1.data表: 存放各种类型数据,如name,phone,email,在mimetypes表中确定数据类型;
2.raw_contacts表: 存放由data表多条数据关联一个联系人raw_contact_id;
3.contacts表: 大部分情况下raw_contacts表多条数据关联一个联系人contact_id;
4.mimetypes表: 联系人数据类型,例如name,phone,email..

搜了网上的获取所有联系人姓名和手号的代码,都是要连续查询两三个表,太繁琐了!
实际上使用android.provider.ContactsContract.CommonDataKinds.Phone.CONTENT_URI就可以了
因为Phone.CONTENT_URI就是系统APP的ContentProvider.java联合查询几个表(raw contact, contact, data)
无需再繁琐地去查询那几个表了,只需五行代码！
Cursor cur = getContentResolver().query(Phone.CONTENT_URI, null, null, null, null);
while (cur.moveToNext()) {
	String name = cur.getString(cur.getColumnIndex(Phone.DISPLAY_NAME));
	String number = cur.getString(cur.getColumnIndex(Phone.NUMBER));	
}
cur.close();

此外,通过手机号查找联系人,使用PhoneLookup.CONTENT_FIILTER_URI

在系统APP的SmsProvider.java
短信会话content://sms/conversations对应的SQL语句
	SELECT
		sms.body AS snippet,
		sms.thread_id AS thread_id,
		groups.msg_count AS msg_count,
		sms.date AS date,
		sms.address AS addr
	FROM  
		sms, (SELECT thread_id AS group_thread_id, MAX(date) AS group_date, 
		COUNT(*) AS msg_count FROM sms GROUP BY thread_id) AS groups
	WHERE
		sms.thread_id = groups.group_thread_id AND sms.date = groups.group_date
	ORDER BY date DESC

查询短信常用uri
短信详情uri: content://sms
短信会话uri: content://sms/conversations
Cursor cur = getContentResolver().query(uri, null, null, null, null);