Android experiment to show the mime-type of file directories
The app creates a directory in the getExternalFilesDir() and a corresponding uri for that directory.
Then the MIME type of the uri is checked, querying the underlying FileProvider.
Launch the app and see the result on the screen ...
... or run
./gradlew cAT
Some Apps would like to direct a user to a specific file directory. These apps should launch a ACTION_VIEW intent with
a data of a certain mime-type. However, there is no mime-type defined for file directories, see for example discussion at
https://stackoverflow.com/questions/18869772/mime-type-for-a-directory or
openintents/filemanager#87.
The suggested mime-type here is the one used by DocumentProviders.
It is defined at DocumentContracts.Document.MIME_TYPE_DIR
as
vnd.android.document/directory