Android performance

[matfin]

Hi Folks,

Working on an app here that has a DataView with a list of DataItems with each DataItem being quite design heavy.

I'm using the latest version of Sencha Touch 2 and wrapping it all up in PhoneGap 2.0.

Problem is, performance when scrolling the list of stories on the main page is middling to poor on Android Ice Cream Sandwich devices (Galaxy S2, Galaxy S3 a bit better) and unusable on Android 2.3 devices (HTC Desire HD devices).

From reading around various discussion forums I have tried the following:

-- Enabled hardware acceleration from within my Android Manifest XML file
-- Disabled all CSS3 rules - things like box shadows and rounded corners
-- Added the following to the config part of my views - see below:

scrollable: {			direction: 'vertical',
			directionLock: true,
			momentumEasing:  {
				momentum: {
					acceleration: 30,
					friction: 0.5
				},
				bounce: {
					acceleration: 0.0001,
					springTension: 0.9999
				},
				minVelocity: 5
			},
			outOfBoundRestrictFactor: 0
		},

I cannot launch the app when it performs so badly. Is there anything else I can do to improve performance? Any tips would be very much appreciated.

Thanks

[huberte]

Why dont you build the app with stbuild ?

[mitchellsimoens]

Also note, using components within a dataview essentially triples the size of the DOM and maybe more depending on what components you use.

[matfin]

Hey everyone.

Here is the code I have been using for the list of items described. I have no other components in this DataView list by the look of things. Would the size of my XTemplate have anything to do with performance issues?

I did try cutting down the template significantly and the performance was still quite slow.

var storylistpanel = Ext.define('Application.view.MyItemList', {
	extend: 'Ext.dataview.DataView',
	xtype: 'myitemlistpanel',
	requires: [
		'Ext.dataview.DataView',
		'Application.store.Items',
		'Ext.plugin.PullRefresh',
		'Ext.plugin.ListPaging'
	],
	config: {
		xtype: 'dataview',
		scrollable: {
			direction: 'vertical'
		},
		loadingText: false,
		
		html: '<div class="loading">'
			+		'<h2 class="loading-logo">'
			+		'</h2>'
			+		'<h4>CHECKING...</h4>'
			+		'<ul>'
			+			'<li>Loading....</li>'
			+		'</ul>'
			+	'</div>',
		plugins: [
			{
				xclass: 'Ext.plugin.PullRefresh',
				pullRefreshText: 'Pull to refresh',
				refreshFn: function(plugin){
					application.app.item_offset = 0;
					application.app.item_limit = 10;
					plugin.up().getStore().load({
						params: {
							start: application.app.item_offset,
							finish: application.app.item_limit
						},
						callback: function(){
							Ext.each(Ext.query('.item'), function(item){
								item.style.display = 'inline';
							});
						}
					});
				}
			},
			{
				xclass: 'Ext.plugin.ListPaging',
				loadMoreText: 'Loading more items',
				autoPaging: true,
				loadNextPage: function(){
					myitemlistpanel = Ext.ComponentQuery.query('myitemlistpanel')[0];
					store = myitemlistpanel.getStore();
					application.app.item_offset += 10;
					application.app.item_limit += 10;
					store.load({
						params: {
							start: application.app.item_offset,
							finish: application.app.item_limit
						},
						callback: function(){
							Ext.each(Ext.query('.item'), function(item){
								item.style.display = 'inline';
							});
						}
					});
				}
			}
		],
		itemTpl: Ext.create(
			'Ext.XTemplate',
			'<div class="item-wrapper">'
			+	'<article class="item">'
			+		'<div class="top-item-wrapper">'
			+			'<div class="box-shadow">'
			+				'<div class="item-img" style="background-image:url({image})">'
			+				'</div>'
			+				'</div>'
			+ 				'<div class="item-head"">'
			+				'<h2>{headline}</h2>'
			+				'<div class="meta">'
			+					'<img src="{location}.png" width="31" height="17" alt="{location}" />'
			+				'</div>'
			+			'</div>'
			+			'<p>{item_description}</p>'
			+		'</div>'
			+		'<tpl if="relatedItemCount &gt; 0">'
			+			'<div class="related-item">'
			+				'<a class="rel-trigger">See related Items({relatedItemCount})</a>'
			+				'<div class="list">'
			+				'</div>'
			+			'</div>'
			+		'</tpl>'
			+	'</article>'
			+'</div>',
			{
				itemsNum: function(score){
					//code to calculate integer
					return 0;
				},
				topNum: function(topscore){
					//more code to calculate something
					return 0;
				}
			}
		),
		store: 'Items',
		listeners: {
			painted: function(){
				application.app.item_offset = 0;
				application.app.item_limit = 10;
				store = this.getStore();
				store.setProxy({url: application.app.url});
				store.load({
					params: {
						start: application.app.item_offset,
						finish: application.app.item_limit
					},
					callback: function(){
						setTimeout(function(){
							Ext.query('.loading')[0].style.display = 'none';
							Ext.each(Ext.query('.item'), function(item){
								item.style.display = 'inline';
							});
							Ext.query('.x-list-paging')[0].style.display = 'inline';
						}, 2000);
					},
					scope: this
				});
			},
			erased: function(){
				Ext.query('.loading')[0].style.display = 'inline';
				Ext.each(Ext.query('.item'), function(item){
					item.style.display = 'none';
				});
			}
		}
	}
});

[jaeger25]

I found that disabling hardware acceleration actually sped my app up considerably. Might be worth it to give that a shot

[YomeKitsuma]

Hi all,

I've the same "little issue" on my HTC one X - Android 4 (which is normally a good device).

I've also notice that on iOS (iPhone 4) the list is scrolling better.

And, as i pointed it out on one of my (furious) post, it seems that 2.1.0 List Dom Structure has completly change (more inner div), and maybe this slow down the scrolling. maybe =D

Cheer

[intellix]

Found this today... guessing it'll help you a fair bit with your DataView issues
http://www.sencha.com/forum/showthre...browser-events