@Override public @Nullable ParcelFileDescriptor openFile(@NonNull final Uri uri, @NonNull final String mode) throws FileNotFoundException {
		return forwardFd(() -> mResolver.openFileDescriptor(toTargetUri(uri), mode));
	}
This single-user provider serves as a proxy provider, since it can be accessed from any user.

Created by Oasis on 2017/8/29.
fileprovider/src/main/java/com/oasisfeng/island/fileprovider/ShuttleProvider.java