Add onBackgroundPushReceived method

Author: MaximBelov

Example/index.html

@@ -34,6 +34,10 @@
           console.log("onPushReceived: " + JSON.stringify(event))
         })
 
+        Airship.push.onBackgroundPushReceived(function(event) {
+          console.log("onBackgroundPushReceived: " + JSON.stringify(event))
+        })
+
         Airship.push.onNotificationResponse(function(event) {
           console.log("onNotificationResponse: " + JSON.stringify(event))
         })

cordova-airship/types/index.d.ts

@@ -1082,6 +1082,16 @@ export interface AirshipPush {
         callback: (event: PushReceivedEvent) => void
     ): Cancellable
 
+    /**
+     * Background push received listener.
+     *
+     * @param callback The callback.
+     * @return A cancellable that can be used to cancel the listener.
+     */
+    onBackgroundPushReceived(
+        callback: (event: PushReceivedEvent) => void
+    ): Cancellable
+
     /**
      * Notification response listener.
      *

cordova-airship/www/Airship.js

@@ -377,6 +377,11 @@ airship.push.onPushReceived = function (callback) {
     return registerListener("airship.event.push_received", callback)
 }
 
+airship.push.onBackgroundPushReceived = function (callback) {
+    argscheck.checkArgs('F', 'Airship.push.onBackgroundPushReceived', arguments)
+    return registerListener("airship.event.background_push_received", callback)
+}
+
 airship.push.onNotificationResponse = function (callback) {
     argscheck.checkArgs('F', 'Airship.push.onNotificationResponse', arguments)
     return registerListener("airship.event.notification_response", callback)