android fcm通知未收到,而应接收通知的设备在Logcat中显示此消息(从FCM接收标题:空,从FCM正文接收:空)。我已经检查过在<26和>26 SDK版本中均未收到通知
====================MyFirebaseMessagingService===============================
public class MyFirebaseMessagingService extends FirebaseMessagingService {
private static final String channel_id = "the