How to get contacts and phone numbers from the Android system

The contact database of the Android system is very complex, not a simple table can be done.

To simply query the user name and phone number, first to query the name, and then enter the name of the phone number, a name may correspond to multiple phone numbers:

    These is the Contacts rows that we'll retrieve. Static final string[] Contacts_summary_projection = new string[]{contactscontract.contacts._id, Con TactsContract.Contacts.DISPLAY_NAME, ContactsContract.Contacts.CONTACT_STATUS, Contactscontract.cont Acts. Contact_presence, ContactsContract.Contacts.PHOTO_ID, ContactsContract.Contacts.LOOKUP_KEY,} Uri BAS        Euri = ContactsContract.Contacts.CONTENT_URI;        Now create and return a cursorloader that would take care of//creating a Cursor for the data being displayed. String select = "((" + ContactsContract.Contacts.DISPLAY_NAME + "notnull) and (" + contactscontract .        Contacts.has_phone_number + "=1" and ("+ ContactsContract.Contacts.DISPLAY_NAME +"! = "))";  return new Cursorloader (ContactActivity.this.getApplicationContext (), BaseUri, Contacts_summary_projection, Select, NULL, COntactsContract.Contacts.DISPLAY_NAME + "COLLATE localized ASC");        list<map<string, string>> list = new arraylist<> ();            while (Data.movetonext ()) {map<string, string> Map = new HashMap ();            String name = data.getstring (Data.getcolumnindex (ContactsContract.Contacts.DISPLAY_NAME));            String ContactId = data.getstring (Data.getcolumnindex (contactscontract.contacts._id));                    Cursor phone = getcontentresolver (). Query (ContactsContract.CommonDataKinds.Phone.CONTENT_URI,                    NULL, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + ContactId,            NULL, NULL); while (Phone.movetonext ()) {String number = phone.getstring (Phone.getcolumnindex (Contactscontract.commonda                TaKinds.Phone.NUMBER));                if (number! = null) {map.put (name, number); }} list.Add (map); }

　　

How to get contacts and phone numbers from the Android system