当应用程序处于前台时，FCM推送通知不会出现 - 本机反应

在Android上的本机应用程序中，当我在调试模式，前台和后台运行我的应用程序时，一切都工作正常，两个推送通知都没有任何错误 . 但是当我生成签名的APK文件时，只有后台推送接收并且前台推送没有收到 .

我检查了android调试（Logcat），我可以看到通知从Firebase收到罚款，而不是在前台显示 .

这是我的app.js代码，这段代码正常运行 .

// Firebase Cloud Messages Start
async componentDidMount() {
const notificationOpen: NotificationOpen = await firebase
    .notifications()
    .getInitialNotification();
if (notificationOpen) {
    const action = notificationOpen.action;
    const notification: Notification = notificationOpen.notification;
    var seen = [];
    alert(
        JSON.stringify(notification.data, function(key, val) {
            if (val != null && typeof val == "object") {
                if (seen.indexOf(val) >= 0) {
                    return;
                }
                seen.push(val);
            }
            return val;
        })
    );
}
const channel = new firebase.notifications.Android.Channel(
    "test-channel",
    "Test Channel",
    firebase.notifications.Android.Importance.Max
).setDescription("My apps test channel");
// Create the channel
firebase.notifications().android.createChannel(channel);
this.notificationDisplayedListener = firebase
    .notifications()
    .onNotificationDisplayed((notification: Notification) => {
        // Process your notification as required
        // ANDROID: Remote notifications do not contain the channel ID. You will have to specify this manually if you'd like to re-display the notification.
    });    this.notificationListener = firebase
    .notifications()
    .onNotification((notification: Notification) => {
        // Process your notification as required
        notification.android
            .setChannelId("test-channel")
            .android.setSmallIcon("ic_launcher");
        firebase.notifications().displayNotification(notification);
    });
this.notificationOpenedListener = firebase
    .notifications()
    .onNotificationOpened((notificationOpen: NotificationOpen) => {
        // Get the action triggered by the notification being opened
        const action = notificationOpen.action;
        // Get information about the notification that was opened
        const notification: Notification = notificationOpen.notification;
        var seen = [];
        alert(
            JSON.stringify(notification.data, function(key, val) {
                if (val != null && typeof val == "object") {
                    if (seen.indexOf(val) >= 0) {
                        return;
                    }
                    seen.push(val);
                }
                return val;
            })
        );
        firebase
            .notifications()
            .removeDeliveredNotification(notification.notificationId);
    });}
    componentWillUnmount() {
        this.notificationDisplayedListener();
        this.notificationListener();
        this.notificationOpenedListener();
    }
    // END

我也收到这两个错误：

Could not find class ‘android.app.NotificationChannelGroup’, referenced from method io.invertase.firebase.notifications.RNFirebaseNotificationManager.parseChannelGroupMap
Could not find class ‘android.app.NotificationChannel’, referenced from method io.invertase.firebase.notifications.RNFirebaseNotificationManager.parseChannelMap