Facebook SDK：SharePhotoContent不工作

Question

正在开发一个使用facebook sdk在一个帖子中共享文本和多个图像的应用程序。我使用了以下代码，但在我的fb wall帖子中没有任何反应。什么错误的代码请任何人帮助。提前谢谢。

private void publishImage() {

    ArrayList<SharePhoto> sharePhotos = new ArrayList<>();
    int imageFolderSize;
    File  imageFolder = new File(getActivity().getExternalCacheDir(), "attachments/images");
    if( imageFolder.exists()) {     
        imageFolderSize = imageFolder.listFiles().length;
        ArrayList<File> attachments = new ArrayList<>();
        if (imageFolder.exists()) {              
            Collections.addAll(attachments, imageFolder.listFiles());
        }

        if (imageFolderSize > 0) {
            for (int i = 0; i < attachments.size(); i++) {
                File file = attachments.get(i);
                if (file.exists()) {
                    if (file.getAbsolutePath().endsWith(".png")) {
                        try {
                            SharePhoto photo = new SharePhoto.Builder().setBitmap(BitmapFactory.decodeFile(file.getAbsolutePath()))
                                    .setCaption("Welcome To Facebook Photo Sharing on steroids!")
                                    .build();
                            sharePhotos.add(photo);
                        }catch (Exception e){
                            RMLog.debug("Execp: e"+e.toString());
                        }
                    }
                }                   
            }
        }
    }

SharePhotoContent scontent = new SharePhotoContent.Builder().addPhotos(sharePhotos
            ).build();
    if(ShareDialog.canShow(SharePhotoContent.class))
    {   ShareApi.share(scontent, null);          
        Toast.makeText(getActivity(), "Succsesfully posted on your wall",
        Toast.LENGTH_LONG).show();
    }  

}