Fetching a large number of contacts

I'm trying to fetch all the Phone numbers and Emails in Android.by using this code.

enter code here 



            String KEY_NAME = "Name";

            String KEY_NO   = "No";



    String selection = ContactsContract.CommonDataKinds.Phone.IN_VISIBLE_GROUP + " = 1";

    String sortOrder = ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME + " COLLATE LOCALIZED ASC";





    String data="";

    String name="";

    ContactEntry contactObj;

    String id;



    List<String> temp = new ArrayList<String>();



    final String[] projection = new String[]{ContactsContract.Contacts._ID , ContactsContract.Contacts.DISPLAY_NAME , ContactsContract.Contacts.HAS_PHONE_NUMBER};



    final String[] email_projection = new String[] {ContactsContract.CommonDataKinds.Email.DATA , ContactsContract.CommonDataKinds.Email.TYPE};



    final String[] phone_projection = new String[] {ContactsContract.CommonDataKinds.Phone.NUMBER, ContactsContract.CommonDataKinds.Phone.TYPE};



    ContentResolver cr = context.getContentResolver();

    Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI , projection , selection , null , sortOrder);



    if(cur.getCount()>0){



        while(cur.moveToNext()){



             id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));

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



            if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {



                // get the phone number

                Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI , phone_projection , 

                                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",new String[]{id}, null);



                while (pCur.moveToNext()){



                         data =  pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));



                        if(!temp.contains(data) && !data.equals(null)){



                        }

                } 

                    pCur.close();

            }



           Cursor emailCur = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI, email_projection,

                                        ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?",  new String[]{id}, null); 



           while (emailCur.moveToNext()){ 





                data = emailCur.getString(emailCur.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));



                if(!temp.contains(data) && !data.equals(null)){             



                }

            } 

            emailCur.close();



        }



    }

This code is working fine. but for the large number number of contacts let's say 5000 contacts then it blocks the UI thread.how to create a ListAdapter for displaying all these contacts.If i fetch all the contacts in background user will see the empty list for a long time.please suggest some solution