groups are always alphabetically sorted

src/de/tudarmstadt/informatik/hostage/ui2/fragment/RecordOverviewFragment.java

@@ -25,6 +25,8 @@ import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.HashMap;
 
@@ -208,6 +210,12 @@ public class RecordOverviewFragment extends Fragment implements ChecklistDialog.
 			items.add(item);
 		}
 
+        Collections.sort(groupTitle, new Comparator<String>() {
+            @Override
+            public int compare(String s1, String s2) {
+                return s1.compareToIgnoreCase(s2);
+            }
+        });
         RecordListAdapter adapter = new RecordListAdapter(this.getApplicationContext(), groupTitle, sectionData);
 
         mylist.setAdapter(adapter);