IllegalStateException异常：适配器的内容发生了变化，但ListView控件没有收到通知 [英] IllegalStateException: The content of the adapter has changed but ListView did not receive a notification

问题描述

我使用的是自定义ArrayAdapter设置上AutocompleteTextView适配器（AddressAdapter扩展ArrayAdapter）。

I'm using a custom ArrayAdapter to set the adapter on an AutocompleteTextView (AddressAdapter extends ArrayAdapter).

public class AutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
private ArrayList<String> mData;
ArrayList<String> listTempPrefix = new ArrayList<String>();
ArrayList<String> listTemp = new ArrayList<String>();
String valueText;
String[] words;
String ulcase;

public AutoCompleteAdapter(Context context, int textViewResourceId, ArrayList<String> bS) {
    super(context, textViewResourceId);
    mData = bS;//new ArrayList<String>();
}

@Override
public int getCount()
{
    synchronized (listTempPrefix)
    {
        return listTempPrefix.size();
    }
}

@Override
public String getItem(int index)  
{
    synchronized (listTempPrefix)
    {
        try {
            //Log.e("Error", listTempPrefix.get(index));
            return listTempPrefix.get(index);
        } catch(IndexOutOfBoundsException e) {
            Log.e("Error", "IndexOutOfBoundsException");
            return "";
        }
    }

}

@Override
public Filter getFilter()
{
    Filter myFilter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint)
        {

            FilterResults filterResults = new FilterResults();
            synchronized (filterResults)
            {
                listTempPrefix.clear();
                listTemp.clear();
                //Log.e("1", "1");

                try {
                if(constraint != null) {
                    // A class that queries a web API, parses the data and returns an ArrayList<Style>
                    //StyleFetcher fetcher = new StyleFetcher();
                    //try {
                        //mData = fetcher.retrieveResults(constraint.toString());
                    //}
                    //catch(Exception e) {}
                    // Now assign the values and count to the FilterResults object


                    for(String value: mData) {
                        valueText = value.toLowerCase();

                        //System.out.println("constraintH - " + constraint);

                        constraint.toString().toLowerCase();
                        ulcase = constraint.toString().toLowerCase();
                        //System.out.println("ulcase - " + ulcase);

                        if (valueText.startsWith(ulcase)) {
                            listTempPrefix.add(value);
                        } else {
                            words = valueText.split(" ");
                            //final int wordCount = words.length;

                            // Start at index 0, in case valueText starts with space(s)
                            for (int k = 0; k < words.length; k++) {
                                if (words[k].startsWith(ulcase)) {
                                    listTemp.add(value);
                                    break;
                                }
                            }
                        }

                        ///listTemp.add(mData.get(i));
                        //filterResults.count = mData.size();
           //           System.out.println("mData" + i + mData.get(i));
                    }
                    //Log.e("2", "2");
           //       System.out.println("size " + listTemp.size() + " value" + listTemp);

                    listTempPrefix.addAll(listTemp);

                    filterResults.values = listTempPrefix;

                    filterResults.count = listTempPrefix.size();
                    //System.out.println("size " + filterResults.count + " value" + filterResults.values);

                    //System.out.println("constraint" + constraint);

                }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    }
                return filterResults;
            }
        }

        @Override
        protected void publishResults(CharSequence contraint, FilterResults filterResults) 
        {
            synchronized (filterResults)
            {
                if(filterResults != null && filterResults.count > 0) {
                notifyDataSetChanged();
                //Log.e("notifyDataSetChanged", "notifyDataSetChanged");
                }
                else {
                    notifyDataSetInvalidated();
                    //Log.e("notifyDataSetInvalidated", "notifyDataSetInvalidated");
                }
            }
        }
    };
    return myFilter;
}

}

我该怎么有时：请注意，它真的发生了罕见。但我想摆脱这种错误完全。下面是部分堆栈跟踪：

What I got sometimes: please notice, it happens really rarely. But I'd like to get rid of this bug completely. Here is partial stacktrace:

java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(-1, class android.widget.AutoCompleteTextView$DropDownListView) with Adapter(class com.example.test.AutoCompleteAdapter)].

该问题可能从时，键盘的快速输入，法notifyDataSetChanged（）issn't调用。但是我'不知道。

The problem maybe that the fast input from keybord, method notifyDataSetChanged () issn't call. But i'am not sure.

推荐答案

更改publishResults到

Change publishResults to

@Override 
protected void publishResults(final CharSequence contraint, final FilterResults filterResults) { 
    listTempPrefix = (List) results.values;
    if(filterResults != null && filterResults.count > 0) {
        notifyDataSetChanged();
    } else {
        notifyDataSetInvalidated();
    }
}

这样的图形用户界面线程更新，而不是performFiltering结果它运行在后台线程。

This way the GUI thread updates the results instead of performFiltering which runs in a background thread.

卸下performFiltering listTemp preFIX参考，使用局部变量有存储结果，并通过FilterResults返回它们

Remove listTempPrefix references from performFiltering and use a local variable there to store the results and return them through FilterResults

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