我正在为我的voicebot android应用程序使用dialogflow。
该应用程序在调试模式下运行正常，但在安装release apk dialogflow时出现错误：
不可用：凭据无法获取元数据
要生成sessionclient：

try {
            InputStream stream = context.getResources().openRawResource(R.raw.poc_9c75a7f4);
            GoogleCredentials credentials = GoogleCredentials.fromStream(stream);
            projectId = ((ServiceAccountCredentials) credentials).getProjectId();
            SessionsSettings.Builder settingsBuilder = SessionsSettings.newBuilder();
            SessionsSettings sessionsSettings = settingsBuilder.setCredentialsProvider(FixedCredentialsProvider.create(credentials)).build();
            sessionsClient = SessionsClient.create(sessionsSettings);
        } catch (Exception e) {
            Print.printStackTrace(e);
        }

向dialogflow发送请求：

try {
            DetectIntentRequest intentRequest = DetectIntentRequest.newBuilder()
                    .setSession(session.toString())
                    .setQueryInput(queryInput)
                    .build();
            DetectIntentResponse detectIntentResponse = sessionsClient.detectIntent(intentRequest);
            String botResponse = detectIntentResponse.getQueryResult().getFulfillmentText();
            dialogflowCallback.updateUI(botResponse);
        } catch (Exception e) {
            Print.printStackTrace(e);
        }

请帮我解决这个问题。