CODEWITHSUNDEEP
androidcollections
User_B
User_B

Reputation: 17

How to sort HashMap<String,ArrayList> in Android?

How to sort HashMap<String,ArrrayList<String>>?

I am fetching contact name from phone contacts like:

"String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));"

And stored it into one HashMap<String,ArrayList<String>>. But all contacts I am getting in unsorted order.

May I know how to sort those contacts in alphabetical order so that I can display list view in sorted order?

Upvotes: 1

Views: 272

Answers (3)

virendrao
virendrao

Reputation: 1813

I used following code to get Contacts in Ascending Order of String names as follows:

public void getAllContacts(ContentResolver cr) {


        Cursor phones = cr.query(
                ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null,
                null, Phone.DISPLAY_NAME + " ASC");

        while (phones.moveToNext()) {
            String name = phones
                    .getString(phones
                            .getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String phoneNumber = phones
                    .getString(phones
                            .getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
            name1.add(name);
            phno1.add(phoneNumber);
        } 


        phones.close();
    }

Code for reference

Hope this is what you need.

Upvotes: 0

Pratik
Pratik

Reputation: 450

Use below class and pass List of data to the it. It will give you new sorted list.

public class CompareApp implements Comparator<AppDetails> {

private List<AppDetails> apps = new ArrayList<AppDetails>();

Context context;

public CompareApp(String str,List<AppDetails> apps, Context context) {
    this.apps = apps;
    this.context = context;

    Collections.sort(this.apps, this);
}

@Override
public int compare(AppDetails lhs, AppDetails rhs) {
    // TODO Auto-generated method stub
    return lhs.label.toUpperCase().compareTo(rhs.label.toUpperCase());
}

}

Upvotes: 1

Dario
Dario

Reputation: 2073

You can retrieve your data from the database already sorted. Just use

String orderBy =  ContactsContract.Contacts.DISPLAY_NAME + " DESC";

in your query. After that, usually when you need to use HashMap an have also sorted data, then you use HashMap + ArrayList. In HashMap you keep normal key,value pairs, in ArrayList you keep sorted values (in case if you have already sorted data, you add it to ArrayList while reading, you don't need to sort again).

If you need to sort ArrayList which is value in your HashMap, you can use:

Collections.sort(yourArrayList);

Upvotes: 1

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