Check if a Document Uri is of External SD Card Root

Question

How can we check whether the selected document using ACTION_OPEN_DOCUMENT_TREE is the external SD Card root or not?

Answer 1

Here're the functions I am using for determining if the Uri is of External SD Card and whether it's situated at the root of the SD card or not

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static boolean checkIfSDCardRoot(Uri uri) {
    return isExternalStorageDocument(uri) && isRootUri(uri) && !isInternalStorage(uri);
}

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private static boolean isRootUri(Uri uri) {
    String docId = DocumentsContract.getTreeDocumentId(uri);
    return docId.endsWith(":");
}

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public static boolean isInternalStorage(Uri uri) {
    return isExternalStorageDocument(uri) && DocumentsContract.getTreeDocumentId(uri).contains("primary");
}

public static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

These methods are taken from the library I have created for dealing with the Storage Access Framework. The library is open-sourced and present on Github - NoobFileChooser. The functions are present in this file.