java - Scrollbar disappears when using SectionIndexer at specific sections on HoneyComb -

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i'm using adapter listview implements sectionindexer. listview has fastscrollenabled set true in xml file. works great on android 2.2 , 2.3, when test application on tablet android 3.0, @ sections scrollbar disappears. example when scroll down list, @ elements beginning letters a-b scrollbar visible, letters c-h it's not, , after h again visible.

this adapter made sorting content alphabetically in listview fastscroll can used.

application designed api level 8, couldn't use fastscrollalwaysvisible.

here code of adapter:

public class alphabetsimpleadapter extends simpleadapter implements sectionindexer {      private hashmap<string, integer> charlist;     private string[] alphabet;     public typeface tfsansmedium;     public context mcontext;      public int mresource;     public int[] mto;     public list<? extends map<string, ?>> mdata;     public string mtitlekey;      public alphabetsimpleadapter(context context,             list<? extends map<string, ?>> 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];         ( int = 0; < to.length; ++)         {             mto[i] = to[i];         }         charlist = new hashmap<string, integer>();         int size = data.size();         tfsansmedium = typeface.createfromasset(context.getassets(), "fonts/vitessesans-medium.otf");         for(int = 0; < 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 avoid duplicates             }         }          set<string> sectionletters = charlist.keyset(); // set of first letters          arraylist<string> sectionlist = new arraylist<string>(sectionletters); // creating arraylist able sort elements         collections.sort(sectionlist, collator.getinstance(new locale("pl", "pl"))); // sorting elements         alphabet = new string[sectionlist.size()];         sectionlist.toarray(alphabet);      }      // methods required 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);         }         (int = 0; < mto.length; ++) {             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 > 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;     } }

charlist hashmap store letters last appearing index when have 6 elements starting letter "a", value key "a" 5 , on.

alphabet string array existing first letters.

i facing same problem. gave minimum sdk version 8 , traget 16 , wrote code below. , worked fine. 

             int currentapiversion = android.os.build.version.sdk_int;                  if (currentapiversion <= android.os.build.version_codes.froyo){                      // froyo , above versions                      fblist.setfastscrollenabled(true);                    } else if(currentapiversion > android.os.build.version_codes.honeycomb){                      // phones running sdk before froyo                      fblist.setfastscrollenabled(true);                      fblist.setfastscrollalwaysvisible(true);                  }

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