ArcGIS Runtime SDK for Android 10.2.9 not displayed FeatureServer

[Viết_KiêuNguyễn]

String FEATURE_SERVER_AM = "http://220.231.126.125:6080/arcgis/rest/services/wsms_cnhd/WebAM/FeatureServer/0";
UserCredentials creds = new UserCredentials();
creds.setUserAccount(USER_NAME, PASSWORD);


ArcGISFeatureLayer secureFeatureLayer = new ArcGISFeatureLayer(
 FEATURE_SERVER_AM,
 MODE.ONDEMAND,
 creds);
mMapView.addLayer(secureFeatureLayer);