sort kalendar akademis -rifki&wisnu

sort kalendar akademis base on date

app/src/main/java/id/ac/ui/cs/myui/model/calendar/CalendarItem.java

 package id.ac.ui.cs.myui.model.calendar;
 
 
+import android.support.annotation.NonNull;
+
 import java.util.ArrayList;
 
 /**
@@ -9,7 +11,7 @@ import java.util.ArrayList;
  * modified by ghozi&emon on 16/8/17
  */
 
-public class CalendarItem{
+public class CalendarItem implements Comparable<CalendarItem>{
 
     private String start_date;
     private String end_date;
@@ -108,5 +110,21 @@ public class CalendarItem{
         result.add(year);
         return result;
     }
+    @Override
+    public int compareTo(@NonNull CalendarItem calendarItem) {
+        String[] thisStart = this.getStart_date().split("-");
+        String[] thatStart = calendarItem.getStart_date().split("-");
+        String a= thisStart[0]+thisStart[1]+thisStart[2];
+        String b= thatStart[0]+thatStart[1]+thatStart[2];
+        int diff = Integer.parseInt(a) - Integer.parseInt(b);
+        if(diff == 0){
+            String[] thisEnd = this.getEnd_date().split("-");
+            String[] thatEnd = calendarItem.getEnd_date().split("-");
+            String aa= thisEnd[0]+thisEnd[1]+thisEnd[2];
+            String bb= thatEnd[0]+thatEnd[1]+thatEnd[2];
+            diff = Integer.parseInt(aa)-Integer.parseInt(bb);
+        }
+        return diff;
+    }
 
 }