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下面是记事本示例代码，为什么android:authorities = com.google.provider.NotePad不使用项目包名呢？到底android:authorities要什么？

     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>
4

2 回答 2

6

为什么使用 android:authorities = com.google.provider.NotePad 而不是使用项目包名？

我猜是因为谷歌喜欢这种方式。它是一个提供商，它来自 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 到底要求什么？

您的提供商的系统范围的唯一标识符。或者更好的全球独一无二。所有提供程序都已在系统中注册，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 与您的提供者进行通信，例如

Uri uri = Uri.parse("content://" + "your.authoritiy.string")
于 2012-11-23T22:49:39.677 回答
2

为什么 android:authorities = com.google.provider.NotePad 而不是使用项目包名？

因为那是代码作者决定输入的内容。只要它可能是唯一的，没关系。

话虽如此，使用您的应用程序包名称作为授权的一部分是一个好主意，只是为了帮助使其可能是唯一的。

android:authorities 到底要求什么？

它要求 . 支持的权限值ContentProvider。在一个Uri喜欢：

content://please.read.the.documentation/for/content/provider/1

权限是please.read.the.documentation。Android 将通过在设备上的元素中的属性注册的所有权限的名单中查找ContentProvider与此相关联的内容。您可以将其视为与主机在 HTTP URL 中所起的类似作用。Uriplease.read.the.documentationandroid:authorities<provider>

这是开始讨论权限的文档中的要点。ContentProvider

于 2012-11-23T22:45:43.883 回答