path: root/docs/html/develop/index.jd

fullpage=true
page.title=Develop
header.hide=1
carousel=1
tabbedList=1
@jd:body

<style>
#noplayer-message {
position:absolute;top:50%;left:0;width:100%;z-index:-1;text-align:center;display:none;
}
#player-frame object {z-index:1;}
</style>

<div id="player-wrapper">
  <div id="player-frame">
    <div id="noplayer-message">
      <!-- busted flash player message -->
      Your video is supposed to appear here.<br/>
      Make sure you have the <a href="http://get.adobe.com/flashplayer/" target="_blank">Flash&reg; Player</a>.
    </div>
    <div id="player"><!-- Youtube embeds here... actually replaces this div --></div>
    <a class="close" onclick="$('#player-wrapper').hide()">close video</a>
  </div>
</div>


<div class="wrap">
   <!-- Slideshow -->
   <div class="slideshow-container slideshow-develop col-16">
       <a href="" class="slideshow-prev">Prev</a>
       <a href="" class="slideshow-next">Next</a>
       <div class="frame">
           <ul>
               <li class="item carousel-home">
                 <div class="col-8">
                   <img
src="http://4.bp.blogspot.com/-g05If_eKKRQ/UAcrVLI-OYI/AAAAAAAAAr8/AWvunVb5S-w/s320/nexus7.png"
class="play no-shadow no-transform" />
                 </div>
                <div class="content-right col-6">
                  <p class="title-intro">From the blog:</p>
                  <h2>Getting Your App Ready for Jelly Bean and Nexus 7</h2>
                  <p>For many people, their first taste of Jelly Bean will be on the beautiful 
                    Nexus 7. While most applications will run just fine on Nexus 7, who wants 
                    their app to be just fine? Here are some tips for optimizing your application 
                    to make the most of this device.</p>
                  <p><a
href="http://android-developers.blogspot.com/2012/07/getting-your-app-ready-for-jelly-bean.html" class="button">Read
more</a></p>
                </div>            
              </li>
               <li class="item carousel-home">
                 <div class="col-8">
                   <img
src="http://1.bp.blogspot.com/-6qyjPxTuzv0/T6lde-Oq_fI/AAAAAAAABXc/zle7OFEGP44/s400/fddns%2Bcopy.png"
class="play no-shadow no-transform" />
                 </div>
                <div class="content-right col-6">
                  <p class="title-intro">From the blog:</p>
                  <h2>Using DialogFragments</h2>
                  <p>In this post, I'll show how to use DialogFragments with the <a
href="http://developer.android.com/reference/android/support/v4/app/DialogFragment.html">v4 support
library</a> (for backward compatibility on pre-Honeycomb devices) to show a simple edit dialog and
return a result to the calling Activity using an interface.</p>
                  <p><a
href="http://android-developers.blogspot.com/2012/05/using-dialogfragments.html" class="button">Read
more</a></p>
                </div>            
              </li>
               <li class="item carousel-home">
                   <div class="col-8">
                     <img
src="http://1.bp.blogspot.com/-6K1kfNOdek8/T72bXvtTSQI/AAAAAAAABmw/kYzmJt0_328/s1600/google-play-subscriptions.png" class="play"></div>
                   <div class="content-right col-6">
                   <p class="title-intro">From the blog:</p>
                   <h2>In-app Subscriptions in Google Play</h2>
                   <p>Starting today, developers can use In-app Billing to sell monthly or annual
subscriptions from inside of their apps. All subscriptions are auto-renewing, for every app and game
and every type of subscription product.</p>
                   <p><a class="button"
href="http://android-developers.blogspot.com/2012/05/in-app-subscriptions-in-google-play.html">Read
more</a></p>
                   </div>                
                </li>
               <li class="item carousel-home">
                   <div class="col-8">
                     <img
src="{@docRoot}images/home/developers_live.png" class="play"></div>
                   <div class="content-right col-6">
                   <h2>Learn what great apps are made of</h2>
                   <p>Every week we host a live broadcast in which we review a collection of apps and games
                     nominated by the creators. It's no-holds-barred and we tell you exactly what is flawed or
                     fantastic in each app and how to make improvements.</p>
                   <p><a href="" class="button" onclick="$('ul#DevelopersLive li:first
a').click();return false;">Watch the latest review</a></p>
                   </div>                
                </li>
           </ul>
       </div>
   </div>
   <!-- /End slideshow -->
</div>
<div class="wrap">
	<!-- news and feature feed -->
	<div class="feed col-8" style="margin-left:0">
		<ul class="feed-nav">
			<li class="active">DEVELOPER NEWS</li>
			<li>FEATURED DOCS</li>
		</ul>
		<div class="feed-container">
			<div class="feed-frame">
                                <!-- DEVELOPER NEWS -->
				<ul>
					<li><a href="http://android-developers.blogspot.com/2012/06/android-sdk-tools-revision-20.html">
                                          <div class="feed-image" style="background:url('http://1.bp.blogspot.com/-Kp1qE5du6l8/T-xurIjfPgI/AAAAAAAABAM/kuWQwPgi0rw/s640/newactivity+(1).png') no-repeat 0 0">
                                          </div>
                                          <h4>Android SDK Tools, Revision 20</h4>
                                          <p>Along with the preview of the Android 4.1 (Jelly Bean) platform, we launched Android SDK Tools R20 and ADT 20.0.0. Here are a few things...</p>
					</a></li>
					<li><a href="http://android-developers.blogspot.com/2012/04/faster-emulator-with-better-hardware.html">
                                          <div class="feed-image" style="background:url('../images/emulator-wvga800l.png') no-repeat 0 0">
                                          </div>
                                          <h4>A Faster Emulator with Better...</h4>
                                          <p>Today we’re thrilled to announce several significant improvements to the emulator, including a dramatic...</p>
					</a></li>
					<li><a href="http://android-developers.blogspot.com/2012/04/android-c2dm-client-login-key.html">
                                          <div class="feed-image" style="background:url('../images/develop/auth-code.png') no-repeat 0 0">
                                          </div>
                                          <h4>Android C2DM — Client Login key...</h4>
                                          <p>In the upcoming weeks, some of the older Client
					Login authentication keys will expire. If you generated the token you’re...</p>
					</a></li>
					<li><a href="http://android-developers.blogspot.com/2012/04/accessibility-are-you-serving-all-your.html">
                                          <div class="feed-image">
                                          </div>
                                          <h4>Accessibility</h4>
                                          <p>We recently published some new resources to help developers make their Android applications more accessible... </p>
					</a></li>
                                      
				</ul>
                                <!-- FEATURED DOCS -->
				<ul>
					<li><a href="{@docRoot}guide/google/play/billing/index.html">
						<h4>Google Play In-app Billing</h4>
						<p>In-app Billing is a Google Play service that lets you sell digital content from inside your applications. You can sell products as standard in-app products (one-time purchase) or with subscriptions (recurring...</p>
					</a></li>
					<li><a href="{@docRoot}guide/topics/providers/contacts-provider.html">
						<h4>Contacts Provider</h4>
						<p>The Contacts Provider is a powerful and flexible Android component that manages the device's central repository of data about people. You can use it to build powerful social features...</p>
					</a></li>
					<li><a href="{@docRoot}training/efficient-downloads/index.html">
						<h4>Transferring Data Without Draining the Battery</h4>
						<p>This training class demonstrates the best practices for scheduling and executing downloads using techniques such as caching, polling, and prefetching.</p>
					</a></li>
					<li><a href="{@docRoot}training/backward-compatible-ui/index.html">
						<h4>Creating Backward-Compatible UIs</h4>
						<p>This training class demonstrates how to use UI components and APIs available in newer versions of Android in a backward-compatible way, ensuring that your application still runs on previous versions...</p>
					</a></li>
				</ul>
			</div>
		</div>
	</div>	<!-- /news and feature feed -->
	<!-- video feed -->
	<div class="feed col-8" style="margin-right:0">
		<ul class="feed-nav">
			<li class="active">DEVELOPERS LIVE</li>
			<li>VIDEO PLAYLISTS</li>
		</ul>
		<div class="feed-container">
			<div class="feed-frame">
				<ul id="DevelopersLive">
				</ul>
				<ul id="VideoPlaylists">
				</ul>
			</div>
		</div>
	</div>
	<!-- /video feed -->
</div>

<br class="clearfix"/>

      
      
      
      
      
      
      
      

<script src="//swfobject.googlecode.com/svn/trunk/swfobject/swfobject.js" type="text/javascript"></script>
<script type="text/javascript">

/* Load a video into the player box.
 * @param id        The YouTube video ID
 * @param title     The video title to display in the player box (character escaped)
 * @param autoplay  Whether to automatically play the video
 */
function loadVideo(id, title, autoplay) {
  swfobject.embedSWF('//www.youtube.com/v/' + id + '&rel=1&border=0&fs=1&autoplay=' +
      (autoplay?1:0), 'player', '525', '330', '9.0.0', false, false, {allowfullscreen: 'true'});
  $("#videoPlayerTitle").html("<h2>" + unescape(title) + "</h2>");
  $("#player-wrapper").show();
  setTimeout(function(){$('#noplayer-message').show()}, 2000);
}

/* Draw all videos from a playlist into a 'videoPreviews' list
 * @param data  The feed data returned from the youtube request
 */
function renderVideoPlaylists(data) {
  var MAX_LIST_DESC_LENGTH = 130; // the length at which we will trim the description
  var MAX_VIDEO_DESC_LENGTH = 100; // the length at which we will trim the description
  var MAX_LIST_LENGTH = 4; // number of videos to put in the list
  var feed = data.feed;
  var entries = feed.entry || [];
  var playlistId = feed.yt$playlistId.$t;

  var $ulVideos = $('<ul style="display:none"/>');
  var summary = feed.media$group.media$description != null ? feed.media$group.media$description.$t : feed.subtitle.$t;
  
  var $liPlaylist = $('<li class="playlist"></li>');
  var $aPlaylist = $('<a href="" onclick="togglePlaylist(this);return false;"></a>');
  $liPlaylist.append($aPlaylist);
  $aPlaylist.append('<h4>' + feed.title.$t + '</h4>');
  
  var playlistDescription = summary.substr(0, MAX_LIST_DESC_LENGTH);
  playlistDescription += playlistDescription.length == MAX_LIST_DESC_LENGTH ? "..." : ""; // add ellipsis if we've chopped the description
  $aPlaylist.append('<p>' +  playlistDescription + '</p>');
  
  // Loop through each entry (each video) and add it to the 'videoPreviews' list
  var length = feed.entry.length < MAX_LIST_LENGTH ? feed.entry.length : MAX_LIST_LENGTH; // max of 4 videos per list
  for (var i = 0; i < length; i++) {
    var entry = entries[i];

    var title = entry.title.$t;
    var id = entry.media$group.yt$videoid.$t;
    var thumbUrl = entry.media$group.media$thumbnail[0].url;
    var fullDescription = entry.media$group.media$description.$t;
    var playerUrl = entry.media$group.media$content[0].url;

    var shortDescription = fullDescription.substr(0, MAX_VIDEO_DESC_LENGTH);
    shortDescription += shortDescription.length == MAX_VIDEO_DESC_LENGTH ? "..." : ""; // add ellipsis if we've chopped the description

    var img = $('<img src="' + thumbUrl + '" width="60" height="45"/>');
    var a = $('<a href="#" onclick="loadVideo(\'' + id + '\',\'' + escape(title) + '\',true); return false;" />');
    var pShortDescription = $('<p>' + shortDescription + '</p>');
    var h5Title = "<h5>" + title + "</h5>";
    var li = $('<li class="playlist-video"/>');

    li.append(a);
    a.append(img).append(h5Title).append(pShortDescription);

    $ulVideos.append(li);
    
    // use the first entry's thumbnail for the playlist
    if (i == 0) {
      $aPlaylist.prepend('<img src="' + thumbUrl + '" width="120" height="90"/>');
    }
  }
  
  if (feed.entry.length > MAX_LIST_LENGTH) {
    // add item to go to youtube for playlist
    $ulVideos.append('<li class="more"><a href="//www.youtube.com/playlist?list=PL' + playlistId + '">More &raquo;</a></li>');
  }

  $liPlaylist.append($ulVideos);
  $('#VideoPlaylists').append($liPlaylist);
}


function renderDevelopersLivePlaylist(data) {

  var MAX_DESC_LENGTH = 125; // the length at which we will trim the description
  var feed = data.feed;
  var entries = feed.entry || [];
  var playlistId = feed.yt$playlistId.$t;

  var ul = $('#DevelopersLive');

  // Loop through each entry (each video) and add it to the '#DevelopersLive' list
  for (var i = 0; i < 4; i++) {
    var entry = entries[i];

    var title = entry.title.$t;
    var id = entry.media$group.yt$videoid.$t;
    var thumbUrl = entry.media$group.media$thumbnail[0].url;
    var fullDescription = entry.media$group.media$description.$t;
    var playerUrl = entry.media$group.media$content[0].url;
    var shortDescription = fullDescription.substr(0, MAX_DESC_LENGTH);
    shortDescription += shortDescription.length == MAX_DESC_LENGTH ? "..." : ""; // add ellipsis if we've chopped the description

    var img = $('<img src="' + thumbUrl + '" width="120" height="90"/>');
    var a = $('<a href="#" onclick="loadVideo(\'' + id + '\',\'' + escape(title) + '\',true); return false;" />');
    var pShortDescription = $('<p>' + shortDescription + '</p>');
    var h4Title = "<h4>" + title + "</h4>";
    var li = $('<li/>');

    li.append(a);
    a.append(img).append(h4Title).append(pShortDescription);

    ul.append(li);
  }
}



/* This 'playlist' object defines the playlist IDs for each tab.
 * Each name inside 'playlist' corresponds to class names for the tab that the playlists belong to (eg: "googleioTab" and "googleioBox" divs).
 * Each string in 'ids' is the ID of a YouTube playlist that belongs in the corresponding tab.
 */
var playlists = {
  'googleio' : {
    'ids': ["4C6BCDE45E05F49E"]
  },
  'fridayreview' : {
    'ids': ["B7B9B23D864A55C3"]
  },
  'officehours' : {
    'ids': ["7383D9AADA6E6D55"]
  },
  'about' : {
    'ids': ["D7C64411AF40DEA5"]
  }
};

/* Request the playlist feeds from YouTube */
function showVideosPlaylists() {
  for (var x in playlists) {
    var ids = playlists[x].ids;
    for (var i in ids) {
      var script = "<script type='text/javascript' src='//gdata.youtube.com/feeds/api/playlists/"
                    + ids[i] +
                    "?v=2&alt=json-in-script&max-results=50&callback=renderVideoPlaylists&orderby=published'><\/script>";
      $("body").append(script);
    }
  }
}


/* Request the playlist feeds from YouTube */
function showDevelopersLivePlaylist() {
  var playlistId = "B7B9B23D864A55C3"; /* The Friday Review */
  var script = "<script type='text/javascript' src='//gdata.youtube.com/feeds/api/playlists/"
                + playlistId +
                "?v=2&alt=json-in-script&max-results=10&callback=renderDevelopersLivePlaylist&orderby=published'><\/script > ";
  $("body").append(script);
}


function togglePlaylist(listLink) {
  var $list = $(listLink).parent();
  var $ul = $list.find('ul');
  if ($ul.is(":visible")) {
    $ul.slideUp(function() {
      $list.css({'height':'inherit'});
    });
  } else {
    $list.closest('ul').find('li.playlist').find('ul').slideUp();
    $ul.slideDown();
    $list.css({'height':'auto'});
  }
}

showDevelopersLivePlaylist();
showVideosPlaylists();
</script>