Aynchronous task with file write

http://stackoverflow.com/questions/3028306/download-a-file-with-android-and-showing-the-progress-in-a-progressdialog

contact info
http://www.higherpass.com/Android/Tutorials/Working-With-Android-Contacts/1/

Send csv file email 

http://stackoverflow.com/questions/5401104/android-exporting-to-csv-and-sending-as-email-attachment

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