How to avoid duplication while saving contact in android

Question

I want to add my contacts from listview to contact page in android.. I am able to add contacts. But how do I avoid duplicates?

For example: I have an entry with name Jony and number 123. If I press that same contact again it shouldn't be added to contact page. I dont want to add the contact if it is already in the contact page. How can I do this?

Here is my code:

import_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            ArrayList<HashMap<String, String>> newArrayList=null;

            //ArrayList<HashMap<String, String>> selectedContact=null;
            ArrayList<ContentProviderOperation> ops = new ArrayList<ContentProviderOperation>();

            newArrayList=ContactImportAdapter.contactsArrayList;

            for(int i=0;i<newArrayList.size();i++)
            {

                String name;
                String number;
                String mail;

            name=newArrayList.get(i).get("import_viewContactName");
            number=newArrayList.get(i).get("import_viewContactNumber");
            mail=newArrayList.get(i).get("import_viewContactMail");

            int rawContactInsertIndex = ops.size();

                ops.add(ContentProviderOperation.newInsert(RawContacts.CONTENT_URI)
                    .withValue(RawContacts.ACCOUNT_TYPE, null)
                        .withValue(RawContacts.ACCOUNT_NAME, null).build());

                ops.add(ContentProviderOperation
                        .newInsert(Data.CONTENT_URI)
                        .withValueBackReference(Data.RAW_CONTACT_ID,rawContactInsertIndex)
                        .withValue(Data.MIMETYPE, StructuredName.CONTENT_ITEM_TYPE)
                        .withValue(StructuredName.DISPLAY_NAME, name) // Name of the person
                        .build());                  


            ops.add(ContentProviderOperation
                        .newInsert(Data.CONTENT_URI)
                        .withValueBackReference(
                                ContactsContract.Data.RAW_CONTACT_ID,   rawContactInsertIndex)
                                .withValue(Data.MIMETYPE, Phone.CONTENT_ITEM_TYPE)
                                .withValue(Phone.NUMBER, number) // Number of the person
                                .withValue(Phone.TYPE, Phone.TYPE_MOBILE).build());


                ops.add(ContentProviderOperation.newInsert(ContactsContract.Data.CONTENT_URI)
                        .withValueBackReference(ContactsContract.Data.RAW_CONTACT_ID, rawContactInsertIndex)
                        .withValue(ContactsContract.Data.MIMETYPE,
                                ContactsContract.CommonDataKinds.Email.CONTENT_ITEM_TYPE)
                        .withValue(ContactsContract.CommonDataKinds.Email.DATA, mail)
                       .withValue(ContactsContract.CommonDataKinds.Email.TYPE, ContactsContract.CommonDataKinds.Email.TYPE_WORK)
                        .build());


    //Toast.makeText(getApplicationContext(), "Contact Added Successfully", Toast.LENGTH_SHORT).show();     
            }

            newArrayList.clear();
                try
                {
                    ContentProviderResult[] res = getContentResolver().applyBatch(ContactsContract.AUTHORITY, ops);
                }
                catch (RemoteException e)
                { 
                    // error
                }
                catch (OperationApplicationException e) 
                {
                    // error
                }   



        }
    });

Answer 1

Firstly To avoid duplicacy you will have to first call the database and check for the number if number exists then you can handle that.