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Tools and documentation on how to create Android applications.







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http://code.google.com/p/iscroll-js/
http://cubiq.org/iscroll
The overflow:scroll for mobile webkit. Project started because webkit for iPhone does not provide a native way to scroll content inside a fixed size (width/height) div. So basically it was impossible to have a fixed header/footer and a scrolling central area. Until now.

How to use

First of all we need to prevent the default behavior of standard touch events. This is easily done adding preventDefault() to the touchmove event. Then initialize the iScroll object on DOMContentLoaded or on window load. Here an example:

function loaded() {
	document.addEventListener('touchmove', function(e){ e.preventDefault(); });
	myScroll = new iScroll('scroller');
}
document.addEventListener('DOMContentLoaded', loaded);

iScroll takes two parameters. The first is mandatory and is the ID of the element you want to scroll. The second is optional and can be used to pass additional parameters (see below).

On the HTML/CSS side the scrolling area needs to be wrapped by an element which determines the scroller actual size. The following is a common tags configuration for an iScroll.

<div id="wrapper">
    <div id="scroller">
        <ul>
            <li>...</li>
        </ul>
    </div>
</div>

The #wrapper also needs some classes:

#wrapper {
    position:relative;
    z-index:1;
    width:/* your desired width, auto and 100% are fine */;
    height:/* element height */;
    overflow:/* hidden|auto|scroll */;
}

That’s it. Enjoy your scrolling. Have a look at the source code of the online example to get a better idea of how the iScroll works.

Syntax

The iScroll syntax is: iScroll(mixed element_id, object options).

element_id, can be both an object pointing to or a string with the ID name of the element to be scrolled. Example: iScroll(document.getElementsByTagName('div')[1]) or iScroll('scroller')

Accepted options are:

  • hScrollbar: set to false to never show the horizontal scrollbar. The default value true makes the iScroll smartly decide when the scrollbar is needed. Note that if device does not support translate3d hScrollbar is set to false by default.
  • vScrollbar: set to false to never show the vertical bar. The default value true makes the iScroll smartly decide when the scrollbar is needed. Note that if device does not support translate3d vScrollbar is set to false by default.
  • bounce: set to false to prevent the scroller to bounce outside of boundaries (Android behavior). Default true (iPhone behavior).
  • bounceLock:, if set to true the scroller stops bouncing if the content is smaller than the visible area. Default: false (as per native iphone scroll).
  • checkDOMChanges: set to false to prevent auto refresh on DOM changes. If you switch off this feature you have to call iScroll.refresh() function programmatically every time the DOM gets modified. If your code makes many subsequent DOM modifications it is suggested to set checkDOMChanges to false and to refresh the iScroll only once (ie: when all changes have been done). Default true.
  • fadeScrollbar: define wether the scrollbars should fade in/out. Default true on iPhone, false on Android. Set to false for better performance.
  • momentum: set to false to remove the deceleration effect on swipe. Default true on devices that support translate3d.
  • shrinkScrollbar: set to false to remove the shrinking scrollbars when content is dragged over the boundaries. Default true on iPhone, false on Android. It has no impact on performances.
  • desktopCompatibility: for debug purpose you can set this to true to have the script behave on desktop webkit (Safari and Chrome) as it were a touch enabled device.
  • snap: set to true to activate snap scroll.
  • scrollbarColor: changes the color of the scrollbar. It accepts any valid CSS color (default: 'rgba(0,0,0,0.5)'

Note: options must be sent as object not string. Eg:

myScroll = new iScroll(’scroller’, { checkDOMChanges: false, bounce: false, momentum: false });

Snap scroll

When calling iScroll with “snap” option the scrolling area is subdivided into pages and whenever you swipe the scroll position will always snap to the page. Have a look at the screencast to get an idea.

Probably the best way to use “snap” is by calling it without momentum and scrollbars:

new iScroll('scroller', { snap:true, momentum:false, hScrollbar:false, vScrollbar:false });

If you keep momentum, you get a free-scrolling that will always stop to prefixed positions.

To have a perfect snapping experience the scrolling area should be perfectly divisible by the container size. Eg: If the container width is 200px and you have 10 elements, the whole scroller should be 2000px wide. This is not mandatory as iScroll doesn’t break if the last page is smaller than the container.

Methods

  • refresh(): updates all iScroll variables. Useful when the content of the page doesn’t scroll and just “jumps back”. Call refresh() inside a zero setTimeout. Eg: setTimeout(function () { myScroll.refresh() }, 0).
  • scrollTo(x, y, timeout): scrolls to any x,y location inside the scrolling area.
  • scrollToElement(el, runtime): scrolls to any element inside the scrolling area. el must be a CSS3 selector. Eg: scrollToElement("#elementID", '400ms').
  • scrollToPage(pageX, pageY, runtime): if snap option is active, scrolls to any page. pageX and pageY can be an integer or prev/next. Two keywords that snap to previous or next page in the raw. The “carousel” example in the zip file is a good starting point on using the snap feature.
  • destroy(full): completely unloads the iScroll. If called with full set to true, the scroller is also removed from the DOM.

Best practices

DOM Changes – If scrolling doesn’t work after an ajax call and DOM change, try to initialize iScroll with checkDOMChanges: false and call refresh() function once the DOM modifications have been done. If this still doesn’t work try to put refresh() inside a 0ms setTimeout. Eg:

setTimeout(function () { myScroll.refresh(); }, 0);

Performance – CSS animations are heavy on the small device CPU. When too many elements are loaded into the scrolling area expect choppy animation. Try to reduce the number of tags inside the scrolling area to the minimum. Try to use just ULs for lists and Ps for paragraphs. Remember that you don’t actually need an anchor to create a button or send an action, so <li><a href="#" onclick="..." />text</a></li> is a waste of tags. You could remove the anchor and place the click event directly on the LI tag.

Try to avoid box-shadow and CSS gradients (especially on Android). I know they are cool and classy, but they don’t play well with CSS animations. Webkit on iPhone seems to handle shadows and gradients a bit better than its counterpart on Android, so you may selectively add/remove features based on the device.

Use a flat color for the #wrapper background, images in the scroller wrapper once again reduce performance.

Important: to preserve resources on devices that don’t support translate3d (namely: Android<2.0) iScroll disables momentum, scrollbars and bounce. You can however reactivate them using the respective options.

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http://code.google.com/p/jquery-infinite-carousel/

download : http://code.google.com/p/jquery-infinite-carousel/downloads/list

Add an infinite carousel on your site, the easy way. See a Demo here

Features

  • Really easy way to insert a quality HTML carousel on your site
  • Loop infinitely over items when clicking next or previous button
  • Avoid animation flickering due to multi-clicks on next and previous buttons

Some HTML

<div id="viewport"> 
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
<li>4</li>
<li>5</li>
</ul>
</div>
<a id="previous">Previous</a>
<a id="next">Next</a>

<!--
ul/li structure can be replaced by any other html structure as div/div, div/span...
-->

Some CSS

/* Comments on styles purpose in the source code */ 
#viewport{
width
: 240px;
overflow
:hidden;
}
#viewport ul{
position
: relative;
padding
: 0;
}
#viewport li{
width
: 100px;
height
: 50px;
float: left;
list
-style: none;
}

Some JavaScript : the magic

$('#viewport').carousel('#previous', '#next');

Tips

If you need to activate auto-scrolling on your carousel, simply simulate a click :

//The auto-scrolling function 
function slide(){
$
('#simpleNext').click();
}
//Launch the scroll every 2 seconds
var intervalId = window.setInterval(slide, 2000);

//On user click deactivate auto-scrolling
$
('#previous, #simpleNext').click(
function(event){
if(event.originalEvent){
window
.clearInterval(intervalId);
}
}
);






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A highly adaptable jQuery plugin for creating carousels and slideshows

download : http://code.google.com/p/carouslide/downloads/list

CarouSlide is an easy-to-implement, flexible yet powerful jQuery plugin that allows you to create a wide range of different carousel and slideshow implentations, from a small and semantic list of HTML content.

Some of its optional features include:

Three types of animation: fade, slide vertically and slide horizontally

  • Back/Next controls
  • Infinite horizontal scrolling
  • Timed/Automatic animations (including play/pause button)
  • Hover activation on navigation
  • Optional use of Easing plugin for animations
  • Adjustable animation timings
  • 9Kb (minified) file size

All you need to get going is:

$(".CarouSlide").CarouSlide();




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http://docs.phonegap.com/phonegap_accelerometer_accelerometer.md.html#Accelerometer

http://docs.phonegap.com/index.html

Accelerometer

Captures device motion in the x, y, and z direction.

Methods

Arguments

Objects (Read-Only)

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http://wowslider.com/ajax-jquery-slider-pulse-blinds-demo.html

WOW Slider - jQuery Carousel & Slider

WOW Slider is a jQuery Image Slider with stunning visual effects and fancy templates.

Features

  • # Awesome and unique transitions: Blinds, Fly, Squares, Explosion, Fade, Slices, Basic
  • # Stylish pre-made designs: Noir, Pulse, Crystal, Noble, Chrome, Block
  • # Lightweight (4-12Kb uncompressed)
  • # Prev/Next controls
  • # Bullet navigation
  • # Customizable speed, delay, size etc.
  • # Cross-browser compatibility
  • # Search engine friendly
  • # Clean and valid markup

More Info: http://wowslider.com/
Live Demos: http://wowslider.com/automatic-jquery-slider-noir-squares-demo.html
http://wowslider.com/ajax-jquery-slider-pulse-blinds-demo.html
http://wowslider.com/jquery-slider-crystal-basic-demo.html


Recent Demos


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