IllegalArgumentException:无法在FileProvider.getUriForFile上找到包含xxx的配置根目录

问题描述

我一直在尝试关于共享文件的 Android教程.我这样设置FileProvider:

I have been trying to follow the Android tutorial on sharing files.I set up the FileProvider like this:

在主清单xml上:

<provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="com.example.mysecondapp.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true" >
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/filepaths" />
        </provider>

res/xml/filpaths.xml文件:

the res/xml/filpaths.xml file:

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="myexternalimages" path="SpCars_album/" />
</paths>

在我的代码中，我正在尝试以下操作:

And in my code I am trying the following:

File requestFile = new File(mImageFilenames[position]);
                try {
                    fileUri = FileProvider.getUriForFile(
                            SeventhActivity.this,
                            "com.example.mysecondapp.fileprovider",
                            requestFile);
                } catch (IllegalArgumentException e) {
                    Log.e("File Selector",
                            "The selected file can't be shared: " +
                                    mImageFilenames[position]);
                }

使用文件的正确工作路径实例化requestFile.该文件的路径完全以getExternalFilesDir(Environment.DIRECTORY_PICTURES)返回的内容开头.我只是不明白是什么引起了错误，因为一切似乎都合适.预先感谢.

The requestFile is instantiated with a proper working path for a file.The path of that file begins exactly with what getExternalFilesDir(Environment.DIRECTORY_PICTURES) returns.I just cant understand what raises the error because everything seems to fit.Thanks in advance.

推荐答案

AFAIK，不会为您提供名为SpCars_album/的目录.

AFAIK, that will not give you a directory named SpCars_album/.

您提供的文件不是FileProvider可以从已定义的根目录提供的文件.

The file you supplied is not one that can be served by the FileProvider from your defined roots.

更新

我忘记了这与 FileProvider 上的文档错误有关. FileProvider和<external-path>不会不提供getExternalFilesDir()中的文件，而不是Environment.getExternalStorageDirectory()中的文件.我创建了一个StreamProvider子类，该子类提供对getExternalFilesDir() 的支持.

I forgot that this is tied to a documentation bug on FileProvider. FileProvider and <external-path> does NOT serve files from getExternalFilesDir(), but instead from Environment.getExternalStorageDirectory(). I created a StreamProvider subclass that offers support for getExternalFilesDir().

如果您使用我的StreamProvider，将<external-path>替换为<external-files-path name="myexternalimages" path="Pictures/SpCars_album/" />，那么您的运气会更好.

If you use my StreamProvider, replacing your <external-path> with <external-files-path name="myexternalimages" path="Pictures/SpCars_album/" />, you should have better luck.

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