下面是记事本示例代码，为什么android:authorities = com.google.provider.NotePad而不是使用项目包名称？到底是什么android:authorities要求？
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Declare the contents of this Android application. The namespace
attribute brings in the Android platform namespace, and the package
supplies a unique name for the application. When writing your
own application, the package name must be changed from "com.example.*"
to come from a domain that you own or have control over. -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.notepad" >
<uses-sdk android:minSdkVersion="11" />
<application android:icon="@drawable/app_notes"
android:label="@string/app_name"
>
<provider android:name="NotePadProvider"
android:authorities="com.google.provider.NotePad"
android:exported="false">
<grant-uri-permission android:pathPattern=".*" />
</provider>
<activity android:name="NotesList" android:label="@string/title_notes_list">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.EDIT" />
<action android:name="android.intent.action.PICK" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="vnd.android.cursor.dir/vnd.google.note" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.GET_CONTENT" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
</intent-filter>
</activity>
<activity android:name="NoteEditor"
android:theme="@android:style/Theme.Holo.Light"
android:screenOrientation="sensor"
android:configChanges="keyboardHidden|orientation"
>
<!-- This filter says that we can view or edit the data of
a single note -->
<intent-filter android:label="@string/resolve_edit">
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.EDIT" />
<action android:name="com.android.notepad.action.EDIT_NOTE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
</intent-filter>
<!-- This filter says that we can create a new note inside
of a directory of notes. The INSERT action creates an
empty note; the PASTE action initializes a new note from
the current contents of the clipboard. -->
<intent-filter>
<action android:name="android.intent.action.INSERT" />
<action android:name="android.intent.action.PASTE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="vnd.android.cursor.dir/vnd.google.note" />
</intent-filter>
</activity>
<activity android:name="TitleEditor"
android:label="@string/title_edit_title"
android:icon="@drawable/ic_menu_edit"
android:theme="@android:style/Theme.Holo.Dialog"
android:windowSoftInputMode="stateVisible">
<!-- This activity implements an alternative action that can be
performed on notes: editing their title. It can be used as
a default operation if the user invokes this action, and is
available as an alternative action for any note data. -->
<intent-filter android:label="@string/resolve_title">
<!-- This is the action we perform. It is a custom action we
define for our application, not a generic VIEW or EDIT
action since we are not a general note viewer/editor. -->
<action android:name="com.android.notepad.action.EDIT_TITLE" />
<!-- DEFAULT: execute if being directly invoked. -->
<category android:name="android.intent.category.DEFAULT" />
<!-- ALTERNATIVE: show as an alternative action when the user is
working with this type of data. -->
<category android:name="android.intent.category.ALTERNATIVE" />
<!-- SELECTED_ALTERNATIVE: show as an alternative action the user
can perform when selecting this type of data. -->
<category android:name="android.intent.category.SELECTED_ALTERNATIVE" />
<!-- This is the data type we operate on. -->
<data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
</intent-filter>
</activity>
<activity android:name="NotesLiveFolder" android:label="@string/live_folder_name"
android:icon="@drawable/live_folder_notes">
<intent-filter>
<action android:name="android.intent.action.CREATE_LIVE_FOLDER" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
为什么 android:authorities = com.google.provider.NotePad 而不是使用项目包名称？
我想是因为谷歌喜欢这样。它是一个提供商，来自 com.google。您的应用程序中还可以有多个提供程序，因此仅包名称可能还不够。
android:authorities 到底想要什么？
您的提供商的系统范围内的唯一标识符。或者更好的是全球独一无二。所有提供商都在系统中注册，并且它们必须是唯一的，否则无法安装想要使用相同名称的第二个应用程序。
您最终使用该字符串通过 Uri 与您的提供商进行通信，例如
Uri uri = Uri.parse("content://" + "your.authoritiy.string")
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