Android 应用程序打开时未显示通知

应用程序运行时未显示通知。 它在应用程序关闭时工作

MyFirebaseMessagingService.java

    public class MyFirebaseMessagingService extends FirebaseMessagingService {
    private static final String TAG = MyFirebaseMessagingService.class.getSimpleName();

    private NotificationUtils notificationUtils;

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        Log.e(TAG, "From: " + remoteMessage.getFrom());

        if (remoteMessage == null)
            return;

        // Check if message contains a notification payload.
        if (remoteMessage.getNotification() != null) {
            Log.e(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
            handleNotification(remoteMessage.getNotification().getBody());
        }

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            Log.e(TAG, "Data Payload: " + remoteMessage.getData().toString());

            try {
                JSONObject json = new JSONObject(remoteMessage.getData().toString());
                handleDataMessage(json);
            } catch (Exception e) {
                Log.e(TAG, "Exception: " + e.getMessage());
            }
        }
    }

    /**
     * Called if InstanceID token is updated. This may occur if the security of
     * the previous token had been compromised. Note that this is called when the InstanceID token
     * is initially generated so this is where you would retrieve the token.
     */
    @Override
    public void onNewToken(String token) {
        Log.d(TAG, "Refreshed token: " + token);
        PrefManager.setStringPreferences ( Constants.REGID, token );
        // If you want to send messages to this application instance or
        // manage this apps subscriptions on the server side, send the
        // Instance ID token to your app server.
//        sendRegistrationToServer(token);
    }

    private void handleNotification(String message) {
        if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
            // app is in foreground, broadcast the push message
            Intent pushNotification = new Intent(Config.PUSH_NOTIFICATION);
            pushNotification.putExtra("message", message);
            LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);

            // play notification sound
            NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
            notificationUtils.playNotificationSound();
        }else{
            // If the app is in background, firebase itself handles the notification
        }
    }

    private void handleDataMessage(JSONObject json) {
        Log.e(TAG, "push json: " + json.toString());

        try {
            JSONObject data = json.getJSONObject("data");

            String title = data.getString("title");
            String message = data.getString("message");
            boolean isBackground = data.getBoolean("is_background");
            String imageUrl = data.getString("image");
            String timestamp = data.getString("timestamp");
            JSONObject payload = data.getJSONObject("payload");

            Log.e(TAG, "title: " + title);
            Log.e(TAG, "message: " + message);
            Log.e(TAG, "isBackground: " + isBackground);
            Log.e(TAG, "payload: " + payload.toString());
            Log.e(TAG, "imageUrl: " + imageUrl);
            Log.e(TAG, "timestamp: " + timestamp);


            if (!NotificationUtils.isAppIsInBackground(getApplicationContext())) {
                // app is in foreground, broadcast the push message
                Intent pushNotification = new Intent( Config.PUSH_NOTIFICATION);
                pushNotification.putExtra("message", message);
                LocalBroadcastManager.getInstance(this).sendBroadcast(pushNotification);

                // play notification sound
                NotificationUtils notificationUtils = new NotificationUtils(getApplicationContext());
                notificationUtils.playNotificationSound();

//                if (TextUtils.isEmpty(imageUrl)) {
//                    showNotificationMessage(getApplicationContext(), title, message, timestamp, pushNotification);
//                } else {
//                    // image is present, show notification with image
//                    showNotificationMessageWithBigImage(getApplicationContext(), title, message, timestamp, pushNotification, imageUrl);
//                }
            } else {
                // app is in background, show the notification in notification tray
                Intent resultIntent = new Intent(getApplicationContext(), HomeActivity.class);
                resultIntent.putExtra("message", message);

                // check for image attachment
                if (TextUtils.isEmpty(imageUrl)) {
                    showNotificationMessage(getApplicationContext(), title, message, timestamp, resultIntent);
                } else {
                    // image is present, show notification with image
                    showNotificationMessageWithBigImage(getApplicationContext(), title, message, timestamp, resultIntent, imageUrl);
                }
            }
        } catch (JSONException e) {
            Log.e(TAG, "Json Exception: " + e.getMessage());
        } catch (Exception e) {
            Log.e(TAG, "Exception: " + e.getMessage());
        }
    }


      //Showing notification with text only

    private void showNotificationMessage(Context context, String title, String message, String timeStamp, Intent intent) {
        notificationUtils = new NotificationUtils(context);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        notificationUtils.showNotificationMessage(title, message, timeStamp, intent);
    }


     //Showing notification with text and image

    private void showNotificationMessageWithBigImage(Context context,String title,String message,String timeStamp,Intent intent,String imageUrl) {
        notificationUtils = new NotificationUtils(context);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
        notificationUtils.showNotificationMessage(title, message, timeStamp, intent, imageUrl);
    }
}

在

handleDataMessage（）

中，当应用程序不在后台时，我将

showNotificationMessage（）的代码放入
。但是当我使用
showNotificationMessage（）
函数时，通知不会显示应用程序是后台还是前台

当我发表评论时，只在应用程序处于后台时才会显示函数通知

如何在应用程序处于前台时显示通知？
仅使用
数据
对象发送通知，而不使用
通知
如果您收到的通知处于终止状态，则您使用的是通知有效负载对象。在前台，您必须添加显示通知代码。您必须在通知中写入通知代码：

if (remoteMessage.getNotification() != null) {
            Log.e(TAG, "Notification Body: " + remoteMessage.getNotification().getBody());
            //Show Notfication
        }

有关更多详细信息，请查看官方链接。默认情况下，只有当应用程序不在前台时，才会显示通知

若要在应用程序位于前台时在任务栏中显示通知，请使用NotificationCompat.Builder添加自定义方法以显示通知

并在onMessageReceived中调用该方法，如

if (remoteMessage.getNotification() != null){
    Log.d(TAG, "Objects: " + remoteMessage.getNotification());
    generateNotification(getApplicationContext(),remoteMessage.getNotification().getBody());
}

这里有一个方法

private void generateNotification(Context context, String msg) {

        NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

        String channelId = "channel-fbase";
        String channelName = "demoFbase";
        int importance = NotificationManager.IMPORTANCE_HIGH;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel mChannel = new NotificationChannel(
                    channelId, channelName, importance);
            notificationManager.createNotificationChannel(mChannel);
        }

        Intent notificationIntent = new Intent(getApplicationContext(), AboutActivity.class);
        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, channelId);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            mBuilder.setSmallIcon(R.mipmap.ic_launcher);
            int color = 0x008000;
            mBuilder.setColor(color);
        } else {
            mBuilder.setSmallIcon(R.mipmap.ic_launcher);
        }
        mBuilder.setStyle(new NotificationCompat.BigTextStyle().bigText(msg));

        mBuilder.setContentTitle(msg);
        mBuilder.setContentText(msg);
        mBuilder.setContentIntent(pendingIntent);


        //If you don't want all notifications to overwrite add int m to unique value
        Random random = new Random();
        int m = random.nextInt(9999 - 1000) + 1000;
        mNotificationManager.notify(m, mBuilder.build());
    }