我剛剛使用主題消息傳遞實現了 firebase 云消息傳遞 pushNotification。收到通知，但 MyFirebaseMessagingService 未正常工作。它傳遞消息的方式與云消息傳遞相同。完成云消息功能。創建一個名為 MyFirebaseMessagingService 的服務并使用 FirebaseMessagingService 進行擴展。將服務添加到清單。這是我的 FirebaseMessagingService 類。@Overridepublic void onDeletedMessages() {    super.onDeletedMessages();}@Overridepublic void onMessageReceived(RemoteMessage remoteMessage) {    super.onMessageReceived(remoteMessage);    String messageTitle = remoteMessage.getNotification().getTitle();    String clickAction = remoteMessage.getNotification().getClickAction();    Uri soundUri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://"+ getApplicationContext().getPackageName() + "/" + R.raw.hollow);    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, getString(R.string.default_notification_channel_id))            .setSmallIcon(R.mipmap.ic_launcher_round)            .setContentTitle("New Notification")            .setSound(soundUri)            .setContentText(messageTitle);    Intent resultIntent = new Intent(clickAction);    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);    builder.setContentIntent(pendingIntent);    builder.setPriority(Notification.PRIORITY_HIGH);    if (Build.VERSION.SDK_INT >= 21) builder.setVibrate(new long[0]);    int mNotificationId = (int) System.currentTimeMillis();    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);    notificationManager.notify(mNotificationId, builder.build());}我的清單文件：-<service            android:name=".MyFirebaseMessagingService"            android:exported="true">            <intent-filter>            <action android:name="com.google.firebase.MESSAGING_EVENT"/>            </intent-filter>        </service>        <meta-data            android:name="com.google.firebase.messaging.default_notification_channel_id"            android:value="@string/default_notification_channel_id" />