How to Sort Date in descending order From Arraylist Date in android?

Question

I have an ArrayList which stores Dates and I sorted them in descending order. Now I want to display them in a ListView. This is what I did so far:

 spndata.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int position, long arg3) {

                switch (position) {
                case 0:
                    list = DBAdpter.requestUserData(assosiatetoken);
                    for (int i = 0; i < list.size(); i++) {
                        if (list.get(i).lastModifiedDate != null) {
                            lv.setAdapter(new MyListAdapter(
                                    getApplicationContext(), list));
                        }
                    }
                    break;
                case 1:
                    list = DBAdpter.requestUserData(assosiatetoken);

                    Calendar c = Calendar.getInstance();
                    SimpleDateFormat df3 = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");    
                    String formattedDate3 = df3.format(c.getTime());                        
                    Log.v("log_tag", "Date  " + formattedDate3);

                    for (int i = 0; i < list.size(); i++) {                         
                        if (list.get(i).submitDate != null) {                               
                            String sDate = list.get(i).submitDate;                              
                            SimpleDateFormat df4 = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");    
                            String formattedDate4 = df4.format(sDate);

                            Map<Date, Integer> dateMap = new TreeMap<Date, Integer>(new Comparator<Date>(){  
                                 public int compare(Date formattedDate3, Date formattedDate4) {
                                     return formattedDate3.compareTo(formattedDate4);
                                 }
                            });
                            lv.setAdapter(new MyListAdapter(
                                    getApplicationContext(), list));
                        }
                    }
                    break;
                case 2:

                    break;

                case 3:

                    break;

                default:
                    break;
                }

            }

            public void onNothingSelected(AdapterView<?> arg0) {
            }

        });

For new readers consider throwing away the long outmoded and notoriously troublesome SimpleDateFormat and friends, and adding ThreeTenABP to your Android project in order to use java.time, the modern Java date and time API. It is so much nicer to work with. — Anonymous
– Anonymous, Commented Nov 12, 2019 at 8:49

Sumit Singh · Accepted Answer · 2015-02-02 05:00:23Z

34

Create Arraylist<Date> of Date class. And use Collections.sort() for ascending order.

See sort(List<T> list)

Sorts the specified list into ascending order, according to the natural ordering of its elements.

For Sort it in descending order See Collections.reverseOrder()

Collections.sort(yourList, Collections.reverseOrder());

edited Feb 2, 2015 at 5:00

answered Oct 29, 2012 at 11:09

Sumit Singh

16k6 gold badges64 silver badges90 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jignesh Ansodariya · Accepted Answer · 2012-10-29 12:30:01Z

21

Just add like this in case 1: like this

 case 0:
     list = DBAdpter.requestUserData(assosiatetoken);
     Collections.sort(list, byDate);
     for (int i = 0; i < list.size(); i++) {
         if (list.get(i).lastModifiedDate != null) {
             lv.setAdapter(new MyListAdapter(
                     getApplicationContext(), list));
         }
     }
     break;

and put this method at end of the your class

static final Comparator<All_Request_data_dto> byDate = new Comparator<All_Request_data_dto>() {
    SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss a");

    public int compare(All_Request_data_dto ord1, All_Request_data_dto ord2) {
        Date d1 = null;
        Date d2 = null;
        try {
            d1 = sdf.parse(ord1.lastModifiedDate);
            d2 = sdf.parse(ord2.lastModifiedDate);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        return (d1.getTime() > d2.getTime() ? -1 : 1);     //descending
    //  return (d1.getTime() > d2.getTime() ? 1 : -1);     //ascending
    }
};

edited Oct 29, 2012 at 12:30

answered Oct 29, 2012 at 11:51

Jignesh Ansodariya

12.7k24 gold badges85 silver badges116 bronze badges

6 Comments

Jignesh Ansodariya Over a year ago

import these packages import java.util.Collections; import java.util.Date;

crickpatel0024 Over a year ago

The generic method sort(List<T>) of type Collections is not applicable for the arguments (ArrayList<All_Request_data_dto>).

crickpatel0024 Over a year ago

The inferred type All_Request_data_dto is not a valid substitute for the bounded parameter <T extends Comparable<? super T>>

Jignesh Ansodariya Over a year ago

please wait 1 min please put your DTO class here

crickpatel0024 Over a year ago

public class All_Request_data_dto { String requestId; String projectId; String tableId; String projectName; String displayId; String issueId; String title; String state; String lastModifiedDate; String lastModifier; String lastStateChanger; String owner; String submitDate; String submitter; String sort_submit_date; }

|

Stealth Rabbi · Accepted Answer · 2013-11-20 13:20:54Z

17

Date's compareTo() you're using will work for ascending order.

To do descending, just reverse the value of compareTo() coming out. You can use a single Comparator class that takes in a flag/enum in the constructor that identifies the sort order

public int compare(MyObject lhs, MyObject rhs) {

    if(SortDirection.Ascending == m_sortDirection) {
        return lhs.MyDateTime.compareTo(rhs.MyDateTime);
    }

    return rhs.MyDateTime.compareTo(lhs.MyDateTime);
}

You need to call Collections.sort() to actually sort the list.

As a side note, I'm not sure why you're defining your map inside your for loop. I'm not exactly sure what your code is trying to do, but I assume you want to populate the indexed values from your for loop in to the map.

edited Nov 20, 2013 at 13:20

answered Oct 29, 2012 at 11:06

Stealth Rabbi

10.4k27 gold badges109 silver badges187 bronze badges

2 Comments

ricvieira Over a year ago

The "!" way will not work, since compareTo returns an int, to reverse the value, either you change the order of the objects, or use: Collections.sort(list, Collections.reverseOrder(comparator));

Stealth Rabbi Over a year ago

@ricvieira excellent point! I have modified my answer to include reversing the order in the compare() method

Jomia · Accepted Answer · 2015-02-26 07:15:11Z

If date in string format convert it to date format for each object :

String argmodifiledDate = "2014-04-06 22:26:15";
SimpleDateFormat  format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
            try
            {
                this.modifiledDate = format.parse(argmodifiledDate);
            }
            catch (ParseException e)
            {

                e.printStackTrace();
            }

Then sort the arraylist in descending order :

ArrayList<Document> lstDocument= this.objDocument.getArlstDocuments();
        Collections.sort(lstDocument, new Comparator<Document>() {
              public int compare(Document o1, Document o2) {
                  if (o1.getModifiledDate() == null || o2.getModifiledDate() == null)
                    return 0;     
                  return o2.getModifiledDate().compareTo(o1.getModifiledDate());
              }
            });

Amit Deshpande · Accepted Answer · 2012-10-29 11:20:37Z

4

Date is Comparable so just create list of List<Date> and sort it using Collections.sort(). And use Collections.reverseOrder() to get comparator in reverse ordering.

From Java Doc

Returns a comparator that imposes the reverse ordering of the specified comparator. If the specified comparator is null, this method is equivalent to reverseOrder() (in other words, it returns a comparator that imposes the reverse of the natural ordering on a collection of objects that implement the Comparable interface).

edited Oct 29, 2012 at 11:20

answered Oct 29, 2012 at 11:07

Amit Deshpande

19.2k4 gold badges48 silver badges72 bronze badges

Comments

Deepak Kataria · Accepted Answer · 2019-11-11 07:20:36Z

Easier alternative to above answers

If Object(Model Class/POJO) contains the date in String datatype.

private void sortArray(ArrayList<myObject> arraylist) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"); //your own date format
if (reports != null) {
    Collections.sort(arraylist, new Comparator<myObject>() {
        @Override
        public int compare(myObject o1, myObject o2) {
            try {
                return simpleDateFormat.parse(o2.getCreated_at()).compareTo(simpleDateFormat.parse(o1.getCreated_at()));
            } catch (ParseException e) {
                e.printStackTrace();
                return 0;
            }
        }
    });
}

If Object(Model Class/POJO) contains date in Date datatype

private void sortArray(ArrayList<myObject> arrayList) {
if (arrayList != null) {
    Collections.sort(arrayList, new Comparator<myObject>() {
        @Override
        public int compare(myObject o1, myObject o2) {
            return o2.getCreated_at().compareTo(o1.getCreated_at()); }
    });
} }

The above code is for sorting the array in descending order of date, swap o1 and o2 for ascending order.

Collectives™ on Stack Overflow

How to Sort Date in descending order From Arraylist Date in android?

6 Answers 6

Comments

6 Comments

2 Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

6 Answers 6

Comments

6 Comments

2 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related