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POScrollbar disappears when using SectionIndexer at specific sections on HoneyComb
 

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  1. POScrollbar disappears when using SectionIndexer at specific sections on HoneyComb
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    <p>I'm using adapter for <code>ListView</code> that implements <code>SectionIndexer</code>. <code>ListView</code> has <code>fastScrollEnabled</code> set to true in xml file. Everything works great on Android 2.2 and 2.3, but when I test my application on a tablet with Android 3.0, at some sections scrollbar disappears. For example when I scroll down the list, at elements beginning with letters A-B scrollbar is visible, but for letters C-H it's not, and then after H again visible. </p> <p>This adapter is made for sorting content alphabetically in ListView so that fastscroll can be used. </p> <p>Application is designed for API Level 8, so I couldn't use fastScrollAlwaysVisible.</p> <p>Here is a code of my adapter:</p> <pre><code>public class AlphabetSimpleAdapter extends SimpleAdapter implements SectionIndexer { private HashMap&lt;String, Integer&gt; charList; private String[] alphabet; public Typeface tfSansMedium; public Context mContext; public int mResource; public int[] mTo; public List&lt;? extends Map&lt;String, ?&gt;&gt; mData; public String mTitleKey; public AlphabetSimpleAdapter(Context context, List&lt;? extends Map&lt;String, ?&gt;&gt; data, int resource, String[] from, int[] to, String titleKey /* key sent in hashmap */) { super(context, data, resource, from, to); mData = data; mTitleKey = titleKey; mContext = context; mResource = resource; mTo = new int[to.length]; for ( int i = 0; i &lt; to.length; i ++) { mTo[i] = to[i]; } charList = new HashMap&lt;String, Integer&gt;(); int size = data.size(); tfSansMedium = Typeface.createFromAsset(context.getAssets(), "fonts/VitesseSans-Medium.otf"); for(int i = 0; i &lt; size; i++) { // Parsing first letter of hashmap element String ch = data.get(i).get(titleKey).toString().substring(0, 1); ch = ch.toUpperCase(); if(!charList.containsKey(ch)) { charList.put(ch, i); // Using hashmap to avoid duplicates } } Set&lt;String&gt; sectionLetters = charList.keySet(); // A set of all first letters ArrayList&lt;String&gt; sectionList = new ArrayList&lt;String&gt;(sectionLetters); // Creating arraylist to be able to sort elements Collections.sort(sectionList, Collator.getInstance(new Locale("pl", "PL"))); // Sorting elements alphabet = new String[sectionList.size()]; sectionList.toArray(alphabet); } // Methods required by SectionIndexer @Override public View getView(int position, View convertView, ViewGroup parent) { View v = convertView; if (v == null) { LayoutInflater li = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); v = li.inflate(mResource, null); } for (int i = 0; i &lt; mTo.length; i ++) { TextView tv = (TextView)v.findViewById(mTo[i]); if (tv != null) tv.setTypeface(tfSansMedium); } return super.getView(position, v, parent); } @Override public int getPositionForSection(int section) { if(!(section &gt; alphabet.length-1)) { return charList.get(alphabet[section]); } else { return charList.get(alphabet[alphabet.length-1]); } } @Override public int getSectionForPosition(int position) { return charList.get(mData.get(position).get(mTitleKey).toString().substring(0, 1)); } @Override public Object[] getSections() { return alphabet; } } </code></pre> <p><code>charList</code> is a HashMap where I store letters with their last appearing index so when I have 6 elements starting with letter "A", the value for key "A" is 5 and so on. </p> <p><code>alphabet</code> is a String array with all existing first letters.</p>
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    1. USPiotr Chojnacki
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      1. USdziwna
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    1. CODid you figure this out? I'm working on same issue. It hink my issue was with the getSectionForPosition method.
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      1. USKickingLettuce
    2. COUnfortunately not. Spent many hours on figuring this out, but finally had to leave it as it was.
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      1. POScrollbar disappears when using SectionIndexer at specific sections on HoneyComb
      1. USPiotr Chojnacki
    3. COThis issue has already been mentioned here: http://stackoverflow.com/a/13470842/1140682
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      1. USsaschoar
 

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