Android queries the contact name by phone number and exports all contacts in the address book

Android queries the contact name based on the phone number and exports all contacts in the address book. method 1 /*
2 * obtain the contact name based on the phone number
3 */
4 public static string getcontactnamebyphonenumber (context, string address ){
5 string [] projection = {contactscontract. phonelookup. display_name,
6 contactscontract. commondatakinds. Phone. Number };
7
8 // Add yourself to mspeers
9 cursor = context. getcontentresolver (). Query (
10 contactscontract. commondatakinds. Phone. content_uri,
11 projection, // which columns to return.
12 contactscontract. commondatakinds. Phone. Number + "= '"
13 + address + "'", // where clause.
14 null, // where clause value substitution
15 null); // sort order.
16
17 if (cursor = NULL ){
18 log. D (TAG, "getpeople null ");
19 return NULL;
20}
21 For (INT I = 0; I <cursor. getcount (); I ++ ){
22 cursor. movetoposition (I );
23
24 // get the contact name
25 int namefieldcolumnindex = cursor
26. getcolumnindex (contactscontract. phonelookup. display_name );
27 string name = cursor. getstring (namefieldcolumnindex );
28 return name;
29}
30 return NULL;
31}
32
33 /**
34 * retrieve all contacts
35 * @ Param Context
36 * @ Param address
37 * @ return
38 */
39 public static string getcontacts (context ){
40 stringbuilder sb = new stringbuilder ();
41
42 contentresolver Cr = context. getcontentresolver ();
43 cursor = Cr. Query (contactscontract. Contacts. content_uri, null,
44 null, null, null );
45
46 If (cursor. movetofirst ()){
47 do {
48 string contactid = cursor. getstring (cursor
49. getcolumnindex (contactscontract. Contacts. _ id ));
50 string name = cursor
51. getstring (cursor
52. getcolumnindex (contactscontract. Contacts. display_name ));
53 // line feed is not required for the first line
54 if (sb. Length () = 0 ){
55 sb. append (name );
56} else {
57 sb. append ("\ n" + name );
58}
59
60 cursor phones = Cr. Query (
61 contactscontract. commondatakinds. Phone. content_uri,
62 null, contactscontract. commondatakinds. Phone. contact_id
63 + "=" + contactid, null, null );
64 While (phones. movetonext ()){
65 string phonenumber = phones
66. getstring (Phones
67. getcolumnindex (contactscontract. commondatakinds. Phone. Number ));
68 // Add phone information
69 sb. append ("\ t"). append (phonenumber );
70
71}
72 phones. Close ();
73
74} while (cursor. movetonext ());
75}
76 cursor. Close ();
77 return sb. tostring ();

78}