有关API以前的版本5，你必须使用联系人类和5起，你必须使用在 ContactsContract 类。

For API versions prior 5 you have to use the Contacts class and for 5 onwards you have to use the ContactsContract class.

您需要查询API的版本，并在那决定使用哪一个类。

You have to query the API version and upon that decide which class to use.