fix(indexappcontent): Return observable for onItemPressed

src/@ionic-native/plugins/index-app-content/index.ts

@@ -1,5 +1,8 @@
 import { Injectable } from '@angular/core';
 import { Plugin, Cordova, IonicNativePlugin } from '@ionic-native/core';
+import { Observable } from 'rxjs/Observable';
+
+declare var window: any;
 
 export interface IndexItem {
   domain: string;
@@ -95,12 +98,18 @@ export class IndexAppContent extends IonicNativePlugin {
   /**
    * If user taps on a search result in spotlight then the app will be launched.
    * You can register a Javascript handler to get informed when this happens.
-   * @param {IndexItem} Clicked Item
-   * @return {Promise<any>} Returns promise
+   * @returns {Observable<any>} returns an observable that notifies you when he user presses on the home screen icon
    */
   @Cordova()
-  onItemPressed(payload: IndexItem) {
-    return;
+  onItemPressed(): Observable<any> {
+    return new Observable(observer => {
+      if (window.plugins.indexAppContent) {
+        window.plugins.indexAppContent.onItemPressed = observer.next.bind(observer);
+      } else {
+        observer.error('Index-App-Content plugin is not available.');
+        observer.complete();
+      }
+    });
   }
 
   /**