<p>This is a demo application highlighting how to advertise and discover local services that are Wi-Fi peer to peer network capable with
the Wi-Fi Direct Service Discovery APIs.  Service discovery on Wi-Fi direct allows applications to discover and enagage with  peers that support a certain service. 
As an example, a gaming application can find and associate with devices that support the game. This application allows you to chat with a peer after a succesful connection.</p>

<p>The source code for this demo app shows how to accomplish three key things
with Wi-Fi Direct  Service Discovery APIs: Advertise services, discover services and connect to peers advertising such services</p>

<p>The application includes:<p>
<ul> <li><a
    href="src/com/example/android/wifidirect/discovery/WiFiServiceDiscoveryActivity.html"><code>WiFiServiceDiscoveryActivity</code></a>
  &mdash; the main <code>Activity</code> that contains two fragments to handle app's UI. It advertises and discovers services and also registers a broadcast receiver for Wi-Fi Direct related events.</li> <li><a
    href="src/com/example/android/wifidirect/discovery/WiFiDirectBroadcastReceiver.html"><code>
      WiFiDirectBroadcastReceiver</code></a> &mdash; a <code>BroadcastReceiver</code>
  that listens for Wi-Fi Direct related events and passes them to
  <code>WiFiServiceDiscoveryActivity</code> and it's fragments for neccesary action.</li> <li><a
    href="src/com/example/android/wifidirect/discovery/WiFiDirectServicesList.html"><code>WiFiDirectServicesList</code></a>
  &mdash; a <code>ListFragment</code> that displays available services, peers and their status. </li>
<li><a href="src/com/example/android/wifidirect/discovery/WiFiChatFragment.html"><code>WiFiChatFragment</code></a>
  &mdash; a <code>Fragment</code> that displays handles chat UI </li>
<li><a href="src/com/example/android/wifidirect/discovery/ChatManager.html"><code>ChatManager</code></a>
  &mdash; a <code>Runnable</code> that continously performs Socket I/O.</li>
<li><a href="src/com/example/android/wifidirect/discovery/GroupOwnerSocketHandler.html"><code>GroupOwnerSocketHandler</code></a>
  &mdash; a <code>Thread</code> that implements a server side Socket handler and spawns a client socket per connection.</li> </ul>
<li><a href="src/com/example/android/wifidirect/discovery/ClientSocketHandler.html"><code>GroupOwnerSocketHandler</code></a>
  &mdash; a <code>Thread</code> that implements a client side Socket handler.</li> </ul>
<p>If you are developing an application that uses the Wi-Fi Direct Service Discovery APIs, remember that the
feature is supported only on Android 4.1 (API level 16) and higher versions of
the platform. To ensure that your application can only
be installed on devices that are capable of supporting Wi-Fi Direct Service Discovery, remember to add the
following to the application's manifest before publishing to Google Play:</p>
<ul> <li><code>&lt;uses-sdk android:minSdkVersion="16" /&gt;</code>, which
  indicates to Google Play and the platform that your application requires
  Android 4.1 or higher. For more information, see <a
    href="../../../guide/appendix/api-levels.html">API Levels</a> and the
  documentation for the <a
    href="../../../guide/topics/manifest/uses-sdk-element.html"><code>&lt;uses-sdk&gt;</code></a>
  element.</li> </ul> <p>To control how Google Play filters your application
from devices that do not support Wi-Fi Direct mode, remember to add the following to the
application's manifest <ul> <li><code>&lt;uses-feature
    android:name="android.hardware.wifi.direct" /&gt;</code>, which tells Google
  Play that your application uses the Wi-Fi Direct API. The declaration should include
  an <code>android:required</code> attribute that indicates whether you want
  Google Play to filter the application from devices that do not offer Wi-Fi Direct support. Other <code>&lt;uses-feature&gt;</code> declarations may also be
  needed, depending on your implementation. For more information, see the
  documentation for the <a
    href="../../../guide/topics/manifest/uses-feature-element.html"><code>&lt;uses-feature&gt;</code></a>
  element.</li> </ul>
<p>For more information about using the Wi-Fi Direct Service Discovery APIs, see the <a
  href="../../../reference/android/net/wifi/p2p/package-summary.html"><code>android.net.wifi.p2p	</a></code>
documentation. </p>

<img alt="" src="../images/WifiDirect.png" />