CODEWITHSUNDEEP
androidandroid-listviewandroid-adapter
zngb
zngb

Reputation: 633

Android Sorting ListView

I have several ArrayLists that are going into the ListView adapter. What I'm trying to do is sort by just one of those ArrayLists...

    names = new ArrayList<String>();
    locations = new ArrayList<String>();
    timedates = new ArrayList<String>();

    //arraylists populated here

    adapter = new HomeAdapter(getActivity(), names, locations, timedates);
    setListAdapter(adapter);

How would I go about sorting the entire ListView by timedates for example?

Appreciate any help. Thanks!

Upvotes: 0

Views: 68

Answers (2)

Ashiq
Ashiq

Reputation: 140

You have to use a datamodel with only one ArryList. Details are given bellow:

arrayList= new ArrayList<DataModel>();

//arraylists populated here

adapter = new HomeAdapter(getActivity(), arrayList);
setListAdapter(adapter);

DataModel class will look like this:

public class DataModel {

    public String names;
    public String locations;
    public String timedates;

}

Finally sorting: 

Collections.sort(arrayList, new SortList());

public class SortList implements Comparator<DataModel> {
    public int compare(DataModel arg0, DataModel arg1) {
        int flag = arg0.timedates.compareTo(arg1.timedates);
        return flag;
    }
}

Edit 1:

To add data into the list:

DataModel dataModel = new DataModel();
dataModel.names = "Ashiq";
dataModel.locations = "Khulna, Bangladesh";
dataModel.timedates = System.currentTimeMillis(); 

arrayList.add(dataModel);

You don't have to use arraylist individually for each item. Just wrap all strings into dataModel and add it to the arraylist for adding each set of data.

Let me know if anything not seem to be clear.

Upvotes: 1

Pdksock
Pdksock

Reputation: 1030

Try this

Collections.sort(timedates,new Comparator<String>(){
    @Override
    public int compare(String s1, String s2){
        return s1.compareTo(s2);
    }
});
adapter.notifyDataSetChanged();

Upvotes: 0

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