Using CursorLoader to get emails causes duplication of emails

Question

I am trying to get email ids of uses contacts. For that I am using Cursor Loader. There is one problem I am getting duplicate email ids also. How to remove email duplicacy. Shou

Answer 1

I used a small hack in my project - an SQL injection, like that:

@Override
public Loader onCreateLoader(int id, Bundle args) {
    return new CursorLoader(
            this,
            MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[] {
                "DISTINCT "+ MediaStore.Images.Media.BUCKET_ID,
                MediaStore.Images.Media.BUCKET_DISPLAY_NAME},
            null, null, null);
}

This code returns only bundle names and their IDs from Gallery. So, I'd rewrite your code like that:

@Override
public Loader onCreateLoader(int arg0, Bundle arg1) {
    String[] projection = new String[] {
        "DISTINCT " + ContactsContract.Contacts._ID,
        ContactsContract.Contacts.DISPLAY_NAME,
        ContactsContract.CommonDataKinds.Email.DATA};
    String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + "  COLLATE LOCALIZED ASC";
    String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP +"='1' AND " + Email.DATA +" IS NOT NULL AND " + Email.DATA +" != \"\" " ;

    //showing only visible contacts  
    String[] selectionArgs = null;
    return new CursorLoader(this, ContactsContract.CommonDataKinds.Email.CONTENT_URI, projection, selection, selectionArgs, sortOrder);
}