Initialize client side FeatureLayer with FeatureCollection

[PremRadhakrishnan]

Here is what I am trying to do , similar to initializing a GraphicsLayer with a graphicsProvider , I am trying to initialize a FeatureLayer with some features in a FeatureCollection

public function addFeatureLayer(features:Array):void
  {
   var featureSet:FeatureSet = new FeatureSet(features);
   var featureCollection:FeatureCollection = new FeatureCollection(featureSet);
   var featureLayer:FeatureLayer = new FeatureLayer();
   featureLayer.featureCollection = featureCollection;
  
   map.addLayer(featureLayer)
  }

The problem is that nothing displays on the map. Can anyone point out what I am doing wrong ? or is FeatureLayer not meant to be used this way?

Thanks in advance

[IvanBespalov · Accepted solution]

add layerDetails property to FeatureCollection

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
      xmlns:s="library://ns.adobe.com/flex/spark" 
      xmlns:mx="library://ns.adobe.com/flex/mx"
      xmlns:esri="http://www.esri.com/2008/ags">
 
 <s:layout>
  <s:VerticalLayout paddingBottom="10"
        paddingLeft="10"
        paddingRight="10"
        paddingTop="10" />
 </s:layout>
 <fx:Script>
  <![CDATA[
   import com.esri.ags.FeatureSet;
   import com.esri.ags.Graphic;
   import com.esri.ags.SpatialReference;
   import com.esri.ags.geometry.Extent;
   import com.esri.ags.geometry.MapPoint;
   import com.esri.ags.layers.FeatureLayer;
   import com.esri.ags.layers.supportClasses.FeatureCollection;
   import com.esri.ags.layers.supportClasses.LayerDetails;
   import com.esri.ags.symbols.SimpleMarkerSymbol;
   
   private var spatialReference:SpatialReference = new SpatialReference(102100); // the same as in base(tiled) layer 
   private var initialExtent:Extent;
   
   private function addFeatureLayer(features:Array):void
   {
    var featureSet:FeatureSet = new FeatureSet(features);
    var layerDetails:LayerDetails = new LayerDetails();
    var featureLayer:FeatureLayer = new FeatureLayer();
    featureLayer.featureCollection = new FeatureCollection(featureSet, layerDetails);
    
    map.addLayer(featureLayer);
    map.initialExtent = initialExtent;
    map.zoomToInitialExtent();
   }


   protected function onAddButtonClick(event:MouseEvent):void
   {
    var graphicCollection:Array = new Array();
    
    // create 10 features with random location
    for (var i:int; i < 10; i++)
    {
     var x:Number = Math.random() * 1000000;
     var y:Number = Math.random() * 1000000;
     var pt:MapPoint = new MapPoint(x, y, spatialReference);
     
     var attributes:Object = new Object();
     attributes.timeStamp = new Date();
     
     var graphic:Graphic = new Graphic(pt, new SimpleMarkerSymbol(), attributes);
     graphic.toolTip = attributes.timeStamp.toString();
     graphicCollection.push(graphic);
     
     var ptExtent:Extent = new Extent(x, y, x, y, spatialReference);
     if (!initialExtent)
     {
      initialExtent = ptExtent;
     }
     else
     {
      initialExtent = initialExtent.union(ptExtent);
     }
    }
    
    addFeatureLayer(graphicCollection);
   }

  ]]>
 </fx:Script>
 
 <s:Button label="Add feature layer" 
     click="onAddButtonClick(event)" />
 
 <esri:Map id="map">
  <esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>
 </esri:Map>
 
</s:Application>

[PremRadhakrishnan]

Thank you that worked. The documentation on FeatureLayer is vague at best.