18

11-06 19:52:25.958: E/AndroidRuntime(29609): java.lang.IllegalStateException: 适配器的内容已更改，但 ListView 未收到通知。确保适配器的内容不是从后台线程修改的，而只是从 UI 线程修改的。[在 ListView(-1, class android.widget.ListPopupWindow$DropDownListView) with Adapter(class com.example.parkfoxxlight_android.PlacesAutoCompleteAdapter)]

完整日志： http: //pastebin.com/Hx7k28Rm

适配器的完整代码：http: //pastebin.com/TfH1bXE3我正在使用来自https://developers.google.com/places/training/autocomplete-android的示例，它具有相当的默认代码，所以似乎有一个谷歌代码中的错误？

该应用程序仅有时会因上述错误消息而崩溃。

protected void publishResults(CharSequence constraint,
        FilterResults results) {

    if (results != null && results.count > 0) {
        notifyDataSetChanged();
    } else {
        notifyDataSetInvalidated();
    }
}

活动http://pastebin.com/FYzYtvXY：

public class CityActivity extends Activity{

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.city);

            AutoCompleteTextView autoCompView = (AutoCompleteTextView) findViewById(R.id.autocomplete_city);

            PlacesAutoCompleteAdapter ad = new PlacesAutoCompleteAdapter(this);
            ProgressBar b = (ProgressBar)findViewById(R.id.progressBar1);
            ad.setLoadingIndicator(b);

            autoCompView.setAdapter(ad);
        }
}

任何想法如何解决这一问题？我在安卓 4.3 上。

4

2 回答 2

37

Filter'performFiltering()方法在后台线程上运行，并且您正在更改适配器resultList所基于的方法。如果您更改该数据列表并在那时ListView访问适配器，它将看到某些东西在它不知情的情况下发生了变化（并且它不会高兴）。您应该避免resultList在performFiltering方法中使用，而只需创建一个新的临时列表：

// in the performFiltering method which runs on a background thread:
@Override
protected FilterResults performFiltering(CharSequence constraint) {
     FilterResults filterResults = new FilterResults();
     ArrayList<String> queryResults;
     if (constraint != null && constraint.length() > 0) {
         queryResults = autocomplete(constraint);
     } else {
         queryResults = new ArrayList<String>(); // empty list/no suggestions showing if there's no valid constraint
     }
     filterResults.values = queryResults;
     filterResults.count = queryResults.size();
     return filterResults; // ## Heading ##
}

private List<String> autocomplete(String input) {
   // don't use the here the resultList List on which the adapter is based!
   // some custom code to get items from http connection
     ArrayList<String> queryResults = new ArrayList<String>(); // new list
     queryResults.add("Some String");
     return queryResults;
}

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
     // update the data with the new set of suggestions
     resultList = (ArrayList<String>)results.values;
     if (results.count > 0) {
         notifyDataSetChanged();
     } else {
         notifyDataSetInvalidated();
     }
}
于 2013-11-09T13:28:59.460 回答
0

试试这个（只是猜测）：

@Override
    public Filter getFilter() {
        Filter filter = new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults filterResults = new FilterResults();
                if (constraint != null) {
                    ArrayList list = autocomplete(constraint.toString());
                    if (list != null) {
                        filterResults.values = list;
                        filterResults.count = list.size();
                    }
                }
                return filterResults;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                if (results != null && results.count > 0) {
                    //change the underlying data immediately before notifying UI                        
                    resultList = (ArrayList)results.values; 
                    notifyDataSetChanged();
                }
                else {
                    notifyDataSetInvalidated();
                }
            }};
        return filter;
    }
于 2013-11-06T19:56:52.113 回答