从Android获取Blobstore上传url的语法是什么？

我已经为GWT上传了Blobstore，但现在我需要我的Android应用程序上传到Blobstore。我看到了这篇文章，它解释了我拥有URL后如何上传，但它没有显示获取URL：

我的问题是：

我应该将get发送到哪个URL

获取blobstore的语法是什么

谢谢

我有这样的：

Widget.presenter.java：

uploadButton.addClickHandler(new ClickHandler() {
 @Override
 public void onClick(ClickEvent event) {
 //init action
 imageService.getBlobStoreUploadUrl(new AsyncCallback<String>() {
      @Override
      public void onFailure(Throwable caught) {
        Window.alert("Oups Error at ImageUploaderPresenter");
      }
      @Override
      public void onSuccess(String result) {
        uploadForm.setActionUpload(result);
        uploadForm.submit();
      }
    }
  });
}

@Override
public String getBlobStoreUploadUrl() {
    //Map the UploadURL to the uploadservice which will be called by
    //submitting the FormPanel
    return blobstoreService.createUploadUrl("/imageUpload");
}