无法在API 30中找到Content Provider [英] Failed to find Content Provider in API 30

问题描述

更新:由于我发现了与我的问题有关的更多详细信息，因此我必须完全更改我的问题.

UPDATE: I have to completely change my question since I found more details related to my problem.

问题:我的解析内容提供程序的应用程序无法在具有API 30的模拟器中运行.错误:

The problem: My app that resolves Content Provider doesn't work in Emulator with API 30. The error:

java.lang.SecurityException: Failed to find provider com.a52.datafeeder01.MyProvider for user 0; expected to find a valid ContentProvider for this authority

如果我使用API​​ 26、27、28和29，那么没问题.

If I use APIs 26,27,28 and 29 then there is no problem.

带有ContentProvider的应用中的AndroidManifest.xml:

AndroidManifest.xml in app with ContentProvider:

<manifest>
    <permission
        android:name="MyProvider._READ_PERMISSION"
        android:protectionLevel="normal" />
    <application>
        <activity>
        ...
        </activity>
        <provider android:name=".MyProvider"
            android:authorities="com.a52.datafeeder01.MyProvider"
            android:enabled="true"
            android:exported="true"
            android:readPermission="MyProvider._READ_PERMISSION"/>
    </application>
</manifest>

客户端应用中的AndroidManifest.xml:

AndroidManifest.xml in client app :

<manifest>
...
    <uses-permission android:name="MyProvider._READ_PERMISSION" />
...
</manifest>

如果我尝试在同一应用程序中解析Content Provider，则可以使用.

If I try to resolve Content Provider in the same app, it works.

如果我在客户端代码中使用 packageManager.getInstalledPackages(PackageManager.GET_PROVIDERS)来获取现有提供程序的列表，那么对于API [26,29]，我可以在列表中看到我的提供程序.如果我在API 30中运行此代码，则我的提供程序不在列表中.

If I use packageManager.getInstalledPackages(PackageManager.GET_PROVIDERS) in my client code to get list of existing providers then for APIs [26,29] I can see my provider in the list. If I run this code in API 30 my provider is not in the list.

似乎API 30中的某些内容与ContentProvider的注册有关.但是我找不到.

It seems that something was changed in API 30 related to registration of ContentProvider. However I can't find what.

推荐答案

我的自定义ContentProvider无法在具有API 30的模拟器上运行的原因是

The reason my custom ContentProvider doesn't work on Emulator with API 30 is Package visibility in Android 11+

要解决，我已在客户端的AndroidManifest.xml中添加以下< queries> 元素:

To Fix my issue I've added following <queries> element into client's AndroidManifest.xml:

<manifest>
...
    <queries>
        <package android:name="com.a52.datafeeder01" />
    </queries>
...
</manifest>

其中 com.a52.datafeeder01 是定义自定义ContentProvider的程序包名称.

where com.a52.datafeeder01 is the package name where custom ContentProvider is defined.

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