life02

http://zymic.iteye.com/blog/737643android中ContactsContract獲取聯系人的方法
從Android 2.0 SDK開始有關聯系人provider的類變成了ContactsContract，雖然老的android.provider.Contacts能用，但是在SDK中標記為為deprecated將被放棄不推薦的方法，而從Android 2.0及API Level為5開始新增了android.provider.ContactsContract來代替原來的方法。

ContactsContract的子類ContactsContract.Contacts是一張表，代表了所有聯系人的統計信息。比如聯系人ID(—ID),查詢鍵（LOOKUP_KEY）,聯系人的姓名(DISPLAY_NAME_PRIMARY),頭像的id(PHOTO_ID)以及群組的id等等。

我們可以通過以下的方法取得所有聯系人的表的Cursor對象：

1）ContentResolver contentResolver=getContentResolver();//獲取 ContentResolver對象查詢在ContentProvider里定義的共享對象；

2）Cursor cursor=contentResolver.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null)；//根據URI對象ContactsContract.Contacts.CONTENT_URI查詢所有聯系人；

從Cursor對象里我們關鍵是要取得聯系人的_id。通過它，再通過ContactsContract.CommonDataKinds的各個子類查詢該_id聯系人的電話（ContactsContract.CommonDataKinds.Phone）,email(ContactsContract.CommonDataKinds.Email)等等。

以取得該聯系人所有電話為例：

1）int idFieldIndex=cursor.getColumnIndex(ContactsContract.Contacts._ID);

             int id=cursor.getInt(idFieldIndex);//根據列名取得該聯系人的id；

2）Cursor phonecursor=contentResolver.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID+"=?", new String[]{Integer.toString(id)}, null);//再類ContactsContract.CommonDataKinds.Phone中根據查詢相應id聯系人的所有電話；

類似地可以ContactsContract.CommonDataKinds的不同的子類查詢不同的內容。android文檔告訴我們推薦使用ContactsContract.Contacts.LOOKUP_KEY代替ContactsContract.Contacts._ID。

最后，由于讀取聯系人比較的占用資源，為了提高用戶的體驗度?？紤]將讀取的過程放在線程里完成，推薦使用AsyncTask類。

 1package jtapp.contacts;
 2
 3import java.util.ArrayList;
 4import java.util.HashMap;
 5import java.util.List;
 6
 7import android.app.ListActivity;
 8import android.database.Cursor;
 9import android.os.Bundle;
10import android.provider.ContactsContract;
11import android.widget.SimpleAdapter;
12
13public class ViewContacts extends ListActivity {
14    /** *//** Called when the activity is first created. */
15    @Override
16    public void onCreate(Bundle savedInstanceState) {
17        super.onCreate(savedInstanceState);
18        setContentView(R.layout.main);
19        
20        List<HashMap<String, String>> items = fillMaps();        
21        SimpleAdapter adapter = new SimpleAdapter(
22                        this,items,R.layout.list_item,
23                        new String[]{"name","key"}, 
24                        new int[]{R.id.item,R.id.item2});
25        this.setListAdapter(adapter);
26
27    }
28
29        private List<HashMap<String, String>> fillMaps() {
30                List<HashMap<String, String>> items = new ArrayList<HashMap<String, String>>();
31
32                Cursor cur = null;
33                try {
34                        // Query using ContentResolver.query or Activity.managedQuery
35                        cur = getContentResolver().query(
36                                        ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
37                        if (cur.moveToFirst()) {
38                                int idColumn = cur.getColumnIndex(
39                                                ContactsContract.Contacts._ID);
40                        int displayNameColumn = cur.getColumnIndex(
41                                        ContactsContract.Contacts.DISPLAY_NAME);
42                                // Iterate all users
43                        do {
44                                        String contactId;
45                                        String displayName;
46                                        String phoneNumber = "";
47                                        // Get the field values
48                                        contactId = cur.getString(idColumn);
49                                        displayName = cur.getString(displayNameColumn);
50                                        // Get number of user's phoneNumbers
51                                        int numberCount = cur.getInt(cur.getColumnIndex(
52                                                        ContactsContract.Contacts.HAS_PHONE_NUMBER));
53                                        if (numberCount>0) {
54                                                Cursor phones = getContentResolver().query(
55                                                                ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
56                                                                null,
57                                                                ContactsContract.CommonDataKinds.Phone.CONTACT_ID 
58                                                                + " = " + contactId 
59                                                                /**//*+ " and " + ContactsContract.CommonDataKinds.Phone.TYPE 
60                                                                + "=" + ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE*/,
61                                                                null, null);
62                                                if (phones.moveToFirst()) {
63                                                        int numberColumn = phones.getColumnIndex(
64                                                                        ContactsContract.CommonDataKinds.Phone.NUMBER);
65                                                        // Iterate all numbers
66                                                        do {
67                                                                phoneNumber += phones.getString(numberColumn) + ",";
68                                                        } while (phones.moveToNext());
69                                                } 
70                                        }
71                                        // Add values to items
72                                        HashMap<String, String> i = new HashMap<String, String>();
73                                        i.put("name", displayName);
74                                        i.put("key", phoneNumber);
75                                        items.add(i);
76                                } while (cur.moveToNext());
77                        } else {
78                                HashMap<String, String> i = new HashMap<String, String>();
79                                i.put("name", "Your Phone");
80                                i.put("key", "Have No Contacts.");
81                                items.add(i);
82                        }
83                } finally {
84                        if (cur != null)
85                                cur.close();
86                }
87                return items;
88        }
89}