Categories are now fully working.

src/com/studentersamfundet/app/DataHandler.java

@@ -1,10 +1,14 @@
 package com.studentersamfundet.app;
 
 import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+import java.util.TreeSet;
 
 public class DataHandler {
-	private LinkedList<Event> events = new LinkedList<Event>();
-
+	private List<Event> events = new LinkedList<Event>();
+	private Set<String> categories = new TreeSet<String>();
+	
 	public void insert(String id, String title, String description, String date, String location, String text, String category) {
 		int intId = Integer.parseInt(id);
 		if (get(intId) != null)
@@ -12,6 +16,7 @@ public class DataHandler {
 		
 		Event e = new Event(intId, title, description, date, location, text, category);
 		events.add(e);
+		categories.add(category);
 	}
 	
 	public Event get(int id) {
@@ -35,4 +40,8 @@ public class DataHandler {
 		}
 		return sorted.toArray(new Event[sorted.size()]);
     }
+	
+	public String[] getCategories() {
+		return categories.toArray(new String[categories.size()]);
+	}
 }