FileOutputStream os = null;
try {
  os = VCardTest.this.openFileOutput("Android.vcf", MODE_PRIVATE);
} catch (FileNotFoundException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
}
OutputStreamWriter writer;
try {
  writer = new OutputStreamWriter(os);
  VCardComposer composer = new VCardComposer();
  //create a contact
  ContactStruct contact1 = new ContactStruct();
  contact1.name = "Neo";
  contact1.company = "The Company";
  contact1.addPhone(Contacts.Phones.TYPE_MOBILE, "+123456789", null, true);
  //create vCard representation
  String vcardString;
  vcardString = composer.createVCard(contact1, VCardComposer.VERSION_VCARD30_INT);
  //write vCard to the output stream
  writer.write(vcardString);
  writer.write("/n"); //add empty lines between contacts
  // repeat for other contacts
  // ...
  writer.close();
} catch (UnsupportedEncodingException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
} catch (FileNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
} catch (VCardException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
} catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
}