Android應用程序在關閉時未收到FCM通知

Question

我正在檢查Firebase Cloud Messaging以發送通知。當應用程序處於打開狀態時，它已經實現它並接收通知。但是，如果我關閉應用程序，它不再發出通知。有沒有解決方案。

代碼：

WebRequest wRequest; 
wRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send"); 
wRequest.Method = "post"; 
wRequest.ContentType = " application/json;charset=UTF-8"; 
wRequest.Headers.Add(string.Format("Authorization: key={0}", AppId)); 

wRequest.Headers.Add(string.Format("Sender: id={0}", SenderId)); 

string postData = "{\"registration_ids\":[\"" + regIds + "\"], \"data\": "+ value +"}"; 

Byte[] bytes = Encoding.UTF8.GetBytes(postData); 
wRequest.ContentLength = bytes.Length; 

Stream stream = wRequest.GetRequestStream(); 
stream.Write(bytes, 0, bytes.Length); 
stream.Close(); 

WebResponse wResponse = wRequest.GetResponse(); 

消息服務 -

public class MessagingService extends FirebaseMessagingService { 
    @Override 
    public void onMessageReceived(RemoteMessage remoteMessage) { 
     Map<String, String> data = remoteMessage.getData(); 
     sendNotification(data); 
    } 

    public void showMessage(Map<String, String> serverData) { 
     Intent i = new Intent(this,MainActivity.class); 
     i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 

     PendingIntent pendingIntent = PendingIntent.getActivity(this,0,i,PendingIntent.FLAG_UPDATE_CURRENT); 

     NotificationCompat.Builder builder = new NotificationCompat.Builder(this) 
       .setAutoCancel(true) 
       .setContentTitle(serverData.get("Title")) 
       .setContentText(serverData.get("Message")) 
       .setSmallIcon(R.drawable.common_google_signin_btn_icon_dark) 
       .setContentIntent(pendingIntent); 

     NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 

     manager.notify(Integer.parseInt(serverData.get("ItemId")),builder.build()); 
    } 

    private void sendNotification(Map<String, String> serverData) { 
     Intent intent = new Intent(this, MainActivity.class); 
     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
     PendingIntent pendingIntent = PendingIntent.getActivity(this,0 /* request code */, intent,PendingIntent.FLAG_UPDATE_CURRENT); 

     long[] pattern = {500,500,500,500,500}; 

     Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION); 

     NotificationCompat.Builder notificationBuilder = (NotificationCompat.Builder) new NotificationCompat.Builder(this) 
       .setSmallIcon(R.drawable.common_google_signin_btn_icon_dark) 
       .setContentTitle(serverData.get("Title")) 
       .setContentText(serverData.get("Message")) 
       .setAutoCancel(true) 
       .setVibrate(pattern) 
       .setLights(Color.BLUE,1,1) 
       .setSound(defaultSoundUri) 
       .setContentIntent(pendingIntent); 

     NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); 
     notificationManager.notify(Integer.parseInt(serverData.get("ItemId")), notificationBuilder.build()); 
    } 

} 

主要活動 -

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     FirebaseMessaging.getInstance().subscribeToTopic("test"); 
     FirebaseInstanceId.getInstance().getToken(); 
    } 
} 

Manifest-

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="test.com.firebasenotify"> 
    <uses-permission android:name="android.permission.INTERNET"/> 
    <uses-permission android:name="android.permission.READ_PHONE_STATE" /> 
    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <service android:name=".MessagingService"> 
      <intent-filter> 
       <action android:name="com.google.firebase.MESSAGING_EVENT" /> 
      </intent-filter> 
     </service> 
     <service android:name=".InstanceIDService"> 
      <intent-filter> 
       <action android:name="com.google.firebase.INSTANCE_ID_EVENT" /> 
      </intent-filter> 
     </service> 

    </application> 

</manifest> 

Answer 1

代碼沒有問題。我正在使用Mi note 4，並且在應用程序關閉時它不會在Mi4中顯示通知。我測試了與其他Android設備和它的工作正常。

感謝Tim Castelijns和Frank van Puffelen參與對話。

Answer 2

添加在POST有效載荷將解決這一參數的這個problem.The值必須是從0到2419200秒的持續時間time_to_live鍵，它對應於用於該FCM存儲並嘗試傳遞的最大時間週期消息。 「time_to_live」：3Refer Firebase Docs

Answer 3

作爲每FCM文檔onMessageReceived（）時的應用程序是在背景將不被調用。你應該在發送順序通知對象，以顯示它在系統托盤中，當用戶點擊它發射活動將開放數據處理爲額外與意圖。對於有效載荷，您應該使用數據對象。 see docs和Receive Messages in an Android App