未通过FirebaseMessaging接收前台通知，但在后台工作

Question

我添加了一个FirebaseMessagingService类来接收前台通知。我没有收到前台通知。在后台，当应用程序最小化时，它运行良好。

我已经用firebase函数设置了后台通知，它工作得很好，现在我试图在前台获得这个通知，但通知没有出现。

我的FirebaseMessagingService类：

public class FirebaseMessaging extends FirebaseMessagingService {

@Override
public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
if (remoteMessage.getNotification() != null) {
String notification_title = remoteMessage.getNotification().getTitle();
String notification_message = remoteMessage.getNotification().getBody();
Notification.Builder mBuilder = new Notification.Builder(this)
.setContentTitle(notification_title)
.setContentText(notification_message)
.setSmallIcon(R.drawable.default_avatar);
int mNotificationId = (int) System.currentTimeMillis();
NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
}
}

无错误消息：

实际结果：通知永远不会出现在前台。预期结果：我想在im在应用程序中时收到通知，而不仅仅是在最小化时。

Answer 1

我将我的FirebaseMEssagingService类更改为它有效：

public class FirebaseMessaging extends FirebaseMessagingService {
private final String CHANNEL_ID = "personal_notifications";
@Override
public void onMessageReceived(@NonNull RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
String notification_title = remoteMessage.getNotification().getTitle();
String notification_message = remoteMessage.getNotification().getBody();
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = new NotificationChannel(CHANNEL_ID, "My Notifications", NotificationManager.IMPORTANCE_HIGH);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.default_avatar)
.setContentTitle(notification_title)
.setContentText(notification_message);
notificationManager.createNotificationChannel(notificationChannel);
int mNotificationId = (int) System.currentTimeMillis();
mNotifyMgr.notify(mNotificationId, mBuilder.build());
}
}

}