alert dialog box list repeating items

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Mobile

Android

i have developed an application where i need to show an alert dialog box with list of item,though i have filtered the duplicate data but it is still repeating the items...i really don't have any idea why it is happening...can anybody please help!!

CODE FOR CREATING DIALOG BOX

final CharSequence[] strDates = objEventDataLoader.arrDatesString.toArray(new CharSequence[objEventDataLoader.arrDatesString.size()]);
		
		AlertDialog.Builder objBuilder = new AlertDialog.Builder(this.getActivity());
		objBuilder.setTitle("Pick Date");
		objBuilder.setItems(strDates,
				new DialogInterface.OnClickListener() {

					public void onClick(DialogInterface dialog,
							int Dates) {
						// TODO Auto-generated method stub
						Toast.makeText(getActivity(),
								strDates[Dates],
								Toast.LENGTH_SHORT).show();

					}
				});
		//objBuilder.setView(v);
		AlertDialog objAlert = objBuilder.create();
		objAlert.show();

CODE FOR GETTING ARRAYLIST

public class EventDataLoader {
	
	private static String strJSON;
	private JSONArray arrJSONEventsData;
	public ArrayList<hashmap><string,>> arrEventList = new ArrayList<hashmap><string,>>();	
	public ArrayList<string> arrDatesString = new ArrayList<string>();
	


	public EventDataLoader() {
		readTextFromSource();
	}

	private void onDataLoaded() {
		 
		try {
			
			arrJSONEventsData = new JSONArray(strJSON);
			
			int strCount = arrJSONEventsData.length();
			for (int i = 0; i < strCount; i++) {
				HashMap<string,> objEventsData = new HashMap<string,>();
				JSONObject e = arrJSONEventsData.getJSONObject(i);
				//objLinksData.put("linkURL", String.valueOf(i));
				//objLinksData.put("linkName", e.getString("linkName"));
				objEventsData.put("eventID", e.getString("eventID"));
				objEventsData.put("eventPreviousID", e.getString("eventPreviousID"));
				objEventsData.put("eventDate", e.getString("eventDate"));
				//objLinksData.put("linkID", e.getString("linkID"));
				arrEventList.add(objEventsData);
				arrDatesString.add(e.getString("eventDate"));
				
		
			}
			
			checkDataDuplicacy();
			
		} 
		catch (JSONException e) {
			Log.e("log_tag", "Error parsing data " + e.toString());
		}
	}

	private void readTextFromSource() {
		try {
			// Create a URL for the desired page
			URL url = new URL(" ") ;

			// Read all the text returned by the server
			BufferedReader in = new BufferedReader(new InputStreamReader(
					url.openStream()));
			String str;
			StringBuilder sb = new StringBuilder(100);
			while ((str = in.readLine()) != null) {
				sb.append(str);
				// str is one line of text; readLine() strips the newline
				// character(s)
			}
			in.close();
			strJSON = sb.toString();
			onDataLoaded();
		} catch (MalformedURLException e) {

		} catch (IOException e) {

		}
	}
	private void checkDataDuplicacy()
	{
		for (int i = 0; i < arrEventList.size(); i++) 
		{
			removeIfDuplicateAvailable(i);
		}
		
	}
	
	private void removeIfDuplicateAvailable(int nCount)
	{
		HashMap<string,> objEventsData = arrEventList.get(nCount);
		String strPrvsId = objEventsData.get("eventPreviousID");
		if(strPrvsId.equalsIgnoreCase("-1"))
		{
			
		}
		else
		{
			removeEventObjectWithPrvsId(strPrvsId);
		}
	}
	
	private void removeEventObjectWithPrvsId(String strPrvsId)
	{
		for (int i = 0; i < arrEventList.size(); i++) 
		{
			HashMap<string,> objEventsData = arrEventList.get(i);
			if(strPrvsId.equalsIgnoreCase(objEventsData.get("eventID")))
			{
				Log.i("development","Finally Removing");
				arrEventList.remove(i);
				arrDatesString.remove(i);
				Log.i("development",arrDatesString.get(i));
				return;
			}
		}
	}

}