How to check which number is deleted from usercontact which has mutiple contact?

Question

I have added multiple number under different categories for single user like,

If I delete the one of the numbers , I want to detect which number got deleted from contact using ContactsContract content uris

Answer 1

ContactsContract API可以告诉您Contacts表（通过ContentObserver）中的某些已更改，但不是确切地说。

如果您想检测发生的更改，您需要保留并维护应用中所有联系人的缓存副本，您不需要实际数据本身，只需要每个数据的哈希值每个联系人的行。

然后，当您调用onChange时，您可以查看数据库中的所有数据行，并将它们与您上次找到的哈希值进行比较，并查看是否添加/修改/删除了任何数据行。 / p>