FCM令牌不是在一些Android設備中生成的

Question

我在GCM中遇到問題，所以我遷移到FCM但我仍然收到與令牌相關的問題。

我推出了我的更新的應用程序，我檢查了300個新用戶， 其中200個獲取令牌，100個沒有獲取任何令牌，這是一個非常關鍵的問題。

空令牌的任何解決方案？

Answer 1

您在每次全新安裝時從MyInstanceIDListenerService類onTokenRefresh（）方法獲取FCM令牌。

或者你也可以得到FCM令牌這行代碼：

FirebaseInstanceId.getInstance().getToken(); 

Answer 2

 class MyFirebaseInstanceIdService extends FirebaseInstanceIdService { 

      private static final String TAG = "MyFirebaseIIDService"; 

      @Override 
      public void onTokenRefresh() { 

       //Getting registration token 
       String refreshedToken = FirebaseInstanceId.getInstance().getToken(); 

       //Displaying token in logcat 
       Log.e(TAG, "Refreshed token: " + refreshedToken); 

      } 

      private void sendRegistrationToServer(String token) { 
       //You can implement this method to store the token on your server 
       //Not required for current project 
      } 
     } 

    **Sometimes tokens are not generated then write this code** 

public class ContCreateTokenService extends Service { 
      @Nullable 
      @Override 
      public IBinder onBind(Intent intent) { 
       return null; 
      } 

      @Override 
      public int onStartCommand(Intent intent, int flags, int startId) { 
       Intent serviceIntent = new Intent(this, MyFirebaseMessagingService.class); 
       startService(serviceIntent); 
       return START_REDELIVER_INTENT; 
      } 
     } 

public class FetchNewRefreshToken extends IntentService { 
    /** 
    * Creates an IntentService. Invoked by your subclass's constructor. 
    * 
    * @param name Used to name the worker thread, important only for debugging. 
    */ 

    public static final String TAG = FetchNewRefreshToken.class.getSimpleName(); 


    public FetchNewRefreshToken() { 
     super(TAG); 
    } 

    @Override 
    protected void onHandleIntent(Intent intent) { 
     try { 

      // Resets Instance ID and revokes all tokens. 
      FirebaseInstanceId.getInstance().deleteInstanceId(); 


      // Now manually call onTokenRefresh() 
      Log.e(TAG, "Getting new token"); 
      FirebaseInstanceId.getInstance().getToken(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

而且它添加Menifest文件

<service android:name=".ContCreateTokenService" /> 
<service android:name=".FetchNewRefreshToken " /> 

在飛濺活動： -

startService(new Intent(this, FetchNewRefreshToken.class)); 
startService(new Intent(this, ContCreateTokenService.class));