Allow user to switch between internal and external storage locations on Android

I am working on a project where I need to allow the user to read and write either from the external SD card or from the internal storage, but no matter what I try only one storage location is found.

I am using the Android emulator which has an android studio managed SD card and internal storage, which when loading solid explorer shows that they're available.

I am using the following code to get the storage locations:

File[] files = ContextCompat.getExternalFilesDirs(this, null);
        for (int i = 0; i < files.length; i++)
        {
            Log.d("BasePicker", "Name: " + files[i].getName() + " Path: " + files[i].getParentFile().getParentFile().getParentFile().getParentFile());
        }

The below outputs the following:

Name: files Path: /storage/emulated/0

I am doing getPatentFile() 4 times as I read that shows the root of each storage location, otherwise the path will be something like /storage/emulated/0/package_name/files

I then try and get the external storage location using the following:

Log.d("BasePicker", Environment.getExternalStorageDirectory().getPath());

but I am getting exactly the same storage path of `/storage/emulated/0'.

I've also tried the following:

Map<String, File> storageLocations = new HashMap<>(10);
        File sdCard = Environment.getExternalStorageDirectory();
        storageLocations.put(SD_CARD, sdCard);
        final String rawSecondaryStorage = System.getenv(ENV_SECONDARY_STORAGE);
        if (!TextUtils.isEmpty(rawSecondaryStorage)) {
            String[] externalCards = rawSecondaryStorage.split(":");
            for (int i = 0; i < externalCards.length; i++) {
                String path = externalCards[i];
                storageLocations.put(EXTERNAL_SD_CARD + String.format(i == 0 ? "" : "_%d", i), new File(path));
            }
        }

but this again only returns /storage/emulated/0

So the question is, how can I get the internal and external storage locations if they're available so that I can allow the user to select which storage location they want to use and they can browse and read/write to which ever storage location they want?

from Allow user to switch between internal and external storage locations on Android