如何像 whatsapp 在 FirebaseMessagingService 中那样合并推送通知

Question

如何在 FirebaseMessagingService 中合并推送通知。我几乎尝试了一切，但似乎没有任何效果。对于每个新的数据对象，它都会发出一个新的通知。我打印通知数量的日志打印 0.

有什么方法可以跟踪通知抽屉中是否有任何具有相同 notificationId 的未读通知，以便我可以将新通知与其合并？

任何帮助将不胜感激。

public class MyFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "MyFirebaseMsgService";
    private static final String actionLiked = "liked";
mNumber=0;
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {

           ArrayList<String>notificationString= new ArrayList<>();


        Log.d(TAG, "From: " + remoteMessage.getFrom());

        // Check if message contains a data payload.
        if (remoteMessage.getData().size() > 0) {
            Log.d(TAG, "Message data payload: " + remoteMessage.getData());
            Log.d(TAG, "Number of notifications" +mNumber);

            Map<String, String> dataFromCloud =  remoteMessage.getData();
            String action = dataFromCloud.get("action");
            switch (action) {
                case actionLiked:
                notificationString.add(action);
                    Intent intent = new Intent(this, MainActivity.class);
                    sendNotification(action, intent);
                    break;
                default:
                    break;
            }
        }
    }

    private void sendNotification(String messageTitle, Intent intent) {

        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_ONE_SHOT);

                        String[] events = new String[6];


        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setAutoCancel(true)
                .setContentIntent(pendingIntent)
                .setNumber(++numMessages);

    NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();
      for (int i=0; i < notificationString.size(); i++) {
      inboxStyle.addLine(notificationString.get(i));
           }

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

        notificationManager.notify(0, notificationBuilder.build());
        }}

Answer 1

由于没有人回答这个问题，所以我自己想出了一个答案。这可能不是合并通知的最优化方式，但它对我来说就像一个魅力。看看 my blog post.

这是我的 FirebaseMessagingService class :

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    private static final String TAG = "MyFirebaseMsgService";
    private static final String actionLiked = "liked";
    private static final int NOTIFICATION_ID = 1593;
    private final String GROUP_KEY = "GROUP_KEY_RANDOM_NAME";
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        ArrayList<String> notificationString = new ArrayList<>();
        if (remoteMessage.getData().size() > 0) {
            Map<String, String> dataFromCloud = remoteMessage.getData();
            String action = dataFromCloud.get("action");
            String userName = dataFromCloud.get("userName");
            switch (action) {
                case actionLiked:
                    notificationString.add(action);
                    Intent intent = new Intent(this, LikeActivity.class);
                    String message = userName + " liked your photo.";
                    sendNotification(message, intent);
                    break;
                default:
                    break;
            }
        }
    }
    @TargetApi(Build.VERSION_CODES.M)
    private void sendNotification(String messageBody, Intent intent) {
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
        Intent onCancelNotificationReceiver = new Intent(this, CancelNotificationReceiver.class);
        PendingIntent onCancelNotificationReceiverPendingIntent = PendingIntent.getBroadcast(this.getApplicationContext(), 0,
                onCancelNotificationReceiver, 0);
        String notificationHeader = this.getResources().getString(R.string.app_name);
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        StatusBarNotification[] notifications = manager.getActiveNotifications();
        for (int i = 0; i < notifications.length; i++) {
            if (notifications[i].getPackageName().equals(getApplicationContext().getPackageName())) {
                Log.d("Notification", notifications[i].toString());
                Intent startNotificationActivity = new Intent(this, NotificationCenterActivity.class);
                startNotificationActivity.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, startNotificationActivity,
                        PendingIntent.FLAG_ONE_SHOT);
                Notification notification = new NotificationCompat.Builder(this)
                        .setSmallIcon(R.mipmap.ic_launcher)
                        .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                        .setContentTitle(notificationHeader)
                        .setContentText("Tap to open")
                        .setAutoCancel(true)
                        .setStyle(getStyleForNotification(messageBody))
                        .setGroupSummary(true)
                        .setGroup(GROUP_KEY)
                        .setContentIntent(pendingIntent)
                        .setDeleteIntent(onCancelNotificationReceiverPendingIntent)
                        .build();
                SharedPreferences sharedPreferences = getSharedPreferences("NotificationData", 0);
                SharedPreferences.Editor editor = sharedPreferences.edit();
                editor.putString(String.valueOf(new Random(NOTIFICATION_ID)), messageBody);
                editor.apply();
                notificationManager.notify(NOTIFICATION_ID, notification);
                return;
            }
        }
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_ONE_SHOT);
        Notification notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                .setContentTitle(notificationHeader)
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setGroup(GROUP_KEY)
                .setContentIntent(pendingIntent)
                .setDeleteIntent(onCancelNotificationReceiverPendingIntent)
                .build();
        SharedPreferences sharedPreferences = getSharedPreferences("NotificationData", 0);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(String.valueOf(new Random(NOTIFICATION_ID)), messageBody);
        editor.apply();
        notificationManager.notify(NOTIFICATION_ID, notificationBuilder);
    }
    private NotificationCompat.InboxStyle getStyleForNotification(String messageBody) {
        NotificationCompat.InboxStyle inbox = new NotificationCompat.InboxStyle();
        SharedPreferences sharedPref = getSharedPreferences("NotificationData", 0);
        Map<String, String> notificationMessages = (Map<String, String>) sharedPref.getAll();
        Map<String, String> myNewHashMap = new HashMap<>();
        for (Map.Entry<String, String> entry : notificationMessages.entrySet()) {
            myNewHashMap.put(entry.getKey(), entry.getValue());
        }
        inbox.addLine(messageBody);
        for (Map.Entry<String, String> message : myNewHashMap.entrySet()) {
            inbox.addLine(message.getValue());
        }
        inbox.setBigContentTitle(this.getResources().getString(R.string.app_name))
                .setSummaryText("Tap to open");
        return inbox;
    }
}

当用户点击通知或删除通知时，从共享首选项中清除保存的数据。为此，创建一个广播接收器，它将清除您保存的所有数据。在可以从通知打开的活动的 onCreate 中调用它。

广播接收器代码如下

public class CancelNotificationReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    SharedPreferences sharedPreferences = context.getSharedPreferences("NotificationData", 0);
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.clear();
    editor.apply();
}}

请随时提出任何修改建议，以便我进一步优化。另外，如果有更好的方法，请在下面写下来。希望这会对某人有所帮助。

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