Firebase通知弹出时，应用程序出现故障

Question

当他们从朋友那里收到消息时，我正在尝试向设备发送通知。但是，如果他们将要收到弹出窗口，则该应用程序会在出现消息之前自动转到首页。我就是不明白。消息既是数据类型又是通知类型。我只是不知道错误是从哪里来的。请帮忙。下面是我的代码。

JS代码。

exports.sendNotification8 = functions.database.ref('/Users/{user_id}/Notifications/{notifications_id}')
    .onWrite((change,context) =>{

    var user_id = context.params.user_id;
    console.log(user_id);

    // Grab the current value of what was written to the Realtime Database.
    var eventSnapshot = change.after.val();

    var device_token = admin.database().ref('/Users/'+user_id+'/device_token').once('value');

    return device_token.then(result => {

    var token_id = result.val();

    console.log(token_id);

    var str = eventSnapshot.message;
    console.log(eventSnapshot.from);

    var payload = {
        notification: {
            title: eventSnapshot.from,
            body: str,
            click_action: "Chats",

        } ,
        data: {
            from_user_id: eventSnapshot.from_user_id,
            name: eventSnapshot.from,
            user_id: user_id
        }
    };

    // Send a message to devices subscribed to the provided topic.
    return admin.messaging().sendToDevice(token_id, payload).then(function (response) {
            // See the MessagingTopicResponse reference documentation for the
            // contents of response.
            console.log("Successfully sent message:", response);
            return;
        })
        .catch(function (error) {
            console.log("Error sending message:", error);
        });

    });

    });

我的onMessageReceived

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        super.onMessageReceived(remoteMessage);

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            String name = remoteMessage.getNotification().getBody();
            String title = remoteMessage.getNotification().getTitle();
            String click_action = remoteMessage.getNotification().getClickAction();
            String from_user_id = remoteMessage.getData().get("from_user_id");
            String texter_name = remoteMessage.getData().get("name");
            String user_id = remoteMessage.getData().get("user_id");

            showNotification(from_user_id, texter_name, user_id, name, title, click_action);

        }

        // Check if message contains a notification payload.
    }

    private void showNotification(String name, String title, String click_action, String from_user_id, String texter_name, String user_id) {

        String GROUP_KEY_WORK_EMAIL = "com.dreamlazerstudios.gtuconline";

        Intent resultIntent = new Intent(click_action);
        resultIntent.putExtra("from_user_id", from_user_id);
        resultIntent.putExtra("texter1", texter_name);
        resultIntent.putExtra("user_id", user_id);

        Intent intent;
        switch (click_action) {
            case "Download":
                intent = new Intent(this, Download.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "Download_Ent":
                intent = new Intent(this, DownloadEnt.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "InfoSys":
                intent = new Intent(this, MIS_Information.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "EntSystemsInfo":
                intent = new Intent(this, EntSystemsInfo.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "DatabaseInfo":
                intent = new Intent(this, DatabaseInfo.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "IntroToOil":
                intent = new Intent(this, DownloadIntro.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "IntroInfo":
                intent = new Intent(this, IntroToOilInfo.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "Student_SystemsDevt":
                intent = new Intent(this, student_mis.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            case "Chats":
                intent = new Intent(this, LoginActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
            default:
                intent = new Intent(this, LoginActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                break;
        }

        PendingIntent resultPendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.mipmap.ic_launcher)
                        .setContentTitle(title)
                        .setContentText(name)
                        .setAutoCancel(true)
                        .setGroup(GROUP_KEY_WORK_EMAIL)
                        .setSound(defaultSoundUri)
                        .setStyle(new NotificationCompat.BigTextStyle())
                        .setContentIntent(resultPendingIntent);

        int mNotificationId = (int) System.currentTimeMillis();

        NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

        mNotifyMgr.notify(mNotificationId, mBuilder.build());
    }
}