UPDATING devices.xml FOR A NEW DEVICE
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First, import the sdk/apps/DeviceConfig project into ADT, and run it
on the given device.  When prompted, click on the button on the bottom
to generate a config file, then send it to yourself, for example via
Drive.

Next, edit the device description as follows:

* Double check the vendor (fix capitalization etc)

* Fix the screen attributes. In particular, the detection does not
  seem to account for the space taken by the system bar, so look up
  the official specs for the device and change the screen size. This
  also affects the screen diagonal length, and the xdpi and ydpi
  densities. For example, here are the specs used for the Nexus 4,
  Nexus 7 and Nexus 10 configurations:

      http://www.google.com/nexus/4/specs/
      http://www.google.com/nexus/7/specs/
      http://www.google.com/nexus/10/specs/


* For devices that don't have external storage, the element
   <d:removable-storage> </d:removable-storage>
  is missing the required unit attribute; change it to
   <d:removable-storage unit="MiB"> </d:removable-storage>

* The config detector cannot detect the available states; insert these
  manually by copying from another device description in devices.xml,
  assuming it has the normal states (landscape, portrait). Make sure
  you pick the default state carefully; e.g. for Nexus 4 portrait is
  the default and for Nexus 10 landscape is the default.

* Double check the <ram> and <internal-storage> values; they did not
  seem to be correct for the devices I configured. I looked up the
  specs instead, and then converted to the (required) MiB or GiB
  units. E.g. 2GB of RAM means 1.86GiB.

  NOTE: The <ram> element (and possibly the other storage sizes as
  well) requires the value to be an integer, so use KiB rather than
  say 1.86GiB here (since decimals aren't allowed).

  I used the GB/GiB calculator found here:
  http://www.dr-lex.be/info-stuff/bytecalc.html

* The DeviceConfig app does not produce values for all the required
  elements. It leaves these as blank, but if you don't fill them in,
  the devices.xml file will fail to parse properly at runtime, which
  means the devices won't be added.

  To fix this, make sure the following elements have proper values
  (some sample values are shown; if these are not correct, consult
  devices.xsd for the valid enum values):
            <d:mechanism>finger</d:mechanism>
            <d:screen-type>capacitive</d:screen-type>
            <d:power-type>battery</d:power-type>
            <d:nav>nonav</d:nav>
            <d:cpu>Dual-core A15</d:cpu>
            <d:gpu>Quad-core Mali T604</d:gpu>

* You must add this required line (set value to true or false as
  appropriate) to the end of the <software> section:
            <d:status-bar>true</d:status-bar>
  after the <gl-extensions> element.

* If you are running a newer version of the OS than the device
  originally shipped with, adjust the <api-level> element to the
  lowest supported value.

* Reformat the XML, using a 4 space indent. The format of the file as
  emitted by DeviceConfig does not use the same formatting as the
  overall devices.xml file, and besides, a couple of lines aren't
  indented as expected.

* Finally, merge the new device description (e.g. everything except
  the root XML <devices> element) into devices.xml and check it in.

* To test, copy the file into the SDK install (tools/lib/devices.xml),
  open the layout editor and make sure the new device shows up in the
  Device dropdown, and that when selecting it things look good. You
  should also try creating a device based on this description in the
  AVD manager and then creating and running an AVD based on it.