android-AutoCompleteTextView隐藏和显示适配器更改下拉列表

概述我有一个AutoCompleteTextView,它从具有AsyncTask的API中获取建议.在onPostExecute中,我创建了一个新适配器,将其设置为AutoCompleteTextView并向适配器通知数据集更改.在TextWatcher中,我执行AsyncTask.一切正常,除了在每次更换适配器时关闭下拉菜单并显示下拉菜单.即使数据发

我有一个autoCompleteTextVIEw,它从具有AsyncTask的API中获取建议.
在onPostExecute中,我创建了一个新适配器,将其设置为autoCompleteTextVIEw并向适配器通知数据集更改.

在TextWatcher中,我执行AsyncTask.

一切正常,除了在每次更换适配器时关闭下拉菜单并显示下拉菜单.

即使数据发生更改,我如何也可以保持下拉菜单打开？

searchText.addTextChangedListener(new TextWatcher() {        @OverrIDe        public voID onTextChanged(CharSequence s, int start, int before, int count) {            // Todo auto-generated method stub        }        @OverrIDe        public voID beforeTextChanged(CharSequence s, int start, int count,                int after) {            // Todo auto-generated method stub        }        @OverrIDe        public voID afterTextChanged(Editable s) {            if (s.length() > 0) {                searchPlacesTask.cancel(true);                searchPlacesTask = new SearchPlacesTask();                searchPlacesTask.execute(s.toString().replace(" ", "-"));            } else {                searchPlacesTask.cancel(true);                searchPlacesTask = new SearchPlacesTask();                searchPlacesTask.execute();            }        }    });private class SearchPlacesTask extends AsyncTask<String, VoID, PlacesAPIResult> {    @OverrIDe    protected PlacesAPIResult doInBackground(String... params) {        PlacesAPIResult result = new PlacesAPIResult();        if (params.length > 0) {            places = PlacesAPIRestMethod.placeautocomplete(params[0], currentLocation.getLatitude(), currentLocation.getLongitude(),                     500, null, result);        } else {            places = PlacesAPIRestMethod.placeSearch(currentLocation.getLatitude(), currentLocation.getLongitude(), 0, true, result);        }        return result;    }    @OverrIDe    protected voID onPostExecute(PlacesAPIResult result) {        if (result.getResult() == PlacesAPIResult.OK) {            adapter = new PlaceAdapter(ChooseLocationActivity.this, R.layout.locationrow, places);            searchText.setAdapter(adapter);            adapter.notifyDataSetChanged();        }    }}

解决方法:

在适配器中实现Filterable,并添加此代码.

public class listadapter extends ArrayAdapter<String> implements Filterable{    private List<String> ListResult;    ...    @OverrIDe    public Filter getFilter() {        Filter filter = new Filter() {            @OverrIDe            protected FilterResults performFiltering(CharSequence constraint) {                FilterResults filterResults = new FilterResults();                if (constraint != null) {                    // Assign the data to the FilterResults                    filterResults.values = ListResult;                    filterResults.count = ListResult.size();                    }                return filterResults;                }            @OverrIDe            protected voID publishResults(CharSequence constraint, FilterResults results) {                if (results != null && results.count > 0) {                    notifyDataSetChanged();                }                else {                    notifyDataSetInvalIDated();                }            }};        return filter;    }}

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