android에서 GCM ID가 생성되지 않음

Question

여기에서 고객 등록시 GCM ID를 생성해야합니다. 그러나 던지는 과실.

public void sendGCMKey() { 
     try { 
      FirebaseApp.initializeApp(this); 

      MyInstanceIDListenerService m = new MyInstanceIDListenerService(this, schoolId); 
      m.onTokenRefresh(); 
      SharedPreferenceSingleton.getInstance().writeStringPreference("isFCMTokenGenerated","YES"); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

이 서비스 클래스 코드

@Override 
    public void onTokenRefresh() { 
     // Get updated InstanceID token. 
     FirebaseApp.initializeApp(context);  // Newly added 20/9/2017 
     String refreshedToken = FirebaseInstanceId.getInstance().getToken(); 
     // TODO: Implement this method to send any registration to your app's servers. 
     sendRegistrationToServer(refreshedToken); 
    } 

    private void sendRegistrationToServer(String refreshedToken) { 
     Log.e("Refreshed Token ::",refreshedToken); 
     try { 
      SharedPreferenceSingleton.getInstance().init(context); 
      SharedPreferenceSingleton.getInstance().writeStringPreference(ApplicationConstants.GCM_ID_KEY, refreshedToken); 
      int appVersion = getAppVersion(context); 
      SharedPreferenceSingleton.getInstance().writeIntPreference(ApplicationConstants.GCM_VERSION_KEY, appVersion); 
      SharedPreferenceSingleton.getInstance().init(context); 
      String mobileNumber = SharedPreferenceSingleton.getInstance().getStringPreference(ApplicationConstants.MOBILE_KEY); 
      JSONObject jsonObject = new JSONObject(); 
      jsonObject.put(RegistrationContracts.MOBILE_KEY, mobileNumber); 
      jsonObject.put(RegistrationContracts.SCHOOL_ID_KEY, schoolId); 
      jsonObject.put(BroadcastContract.TYPE_KEY,BroadcastContract.TEACHER_TYPE_KEY_); 
      jsonObject.put(RegistrationContracts.GCM_KEY, refreshedToken); 
      AsyncWorkerEncrypted asyncGCMWorker = new AsyncWorkerEncrypted(context); 
      asyncGCMWorker.delegate = MyInstanceIDListenerService.this; 
      asyncGCMWorker.execute(ServerConnector.SEND_GCM_ID, jsonObject.toString(), RequestConstants.POST_REQUEST, RequestConstants.HEADER_YES, RequestConstants.GCM_SEND_ID); 

     } catch (Exception e){ 
      e.printStackTrace(); 
     } 

그것은 던지고있다 오류 :

가

java.lang.IllegalStateException: Default FirebaseApp is not initialized in this process com.xxx.cbcbc Make sure to call FirebaseApp.initializeApp(Context) first. 

사람이 문제를 알아내는 나를 도와 드릴까요?

Answer 1

나는 이것을 위해 많은 시간을 보냈다. 이 줄 Gradle을 (APP)에서 누락되고 .. 종속성 후 하단에 추가되어야

apply plugin: 'com.google.gms.google-services' 

그 무엇

https://developers.google.com/cloud-messaging/android/client