Change file permission setting Google Drive Android API

Question

I am creating an audio recorder which after completion of recording, automatically uploads recording to user's Google Drive and share its link with predefined set of contacts. I have been able to upload the file using Google Drive Android API. Now, I want to share uploaded file's link. I have been able to get uploaded file's drive id and resourceIdusing which I can get webContentLink of the file. However, this file by default has private access. How can I change this access to anyone with link programmatically using either Google Drive Android API or Google Drive REST API??

I have been trying to change permission settings using following code:

private void changePermissionSettings(String resourceId) throws GeneralSecurityException, IOException, URISyntaxException {

        com.google.api.services.drive.Drive driveService = getDriveService();

        JsonBatchCallback<com.google.api.services.drive.model.Permission> callback = new JsonBatchCallback<com.google.api.services.drive.model.Permission>() {
            @Override
            public void onFailure(GoogleJsonError e, HttpHeaders responseHeaders) throws IOException {

                Log.e("upload", "Permission Setting failed");
            }

            @Override
            public void onSuccess(com.google.api.services.drive.model.Permission permission, HttpHeaders responseHeaders) throws IOException {
                Log.e("upload", "Permission Setting success");

            }
        };

        BatchRequest batchRequest = driveService.batch();

        com.google.api.services.drive.model.Permission userPermission = new com.google.api.services.drive.model.Permission()
                .setType("user")
                .setRole("writer");

        driveService.permissions().create(resourceId, userPermission)
                .setFields("id")
                .queue(batchRequest, callback);

        com.google.api.services.drive.model.Permission contactPermission = new com.google.api.services.drive.model.Permission()
                .setType("anyone")
                .setRole("reader");
        driveService.permissions().create(resourceId, contactPermission)
                .setFields("id")
                .queue(batchRequest, callback);

        batchRequest.execute();
    }


    private com.google.api.services.drive.Drive getDriveService() throws GeneralSecurityException,
            IOException, URISyntaxException {

        Collection<String> elenco = new ArrayList<>();
        elenco.add("https://www.googleapis.com/auth/drive");

        GoogleAccountCredential credential = GoogleAccountCredential.usingOAuth2(this, elenco)
                .setSelectedAccountName(getAccountName());

        Log.e("upload", getAccountName());

        return new com.google.api.services.drive.Drive.Builder(
                AndroidHttp.newCompatibleTransport(), new JacksonFactory(), credential).build();
    }

But this code is not working. What am I doing wrong??