
results.Dispose();
}
}
我通过逻辑进行了调试,并且过滤器被命中并返回了数据,所以我迷失了丢失数据的地方并抛出了异常。
我已经按照this教程进行过滤,以使其能够在C#中工作,然后遵循了this教程,将其应用于自动完成的textview控件。
答案 0 :(得分:0)
我终于开始工作了。关键问题是我的适配器正在使用ArrayAdapter
而不是BaseAdapter
。
一旦我将其关闭,它就会按预期工作,不确定为什么我不能使用ArrayAdapter
,但我为我的自动完成控件终于可以正常工作而感到非常兴奋。