only alert once on multiple notifications, fix order of notifications

app/src/main/java/com/keylesspalace/tusky/NotificationPullJobCreator.java

@@ -36,6 +36,7 @@ import com.keylesspalace.tusky.util.OkHttpUtils;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import okhttp3.OkHttpClient;
@@ -129,6 +130,8 @@ public final class NotificationPullJobCreator implements JobCreator {
 
         private void onNotificationsReceived(AccountEntity account, List<Notification> notificationList) {
 
+            Collections.reverse(notificationList);
+
             BigInteger newId = new BigInteger(account.getLastNotificationId());
 
             BigInteger newestId = BigInteger.ZERO;
@@ -142,8 +145,6 @@ public final class NotificationPullJobCreator implements JobCreator {
                 }
 
                 if (isBiggerThan(currentId, newId)) {
-                    account.setLastNotificationId(notification.id);
-
                     NotificationHelper.make(context, notification, account);
                 }
             }

app/src/main/java/com/keylesspalace/tusky/util/NotificationHelper.java

@@ -152,8 +152,7 @@ public class NotificationHelper {
 
         } else {
             try {
-                String format = context.getString(R.string.notification_title_summary);
-                String title = String.format(format, currentNotifications.length());
+                String title = context.getString(R.string.notification_title_summary, currentNotifications.length());
                 String text = joinNames(context, currentNotifications);
                 builder.setContentTitle(title)
                         .setContentText(text);
@@ -167,6 +166,8 @@ public class NotificationHelper {
         builder.setVisibility(NotificationCompat.VISIBILITY_PRIVATE);
         builder.setCategory(NotificationCompat.CATEGORY_SOCIAL);
 
+        builder.setOnlyAlertOnce(true);
+
         NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
 
         //noinspection ConstantConditions
@@ -351,14 +352,15 @@ public class NotificationHelper {
     @Nullable
     private static String joinNames(Context context, JSONArray array) throws JSONException {
         if (array.length() > 3) {
+            int length = array.length();
             return String.format(context.getString(R.string.notification_summary_large),
-                    array.get(0), array.get(1), array.get(2), array.length() - 3);
+                    array.get(length-1), array.get(length-2), array.get(length-3), length - 3);
         } else if (array.length() == 3) {
             return String.format(context.getString(R.string.notification_summary_medium),
-                    array.get(0), array.get(1), array.get(2));
+                    array.get(2), array.get(1), array.get(0));
         } else if (array.length() == 2) {
             return String.format(context.getString(R.string.notification_summary_small),
-                    array.get(0), array.get(1));
+                    array.get(1), array.get(0));
         }
 
         return null;