java.lang.IllegalArgumentException：无法找到包含/ storage / emulated / 0 / Pictures的已配置根目录

Question

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

按照此https://inthecheesefactory.com/blog/how-to-share-access-to-file-with-fileprovider-on-android-nougat/zh-CN教程，我已经设置了提供程序并提供了这样的路径：

表现

<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>

保存位图并获取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;
    }

撰写文件提供者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：无法找到包含/storage/emulated/0/Pictures/Polfaced/IMG_20170203_155130.jpg的已配置根目录

使用commonware的StreamProvider试过，但我认为图书馆有不同的目的（固定另一种类型的问题），试图保存文件，getFileDirs而不是Environment.getExternalStoragePublicDirectory但图像不会被保存，让similiar错误/

Answer 1

更改

<?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>

至

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

如您在上面共享的链接中所述。

以下提供者：

<?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>

将解决看起来像的路径

/storage/emulated/0/files/

但是您共享的路径

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

不包含以下内容或以以下内容开头：

/storage/emulated/0/files/

要了解什么

path="."

确实，请仔细阅读您共享的链接。