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Android通过单个光标获取多个内容提供程序

[英]Android get multiple content Provider with single cursor

原文 2014-06-27 12:18:21 7 1 java/ android/ android-contentprovider/ android-cursor/ android-cursorloader

Hello Everyone , I am creating an application in which I have to deal with multiple content providers. 大家好，我正在创建一个必须与多个内容提供者打交道的应用程序。 To get every content I have to create a cursor. 要获取所有内容，我必须创建一个游标。 For example I create a cursor to get phone contacts and then create another to get call logs etc.I wonder is this necessary to create a new cursor every time to get a content.I want to know is there any way to get multiple contents with single cursor so that my code will be shorten. 例如，我创建一个游标以获取电话联系，然后创建另一个以获取通话记录等。我想知道是否有必要每次都创建一个新游标以获取内容。我想知道有什么方法可以用单光标，这样我的代码就会缩短。 Thanks in advance 提前致谢

1 个解决方案

It is not possible, and even if it was, that's not the way to go. 这是不可能的，即使是那样，这也不是可行的方法。 Imagine you got a Database with multiple tables: customers, sales, products; 假设您有一个包含多个表的数据库：客户，销售，产品； and each time you ask for customers, it brings you sales and products too. 每次您要客户时，也会带来销售和产品。 Not so efficient, right? 效率不高吧？

The correct way to go is use 1 Cursor for each data set you need. 正确的方法是为所需的每个数据集使用1个Cursor 。

PS: also always remember that shorter code != better. PS：还请记住，较短的代码！=更好。 Easy maintainable code == better. 易于维护的代码==更好。 That is called Scalability . 那就是可伸缩性 。 Read more here . 在这里阅读更多。