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POsetFastScrollEnabled don't work perfectly
 

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  1. POsetFastScrollEnabled don't work perfectly
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    <p>I am working on an App that has a page with a listview and a edittext box at top. As you type things into the edittext box it will filter what items are shown in the listview. The problem I am having is with the fast scroll icon that appears on the side of the slider. The scroller go out the view when i type the letter "b for example.</p> <p><img src="https://i.stack.imgur.com/gAqKN.png" alt="enter image description here"></p> <p>I have added this lines (to refresh my list scroller) and it didn't work.</p> <pre><code>_filterText = (EditText) findViewById(R.id.search_box); _filterText.addTextChangedListener(new TextWatcher(){ public void afterTextChanged(Editable s) { _listView.setFastScrollEnabled(false); _listView.setFastScrollEnabled(true); } </code></pre> <p>i have also se this subject and follow it, and i guess it wasn't the same problem. <a href="https://stackoverflow.com/questions/10255624/android-fastscrollenabled-not-working-at-first">Android: fastScrollEnabled not working at first</a></p> <p>Ok, here is all my class:</p> <pre><code>public class StationsFragment extends GoogleAnalyticsFragment implements Observer{ private Boolean mDebug = true; private ListView _listView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { super.onCreateView( inflater, container, savedInstanceState ); activity = (FragmentsActivity) getActivity(); mStationsViewContainer = inflater.inflate(R.layout.stations_activity, null); _listView = (ListView) mStationsViewContainer.findViewById( R.id.stations_listView ); activity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN); _stationsAdapter = new StationsAdapter(); _listView.setAdapter(_stationsAdapter); _listView.setVerticalScrollBarEnabled(false); _listView.setFastScrollEnabled(true); _listView.setScrollingCacheEnabled(true); registerForContextMenu(_listView); _listView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { } }); _stationsList.addObserver(this); _filterText = (EditText) mStationsViewContainer.findViewById( R.id.search_box ); TextWatcher filterTextWatcher = new TextWatcher() { public void afterTextChanged(Editable s) { _listView.setFastScrollEnabled(false); _listView.setFastScrollEnabled(true); } public void beforeTextChanged(CharSequence s, int start, int count, int after) { } public void onTextChanged(CharSequence s, int start, int before, int count) { _filterMode = _filterText.getText().length() &gt; 0; _stationsAdapter.getFilter().filter(s); } }; _filterText.addTextChangedListener(filterTextWatcher); _stationsAdapter.getFilter().filter(""); } return mStationsViewContainer; } class StationsAdapter extends BaseAdapter implements SectionIndexer, Filterable { HashMap&lt;String, Integer&gt; _alphaIndexer; public ArrayList&lt;Station&gt; _filtered = new ArrayList&lt;Station&gt;(); String[] _sections; MyFilter _filter; public StationsAdapter() { super(); _filter = new MyFilter(); } public void updateIndex() { _alphaIndexer = new HashMap&lt;String, Integer&gt;(); for (int x = 0; x &lt; _filtered.size(); x++) { Station s = (Station) _filtered.get(x); // get the first letter of the store String ch = s.getTitle().substring(0, 1); // convert to uppercase otherwise lowercase a -z will be sorted // after upper A-Z ch = ch.toUpperCase(); if (!_alphaIndexer.containsKey(ch)) { if (_filterMode) { _alphaIndexer.put(ch, x); } else { _alphaIndexer.put(ch, x + _favouriteManager.getFavourites().length); } } } Set&lt;String&gt; sectionLetters = _alphaIndexer.keySet(); ArrayList&lt;String&gt; sectionList = new ArrayList&lt;String&gt;(sectionLetters); Collections.sort(sectionList); if (!_filterMode &amp;&amp; _favouriteManager.getFavourites().length &gt; 0) { sectionList.add(0, "\u2605"); } _sections = new String[sectionList.size()]; sectionList.toArray(_sections); if (!_filterMode &amp;&amp; _favouriteManager.getFavourites().length &gt; 0) { _alphaIndexer.put("\u2605", 0); } } public int getCount() { if (_filterMode) { if (mDebug) Log.i("StationFragment","filter size ="+_filtered.size()); return _filtered.size(); } else { return _filtered.size() + _favouriteManager.getFavourites().length; } } public Object getItem(int position) { if (_filterMode) { return _filtered.get(position); } else { if (position &lt; _favouriteManager.getFavourites().length) { return _favouriteManager.getFavourites()[position]; } else { return _filtered.get(position - _favouriteManager.getFavourites().length); } } } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { if (mDebug) Log.i("ks3","getView called, position is " + position); if (convertView == null) { LayoutInflater inflater = (LayoutInflater) activity.getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.stations_cell_custom, null); } if (!_filterMode) { if (position &lt; _favouriteManager.getFavourites().length) { Favourite favourite = _favouriteManager.getFavourites()[position]; Station station = _stationsList.findStationById(favourite.getFavouriteId()); TextView details = ((TextView) convertView.findViewById(R.id.details)); if (_pushedFromRoutes || _pushedFromWidgetConfiguration) { details.setVisibility(View.GONE); } else { details.setVisibility(View.VISIBLE); } TextView name = ((TextView) convertView.findViewById(R.id.name)); if (station != null) { name.setText(station.getName()); //name.setTextColor(getResources().getColor(R.color.stations_list_favourite_text_color)); } else { name.setText(""); } details.setText(favourite.getUserSettings().formattedDateTime()); TextView header = ((TextView) convertView.findViewById(R.id.header_textview)); View headerBar = ((View) convertView.findViewById(R.id.header_bar)); if (position == 0) { header.setVisibility(View.VISIBLE); headerBar.setVisibility(View.VISIBLE); header.setText(getString(R.string.star_favourites)); } else { header.setVisibility(View.GONE); headerBar.setVisibility(View.GONE); header.setText(null); } } else { Station station = _filtered.get(position - _favouriteManager.getFavourites().length); TextView name = ((TextView) convertView.findViewById(R.id.name)); name.setText(station.getName()); name.setTextColor(getResources().getColor(R.color.stations_list_text_color)); ((TextView) convertView.findViewById(R.id.details)).setVisibility(View.GONE); TextView header = ((TextView) convertView.findViewById(R.id.header_textview)); View headerBar = ((View) convertView.findViewById(R.id.header_bar)); String firstLetter = station.getTitle().substring(0, 1); /*if (position == _alphaIndexer.get(firstLetter)) { TextView header = (TextView) activity.findViewById(R.id.header_textview); header.setText(firstLetter); }*/ if (position == _alphaIndexer.get(firstLetter)) { header.setVisibility(View.VISIBLE); headerBar.setVisibility(View.VISIBLE); header.setText(firstLetter); } else { header.setVisibility(View.GONE); headerBar.setVisibility(View.GONE); header.setText(null); } } } else { Station station = _filtered.get(position); TextView name = ((TextView) convertView.findViewById(R.id.name)); name.setText(station.getName()); name.setTextColor(getResources().getColor(R.color.stations_list_text_color)); ((TextView) convertView.findViewById(R.id.details)).setVisibility(View.GONE); TextView header = ((TextView) convertView.findViewById(R.id.header_textview)); View headerBar = ((View) convertView.findViewById(R.id.header_bar)); String firstLetter = station.getTitle().substring(0, 1); if (position == _alphaIndexer.get(firstLetter)) { header.setVisibility(View.VISIBLE); headerBar.setVisibility(View.VISIBLE); header.setText(firstLetter); } else { header.setVisibility(View.GONE); headerBar.setVisibility(View.GONE); header.setText(null); } } return convertView; } public int getPositionForSection(int section) { return _alphaIndexer.get(_sections[section]); } public int getSectionForPosition(int position) { return 0; } public Object[] getSections() { return _sections; } @Override public Filter getFilter() { return _filter; } class MyFilter extends Filter { @Override public CharSequence convertResultToString(Object resultValue) { if (resultValue != null) { Station station = (Station) resultValue; if (station != null) { return station.getTitle(); } } return null; } @Override protected FilterResults performFiltering(CharSequence constraint) { String pattern = constraint.toString().toLowerCase(); FilterResults result = new FilterResults(); ArrayList&lt;Station&gt; filt = new ArrayList&lt;Station&gt;(); if (_pushedFromRoutes || _pushedFromWidgetConfiguration) { synchronized (_stationsList.stations()) { for (int i = 0, l = _stationsList.stations().length; i &lt; l; i++) { Station s = _stationsList.stations()[i]; if (pattern == null || pattern.length() == 0 || s.match(pattern)) filt.add(s); } result.count = filt.size(); result.values = filt; } } else { synchronized (_stationsList.belgianStations()) { for (int i = 0, l = _stationsList.belgianStations().length; i &lt; l; i++) { Station s = _stationsList.belgianStations()[i]; if (pattern == null || pattern.length() == 0 || s.match(pattern)) filt.add(s); } result.count = filt.size(); result.values = filt; } } return result; } @SuppressWarnings("unchecked") @Override protected void publishResults(CharSequence constraint, FilterResults results) { _filtered = (ArrayList&lt;Station&gt;) results.values; updateIndex(); _listView.setFastScrollEnabled(false); notifyDataSetChanged(); _listView.setFastScrollEnabled(true); if (mDebug) Log.i("StationFragment","list count ="+_listView.getCount()); if (_filterMode &amp;&amp; _filtered.size() == 0) { _listView.setVisibility(View.GONE); _noResultsTextView.setVisibility(View.VISIBLE); } else { _listView.setVisibility(View.VISIBLE); _noResultsTextView.setVisibility(View.GONE); } } } } } </code></pre> <p>You see that i have to generate a complex list, i think that the problem may come from this, maybe scroller can get the max and the min? i really don't get it?</p> <p>I tried my code in an activity (i thunked that maybe problem comes from fragment) and when i test it , it still don't work in my tablet Samsung Galaxy. i tried it in a Nexus S and it worked. The problem i must use this code in a fragment and it must work in the tablet especially GalaxyTab.</p>
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    1. COThis often happens when the code to update or filter the list is done in such a way the the `FastScroller` object does not get notified. Can you post the code snippets where you update your `ListAdapter` based on data set changes and/or text input filtration?
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    2. COi have added my listAdapter, please check it. Thanks a lot
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