get my phone contacts android :-

Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
while (phones.moveToNext())
{
 String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
 String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
 txt.append(name+ " -"+phoneNumber);




}
phones.close();



nice link to create .csv file

http://stackoverflow.com/questions/4632501/android-generate-csv-file-from-table-values