androidmediastorestorage-access-frameworkandroid-storage

MediaStore.getVolumeName(uri) - java.lang.IllegalArgumentException: Missing volume name

Using SAF I selected a folder for R/W media files.

For MediaStore.Audio.Media.getContentUri(volumeName) (29+ API) I need to specify a volume name (it can be a primary storage or external sd card) and then specify relative path using at:

val contentValues = ContentValues().apply {
    put(
        MediaStore.Audio.Media.RELATIVE_PATH,
        relativePath
    )
}

For example I have the following URIs (uriFolder):

so basically volume name can be "external_primary" (primary built-in storage) or "18F0-2D1C" (an external sd card)

I can just parse this string and get volume name:

a) if "primary" then it's going to be "external_primary" (we also have the following constant public static final String VOLUME_EXTERNAL_PRIMARY = "external_primary"; at MediaStore class)

b) if it's an external sd card then just get "18F0-2D1C" from string.

But there is also the following function: MediaStore.getVolumeName(uri) (29+ API)

I thought it would give me the same results instead of parsing the URI path string manually:

val volumeName = MediaStore.getVolumeName(uriFolder)

But I get the following exception:

java.lang.IllegalArgumentException: Missing volume name: content://com.android.externalstorage.documents/tree/primary%3AMUSIC

Though for relativePath I still need to parse URI path string manually to get "MUSIC" after %3A

So it's quite tricky to work with MediaStore and SAF together and fully stop using File classes

Solution

  • MediaStore.getVolumeName(uri) works only for uris you got from the media store.

    Such uries start with content://media/...

    MediaStore.getVolumeName(uri): external for: content://media/external/file/1000469026

    MediaStore.getVolumeName(uri): 28ef-1de5 for: content://media/28ef-1de5/file/391988