android - Use of TreeMap <Double, List<String>> -

i want sorted value based on key used treemap given sorted key want sorted key value according key. here key double , value array-list.

mainactivity.java

public void getexpandablelistdata() {         cursor cursor = databasehelper.getloadmoredata(count);         cursor.movetofirst();         string businessname;         string latitude;         string longitude;         string categorydescription;         double difference;         {             treemap<double, list<childinfo>> treemaplocationdifference;             treemaplocationdifference = new treemap<double, list<childinfo>>();             categorydescription = cursor.getstring(cursor                     .getcolumnindex("categorydesc"));             int categoryid = cursor.getint(cursor.getcolumnindex("categoryid"));             listdataheader.add(categorydescription);             list<childinfo> childlist = new arraylist<childinfo>();             cursor cursorchild = databasehelper.getchilddata(categoryid);             map.entry<double, list<childinfo>> entry;             list<childinfo> list = null;             cursorchild.movetofirst();             {                 businessname = cursorchild.getstring(cursorchild                         .getcolumnindex("businessname"));                 phonenumber = cursorchild.getstring(cursorchild                         .getcolumnindex("phone"));                 categorydescription = cursorchild.getstring(cursorchild                         .getcolumnindex("categorydesc"));                 latitude = cursorchild.getstring(cursorchild                 .getcolumnindex("latitude"));                 longitude = cursorchild.getstring(cursorchild                         .getcolumnindex("longitude"));                 childinfo childinfo = new childinfo(businessname, phonenumber,                         categorydescription, latitude, longitude);                 childlist.add(childinfo);                 currentlocation = new location("");                 currentlocation.setlatitude(18.5522);                 currentlocation.setlongitude(73.8956);                 location savedlocation = new location("databaselocation");                 savedlocation.setlatitude(double.parsedouble(latitude));                 savedlocation.setlongitude(double.parsedouble(longitude));                 difference = currentlocation.distanceto(savedlocation) * (0.001);                 treemaplocationdifference.put(difference, childlist);                 entry = treemaplocationdifference.entryset().iterator().next();                 list = new arraylist<childinfo>();                 list = entry.getvalue();                 listdatachild.put(categorydescription, list);             } while (cursorchild.movetonext());         } while (cursor.movetonext());         cursor.close();     }  

here used tree-map , want tree-map sorted key corresponding value assign value value of hash-map should sorted.