我正在尝试编写微型gmail客户端的android作为培训。我从https://developers.google.com/gmail/api/quickstart/android的gmail API指南样本修改了一点，以获得消息的标题和身体的线程。我设置范围为GmailScopes.Gmail_modify和编辑的主要请求函数如下：

private List<String> getDataFromApi() throws IOException {
            // Get the labels in the user's account.
            String user = "me";
            List<String> labels = new ArrayList<String>();
            ListLabelsResponse listResponse =
                    mService.users().labels().list(user).execute();
            ListThreadsResponse listThreads = null;
            try {
             listThreads = mService.users().threads().list(user).execute();
            } catch (IOException ioex){
                Log.e(LOG_TAG, "First: " + ioex.toString());
            }

            for (Thread thread : listThreads.getThreads()) {
                try {
                    thread = mService.users().threads().get(user, thread.getId()).setFormat("full").execute();
                } catch (IOException ioex){
                    Log.e(LOG_TAG, "Second: " + ioex.toString());
                }
                for(Message message : thread.getMessages()){
                    labels.add(message.getId());
                }

            }
            return labels;
        }

但我总是

Second: GoogleJsonResponseException: 403 Forbidden            {
                                                                             "code" : 403,
                                                                             "errors" : [ {
                                                                               "domain" : "global",
                                                                               "message" : "Metadata scope doesn't allow format FULL",
                                                                               "reason" : "forbidden"
                                                                             } ],
                                                                             "message" : "Metadata scope doesn't allow format FULL"
                                                                           }

我尝试了不同的作用域配置，但似乎服务作用域始终设置为GmailScopes.GMAIL_METADATA