java.lang.IllegalArgumentException : Failed to find configured root that contains/storage/emulated/0/Pictures 异常

Question

我正在尝试通过 intent for instagram 共享文件，但我意识到在 API 24++ 上，我不能在未经许可的情况下将 URI 共享给其他应用程序。

关注此https://inthecheesefactory.com/blog/how-to-share-access-to-file-with-fileprovider-on-android-nougat/en教程，我已经设置了提供者并提供这样的路径:

list

<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="myapplication.file_provider"
        android:exported="false"
        android:grantUriPermissions="true"
        tools:node="replace">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>

注意:有 `tools:node=replace"来覆盖库 RxPaparazzo 中的提供者。

provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path="files/"/>
</paths>

保存位图和获取uri的代码

public static Uri savePicture(Context context, Bitmap bitmap) {
        int cropHeight;
        if (bitmap.getHeight() > bitmap.getWidth()) cropHeight = bitmap.getWidth();
        else                                        cropHeight = bitmap.getHeight();

        bitmap = ThumbnailUtils.extractThumbnail(bitmap, cropHeight, cropHeight, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);

        File mediaStorageDir = new File(
                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                context.getString(R.string.app_name)
        );

        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                return null;
            }
        }

        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        File mediaFile = new File(
                mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg"
        );

        // Saving the bitmap
        try {
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);

            FileOutputStream stream = new FileOutputStream(mediaFile);
            stream.write(out.toByteArray());
            stream.close();

        } catch (IOException exception) {
            exception.printStackTrace();
        }

        // Mediascanner need to scan for the image saved
        Intent mediaScannerIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        Uri fileContentUri = Uri.fromFile(mediaFile);
        mediaScannerIntent.setData(fileContentUri);
        context.sendBroadcast(mediaScannerIntent);

        return fileContentUri;
    }

组成文件提供者 URI

Uri savedBitmap = ImageUtility.savePicture(getContext(), shareBitmap);
File media = new File(savedBitmap.getPath());
Uri contentUri = FileProvider.getUriForFile(getContext(), "myapplication.file_provider", media);

记录错误:

java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Pictures/Polfaced/IMG_20170203_155130.jpg

尝试使用 commonware 的 StreamProvider，但我认为该库有不同的用途(解决另一种类型的问题)，尝试将文件保存到 getFileDirs 而不是 Environment.getExternalStoragePublicDirectory 但图像未保存并出现类似错误/

Answer 1

改变

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path="files/"/>
</paths>

到

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path="."/>
</paths>

如您在上面分享的链接中所述。

下面的提供者:

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <external-path name="my_images" path="files/"/>
</paths>

将处理看起来像的路径

/storage/emulated/0/files/

但是你共享的路径

/storage/emulated/0/Pictures/Polfaced/IMG_20170203_155130.jpg

不包括或开头为:

/storage/emulated/0/files/

理解什么

path="."

确实如此，请详细阅读您分享的链接。