Only alert once option

README.md

@@ -116,6 +116,7 @@ A notification does have a set of configurable properties.
 | lockscreen    |         |     |                           |
 | mediaSession  |         |     |                           |
 | number        |         |     |                           |
+| onlyAlertOnce | x       | -   | Android only. Set this flag if you would only like the sound, vibrate and ticker to be played if the notification is not already showing (see [documentation](https://developer.android.com/reference/android/app/Notification.Builder#setOnlyAlertOnce(boolean))). |
 | priority      |         |     |                           |
 | progressBar   | x       | -   | Natively not supported by iOS, [see Stackoverflow](https://stackoverflow.com/questions/48500532/progress-view-in-local-notification/48500734#48500734) |
 | silent        |         |     |                           |

src/android/notification/Builder.java

@@ -129,7 +129,7 @@ public Notification build() {
         builder = findOrCreateBuilder()
                 .setDefaults(options.getDefaults())
                 .setExtras(extras)
-                .setOnlyAlertOnce(false)
+                .setOnlyAlertOnce(options.isOnlyAlertOnce())
                 .setChannelId(options.getChannel())
                 .setContentTitle(options.getTitle())
                 .setContentText(options.getText())

src/android/notification/Options.java

@@ -703,6 +703,15 @@ MediaSessionCompat.Token getMediaSessionToken() {
         return session.getSessionToken();
     }
 
+    /**
+     * Gets if the notification shall only alert once.
+     *
+     * @return true if the notification shall only alert once.
+     */
+    public boolean isOnlyAlertOnce(){
+        return options.optBoolean("onlyAlertOnce", false);
+    }
+
     /**
      * Strips the hex code #FF00FF => FF00FF
      *

www/local-notification.js

@@ -44,6 +44,7 @@ exports._defaults = {
     lockscreen    : true,
     mediaSession  : null,
     number        : 0,
+    onlyAlertOnce : false,
     priority      : 0,
     progressBar   : false,
     silent        : false,