docs: update device dashboard; add historical chart

the hands of users. For information about how to target your application to devices based on

platform version, see <a href="{@docRoot}guide/appendix/api-levels.html">API Levels</a>.</p>

<p class="note"><strong>Note:</strong> This data is based on the number

of Android devices that have accessed Android Market within a 14-day period

ending on the data collection date noted below.</p>

<h3 id="Current">Current Distribution</h3>

<p>The following pie chart and table is based on the number of Android devices that have accessed

Android Market within a 14-day period ending on the data collection date noted below.</p>

<div class="dashboard-panel">

<img alt="" width="460" height="250"

src="http://chart.apis.google.com/chart?&cht=p&chs=460x250&chd=t:0.1,24.6,25.0,0.1,0.3,50.0&chl=

Android%201.1|Android%201.5|Android%201.6|Android%202.0|Android%202.0.1|Android%202.1&chco=c4df9b,

6fad0c" />

<img alt="" height="250" width="460"

src="http://chart.apis.google.com/chart?&cht=p&chs=460x250&chd=t:0.3,21.3,23.5,53.1,1.8&chl=Other*|

Android%201.5|Android%201.6|Android%202.1|Android%202.2&chco=c4df9b,6fad0c" />

<table>

<tr>

  <th>Android Platform</th>

  <th>Percent of Devices</th>

  <th>Platform</th>

  <th>API Level</th>

  <th>Distribution</th>

</tr>

<tr><td>Android 1.1</td><td>0.1%</td></tr> 

<tr><td>Android 1.5</td><td>24.6%</td></tr> 

<tr><td>Android 1.6</td><td>25.0%</td></tr> 

<tr><td>Android 2.0</td><td>0.1%</td></tr> 

<tr><td>Android 2.0.1</td><td>0.3%</td></tr> 

<tr><td>Android 2.1</td><td>50.0%</td></tr> 

<tr><td>Android 1.5</td><td>3</td><td>21.3%</td></tr>

<tr><td>Android 1.6</td><td>4</td><td>23.5%</td></tr>

<tr><td>Android 2.1</td><td>7</td><td>53.1%</td></tr>

<tr><td>Android 2.2</td><td>8</td><td>1.8%</td></tr>

</table>

<p><em>Data collected during two weeks ending on June 16, 2010</em></p>

</div>

<p><em>Data collected during two weeks ending on July 1, 2010</em></p>

<p style="font-size:.9em">* <em>Other: 0.3% of devices running obsolete versions</em></p>

</div><!-- end dashboard-panel -->

<h3 id="Historical">Historical Distribution</h3>

<p>The following stacked line graph provides a history of the relative number of

active Android devices running different versions of the Android platform. It also provides a

valuable perspective of how many devices your application is compatible with, based on the

platform version.</p>

<p>Notice that the platform versions are stacked on top of each other with the oldest active

version at the top. This format indicates the total percent of active devices that are compatible

with a given version of Android. For example, if you develop your application for

the version that is at the very top of the chart, then your application is

compatible with 100% of active devices (and all future versions), because all Android APIs are

forward compatible. Or, if you develop your application for a version lower on the chart,

then it is currently compatible with the percentage of devices indicated on the y-axis, where the

line for that version meets the y-axis on the right.</p>

<p>Each dataset in the timeline is based on the number of Android devices that accessed

Android Market within a 14-day period ending on the date indicated on the x-axis.</p>

<div class="dashboard-panel">

<img alt="" height="265" width="700" style="padding:5px;background:#fff"

src="http://chart.apis.google.com/chart?&cht=lc&chs=700x265&chxt=x,y,r&chxr=0,0,10%7C1,0,100%7C2,0,

100&chxl=0%3A%7C2010/02/01%7C02/15%7C03/01%7C03/15%7C04/01%7C04/15%7C05/01%7C05/15%7C06/01%7C06/15%

7C2010/07/01%7C1%3A%7C0%25%7C25%25%7C50%25%7C75%25%7C100%25%7C2%3A%7C0%25%7C25%25%7C50%25%7C75%25%

7C100%25&chxp=0,0,1,2,3,4,5,6,7,8,9,10&chxtc=0,5&chd=t:99.0,99.2,99.4,99.5,99.6,99.6,99.6,99.7,100.6

,101.1,99.9%7C63.4,62.5,61.6,60.6,61.5,61.7,62.3,63.5,73.0,76.4,78.6%7C22.6,23.2,24.3,25.4,29.4,30.2

,32.7,35.3,46.2,51.3,55.1%7C0.0,0.0,0.0,0.0,4.0,28.3,32.0,34.9,45.9,51.0,54.9%7C0.0,0.0,0.0,0.0,0.0,

0.0,0.0,0.0,0.8,1.2,1.8&chm=tAndroid%201.5,7caa36,0,0,15,,t::-5%7Cb,c3df9b,0,1,0%7CtAndroid%201.6,

638d23,1,0,15,,t::-5%7Cb,b0db6e,1,2,0%7CtAndroid%202.0.1,496c13,2,0,15,,t::-5%7Cb,9ddb3d,2,3,0%

7CtAndroid%202.1,2f4708,3,5,15,,t::-5%7Cb,89cf19,3,4,0%7CB,6fad0c,4,5,0&chg=9,25&chdl=Android%201.5%

20(API%20Level%203)%7CAndroid%201.6%20(API%20Level%204)%7CAndroid%202.0.1%20(API%20Level%206)%

7CAndroid%202.1%20(API%20Level%207)%7CAndroid%202.2%20(API%20Level %208)&chco=add274,

9ad145,84c323,6ba213,507d08" />

<p><em>Last historical dataset collected during two weeks ending on July 1, 2010</em></p>

</div><!-- end dashboard-panel -->

<div class="dashboard-panel">

<img alt="" width="460" height="250"

src="http://chart.apis.google.com/chart?&cht=p&chs=460x250&chd=t:1.1,57.8,41.0&chl=Small%20/%20ldpi|

src="http://chart.apis.google.com/chart?&cht=p&chs=460x250&chd=t:1.4,54.5,44.1&chl=Small%20/%20ldpi|

Normal%20/%20mdpi|Normal%20/%20hdpi&chco=c4df9b,6fad0c" />

<table>

<th scope="col">High Density</th>

</tr>

<tr><th scope="row">Small</th> 

<td class='cent hi'>1.1%</td> 

<td class='cent hi'>1.4%</td> 

<td></td> 

<td></td> 

</tr> 

<tr><th scope="row">Normal</th> 

<td></td> 

<td class='cent hi'>57.8%</td> 

<td class='cent hi'>41.0%</td> 

<td class='cent hi'>54.5%</td> 

<td class='cent hi'>44.1%</td> 

</tr> 

<tr><th scope="row">Large</th> 

<td></td> 

</tr> 

</table>

<p><em>Data collected during two weeks ending on June 16, 2010</em></p>

<p><em>Data collected during two weeks ending on July 1, 2010</em></p>

</div>