快速删除文本时，Android AutoCompleteTextView崩溃

我有一个关键字列表(大约1000个单词)，并将其设置为由AutoCompleteTextView处理的ArrayAdapter。基本过程运行良好。当我选择一个长字(上面的10个字符)，然后使用键盘上的退格按钮删除该字(按住按钮不放)时，出现问题。当删除了5个字符后，应用崩溃并出现以下错误。

01-16 13:27:23.082: ERROR/AndroidRuntime(2874): FATAL EXCEPTION: main
        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$DropDownListView) with Adapter(class com.hdm_i.dm.corp.android.muenchen.adapters.PoiAutoCompleteAdapter)]
        at android.widget.ListView.layoutChildren(ListView.java:1527)
        at android.widget.AbsListView.onLayout(AbsListView.java:1430)
        at android.view.View.layout(View.java:7228)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:338)
        at android.view.View.layout(View.java:7228)
        at android.view.ViewRoot.performTraversals(ViewRoot.java:1145)
        at android.view.ViewRoot.handleMessage(ViewRoot.java:1865)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:130)
        at android.app.ActivityThread.main(ActivityThread.java:3687)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:507)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
        at dalvik.system.NativeStart.main(Native Method)

以下是我的代码，我做错了什么吗？预先感谢您的建议:-)

public class PoiAutoCompleteAdapter extends ArrayAdapter<SearchTextAutoSuggest> implements Filterable {

    private List<SearchTextAutoSuggest> searchTextAutoSuggestList = new ArrayList<SearchTextAutoSuggest>();
    private SearchTextAutoSuggest defaultSuggestion = new SearchTextAutoSuggest();

    private Handler uiThreadHandler;

    public PoiAutoCompleteAdapter(Context context, int viewResourceId, Handler uiThreadHandler) {
        super(context, viewResourceId);
        this.uiThreadHandler = uiThreadHandler;
        defaultSuggestion.setName(AppConstants.DEFAULT_SEARCH_STRING_NAME);
    }

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

    @Override
    public SearchTextAutoSuggest getItem(int position) {
        return searchTextAutoSuggestList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public Filter getFilter() {
        Filter filter = new Filter() {

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                synchronized (filterResults) {
                    if (constraint != null) {
                        // Clear and Retrieve the autocomplete results.
                        searchTextAutoSuggestList.clear();
                        searchTextAutoSuggestList = getFilteredResults(constraint);

                        // Assign the data to the FilterResults
                        filterResults.values = searchTextAutoSuggestList;
                        filterResults.count = searchTextAutoSuggestList.size();
                    }

                    return filterResults;
                }
            }

            @Override
            protected void publishResults(CharSequence constraint, final FilterResults filterResults) {
                uiThreadHandler.post(new Runnable() {
                    public void run() {
                        synchronized (filterResults) {
                            if (filterResults != null && filterResults.count > 0) {
                                notifyDataSetChanged();
                            } else {
                                Logs.e("Tried to invalidate");
                                notifyDataSetInvalidated();
                            }
                        }
                    }
                });
            }
        };
        return filter;
    }

    private List<SearchTextAutoSuggest> getFilteredResults(CharSequence constraint) {
        List<SearchTextAutoSuggest> searchTextAutoSuggestList = AppContext.searchTextAutoSuggestList;
        List<SearchTextAutoSuggest> filteredSearchTextAutoSuggestList = new ArrayList<SearchTextAutoSuggest>();

        // Assign constraint as a default option into the list
        defaultSuggestion.setLabel(getContext().getString(R.string.general_default_search_str) + " \'" + constraint + "\'");
        filteredSearchTextAutoSuggestList.add(defaultSuggestion);

        for (int i = 0; i < searchTextAutoSuggestList.size(); i++) {
            if (searchTextAutoSuggestList.get(i).getLabel().toLowerCase().startsWith(constraint.toString().toLowerCase())) {
                filteredSearchTextAutoSuggestList.add(searchTextAutoSuggestList.get(i));
            }
        }

        return filteredSearchTextAutoSuggestList;
    }

}

最佳答案

因为performFiltering在工作线程中执行。并且您在此线程中分配了searchTextAutoSuggestList变量，但是您只需要在UI线程中更改适配器的数据。另外publishResults方法在UI线程中执行，因此您在这里不需要任何处理程序。

@Override
protected FilterResults performFiltering(CharSequence constraint) {
    FilterResults filterResults = new FilterResults();
    synchronized (filterResults) {
        if (constraint != null) {
            // Clear and Retrieve the autocomplete results.
            List<SearchTextAutoSuggest> resultList = getFilteredResults(constraint);

            // Assign the data to the FilterResults
            filterResults.values = resultList;
            filterResults.count = resultList.size();
        }
        return filterResults;
    }
}

@Override
protected void publishResults(CharSequence constraint, final FilterResults filterResults) {
    if (filterResults != null && filterResults.count > 0) {
        searchTextAutoSuggestList.clear();
        searchTextAutoSuggestList = filterResults.values;
        notifyDataSetChanged();
    } else {
        Logs.e("Tried to invalidate");
        notifyDataSetInvalidated();
    }

}