应用程序打开时不显示通知

问题描述 投票：0回答：6

应用程序运行时不显示通知。 当应用程序关闭时它会起作用。

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，我放置了
showNotificationMessage()
的代码。但是当我放置 
showNotificationMessage()
功能时，通知不会显示应用程序是后台还是前台。

当我评论说功能通知出现但仅当应用程序处于后台时。

如何在应用程序处于前台时显示通知？

android push-notification notifications foregroundnotification
6个回答
6
投票

默认情况下，仅当应用程序不在前台时才会显示通知。

如果您想在应用程序位于前台时在托盘中显示通知，请添加自定义方法以使用NotificationCompat.Builder显示通知

并像这样在 onMessageReceived 中调用该方法

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

方法在这里

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());
    }
1
投票

确保您已在 AndroidManifest.xml 中添加 Firebase 服务

<service
android:name=".MyFirebaseMessagingService"
        android:exported="false">
        <intent-filter>
            <action android:name="com.google.firebase.MESSAGING_EVENT" />
        </intent-filter>
    </service>
0
投票

仅使用 

Data
对象而不是 
Notification
发送通知。

0
投票

如果您在终止状态下收到通知，那么您正在使用通知有效负载对象。在前台，你必须添加显示通知的代码。您必须在通知中编写通知代码：

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

了解更多详情，请查看官方链接https://firebase.google.com/docs/cloud-messaging/android/receive

0
投票

就我而言（android 8.0 及更高版本），问题在于通知被发送到我未在应用程序中创建的通知通道。 通知有效负载如下所示：

const payload = {
    "token": deviceToken,
    "notification": {
      "title": senderFullName,
      "body": senderFullName + ": " + message
    },
    "data": {
      "senderId": senderId,
      "body": senderFullName + ": " + message,
      "type": "chatNotification"
    },
    "android": {
      "collapse_key": "chat_message_notification",
      "notification": {
        "channel_id": "chat_notifications_channel",
        "imageUrl": senderImageUrl
      }
    }

但是，我的应用程序代码没有创建相应的

chat_notifications_channel
，创建后一切都很好。

 private fun createChatNotificationChannel() {
        // Create the NotificationChannel, but only on API 26+ because
        // the NotificationChannel class is new and not in the support library
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val name = getString(R.string.direct_messages_notification_channel)
            val descriptionText = getString(R.string.chat)
            val importance = NotificationManager.IMPORTANCE_DEFAULT
            // This is the key line
            val channel =
                NotificationChannel("chat_notifications_channel", name, importance).apply {
                    description = descriptionText
                }
            // Register the channel with the system
            val notificationManager: NotificationManager =
                getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
            notificationManager.createNotificationChannel(channel)
        }
    }
0
投票

如果您已经设置了配置。不要忘记在 <service.. /> 部分添加 priority

，如下所示：


<service
    android:name="YOUR_CLASS">
    <intent-filter android:priority="1">
       ....
    </intent-filter>
</servive>


    

      

      
    

  

  

    
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