Android查询联系人信息的功能主要是实现查询联系人的姓名，电话，邮件地址，

String columns[] = new String[] { People._ID, People.NAME, 
People.NUMBER, People.PRIMARY_EMAIL_ID,   
People.PRIMARY_ORGANIZATION_ID, People.
PRIMARY_PHONE_ID, People.DISPLAY_NAME,   
People.IM_ACCOUNT, People.IM_HANDLE, People.PHONETIC_NAME, People.TYPE };  
Uri mContacts = People.CONTENT_URI;  
Cursor cur = managedQuery(mContacts, columns, // 要返回的数据字段  
null, // WHERE子句  
null, // WHERE 子句的参数  
People.NAME // Order-by子句  
);  
if (cur.moveToFirst()) {  
Cursor newcur = null;  
do {  
// 获取字段的值  
String name = cur.getString(cur.getColumnIndex(People.NAME));  
String phoneNo = cur.getString(cur.getColumnIndex(People.NUMBER));  
String peopleId = cur.getString(cur.getColumnIndex(People._ID));  
String[] PROJECTION = new String[] { Contacts.ContactMethods._ID, 
Contacts.ContactMethods.KIND, Contacts.ContactMethods.DATA };  
newcur = managedQuery(Contacts.ContactMethods.CONTENT_URI, 
PROJECTION, Contacts.ContactMethods.PERSON_ID + "=\'"  
+ cur.getLong(cur.getColumnIndex(People._ID)) + "\'", null, null);  
startManagingCursor(newcur);  
String email = "";  
if (newcur.moveToFirst()) {  
email = newcur.getString(newcur.getColumnIndex
(Contacts.ContactMethods.DATA));  
}  
log.info("name = " + name + " 
phoneNo = " + phoneNo + "email = " + email);  
if (email != null && !"".equals(email) && 
email.trim().length() != 0) {  
//此处可以取到联系人邮件  
}  
} while (cur.moveToNext());  
if (newcur != null) {  
newcur.close();//用完得关闭吧  
}  
}  
if (cur != null)  
cur.close(); //用完得关闭吧