Android清单XML提供程序标签. android：authorities

概述当我在清单XML文件中遇到此标记时,我正在浏览android-17的NotePad示例应用程序：<providerandroid:name="NotePadProvider"android:authorities="com.google.provider.NotePad"android:exported="false"><grant-uri-permission

当我在清单XML文件中遇到此标记时,我正在浏览androID-17的NotePad示例应用程序：

    <provIDer androID:name="NotePadProvIDer"        androID:authoritIEs="com.Google.provIDer.NotePad"        androID:exported="false">        <grant-uri-permission androID:pathPattern=".*" />    </provIDer>

我查了一下单位名称,然后看到com.Google.provIDer.NotePad被列为提供商的授权之一.我假设NotePadProvIDer引用了NotePadProvIDer.java文件中定义的NotePadProvIDer类,但是我想问一问是否确实如此,以确保我走在正确的轨道上.

另外,我想知道com.Google.provIDer.NotePad到底是什么,它的定义是什么,以及com.Google.provIDer.NotePad的目的是什么,以及com.Google.provIDer.NotePad是该网站的授权机构.提供商.

解决方法:

那是ContentProvider.

Content provIDers are one of the primary building blocks of AndroID
applications, provIDing content to applications. They encapsulate data
and provIDe it to applications through the single ContentResolver
interface. A content provIDer is only required if you need to share
data between multiple applications. For example, the contacts data is
used by multiple applications and must be stored in a content
provIDer. If you don’t need to share data amongst multiple
applications you can use a database directly via sqliteDatabase.

实际上,com.Google.provIDer.NotePad是实现ContentProvIDer的类.

从<provider>开始：

androID:authoritIEs
A List of one or more URI authoritIEs that
IDentify data offered by the content provIDer. Multiple authoritIEs
are Listed by separating their names with a semicolon. To avoID
conflicts, authority names should use a Java-style naming convention
(such as com.example.provIDer.cartoonprovIDer). Typically, it’s the
name of the ContentProvIDer subclass that implements the provIDer

总结

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