[TIMOB-16223] Android: Add support selectedBackgroundGradient for ListView

   var _window = Ti.UI.createWindow({
   	backgroundColor: '#fff'
   });
   var search = Titanium.UI.createSearchBar({
   			    barColor:'#000',
   			    showCancel:true,
   			    height:43,
   			    top:0,
   			});
   
   			 
   			var listView = Ti.UI.createListView({headerView:search});
   			 
   			var listSection = Ti.UI.createListSection();
   			 
   			var fruits = ['Papaya', 'Peach', 'Pear', 'Persimmon', 'Pineapple', 'Pluot', 'Pomegranate'];
   			 
   			var gradient = {
   			    colors: [ { color: 'red', offset: 0.0}, { color: 'blue', offset: 0.5 }, { color: 'red', offset: 1.0 } ],
   			    type: 'linear'
   			};
   			var gradient2 = {
   			    colors: [ { color: 'purple', offset: 0.0}, { color: 'yellow', offset: 0.5 }, { color: 'purple', offset: 1.0 } ],
   			    type: 'linear'
   			};
   			 
   			var data = [];
   			for (var i = 0; i < fruits.length; i++) {
   			    data.push({
   			        properties: {
   			            title: fruits[i],
   			            searchableText: fruits[i],
   			            backgroundGradient: gradient,
   			            selectedBackgroundGradient: gradient2
   			        }
   			    });
   			}
   			var currentSelected = -1;
   			var previousSelected = -1;
   			 
   			listSection.setItems(data);
   			listView.sections = [listSection];
   			listView.addEventListener('itemclick', function(e) {
   				Ti.API.info('The '+e.type+' event happened at '+ e.itemIndex);
   				if (currentSelected != e.itemIndex) {
   					listSection.updateItemAt(e.itemIndex, 
   						{
   							properties: {
   					            title: fruits[e.itemIndex],
   					            searchableText: fruits[e.itemIndex],
   					            backgroundGradient: gradient2
   					        }
   					    }
   					)
   					previousSelected = currentSelected;
   					currentSelected = e.itemIndex;
   				}
   				if(previousSelected > -1) {
   					listSection.updateItemAt(previousSelected, 
   						{
   							properties: {
   					            title: fruits[previousSelected],
   					            searchableText: fruits[previousSelected],
   					            backgroundGradient: gradient
   						    }
   					    }
   					)
   				}				
   				
   			});
   			
   			search.addEventListener('cancel', function() {
   			    search.blur();
   			});
   			search.addEventListener('change', function(e) {
   			    listView.searchText = e.value;
   			    listSection.updateItemAt(currentSelected, 
   						{
   							properties: {
   					            title: fruits[currentSelected],
   					            searchableText: fruits[currentSelected],
   					            backgroundGradient: gradient
   					        }
   					    }
   					)
   				currentSelected = -1;
   				previousSelected = -1;
   			});
   			
   			_window.add(listView);
   			 
   			 
   			var view = Ti.UI.createView({
   			    backgroundGradient: gradient,
   			    width: 100,
   			    height: 100,
   			    bottom: 0,
   			    left: 0
   			});
   			var view2 = Ti.UI.createView({
   			    backgroundGradient: gradient2,
   			    width: 100,
   			    height: 100,
   			    bottom: 0,
   			    right: 0
   			});
   			_window.add(view);
   			_window.add(view2);
   
   				
   		_window.open();