Android : How to create VCF file from sim contacts in android

I did following code for creating VCF file for selected contacts for sim contacts.

 public void getVCF(ArrayList<String> ids, String path)
        {

            String[] strids = new String[ids.size()];
            strids = ids.toArray(strids);

            String cpath = path;

            for (int j = 0; j < strids.length; j++) {
                Cursor phones = getActivity().getContentResolver().query(
                        Uri.parse("content://icc/adn"), null,
                        ContactsContract.CommonDataKinds.Phone._ID+"=?", new String[]{strids[j]}, null);

                phones.moveToFirst();
                for (int i = 0; i < phones.getCount(); i++) {
                    String lookupKey = phones.getString(phones
                            .getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));
                    Uri uri = Uri.withAppendedPath(
                            ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);

                    AssetFileDescriptor fd;
                    try {
                        fd = getActivity().getContentResolver().openAssetFileDescriptor(uri, "r");
                        FileInputStream fis = fd.createInputStream();
                        byte[] buf = new byte[(int) fd.getDeclaredLength()];
                        fis.read(buf);
                        String VCard = new String(buf);

                        FileOutputStream mFileOutputStream = new FileOutputStream(
                                cpath, true);
                        mFileOutputStream.write(VCard.toString().getBytes());
                        phones.moveToNext();
                    } catch (Exception e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }

                }
            }
        }

but its not working. it throws below error:

08-12 12:01:26.866: E/AndroidRuntime(29797): java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.