title: Detect the click event of home button in android (application launcher icon)
body: <p>How to identify the click event in the application launcher icon in android? I need to go to home screen once the  user click on this icon. For example, assume this is the manifest file:</p>
  
  <pre><code>&lt;application
          android:allowBackup="true"
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
  .......... 
  </code></pre>
  
  <p>Using the following code  segment in <code>main activity</code> inside <code>onCreate()</code></p>
  
  <pre><code>actionBar=getActionBar();
  actionBar.setHomeButtonEnabled(true);
  </code></pre>
  
  <p>the application icon is click-able .I don't' have any way to detect the click event of this. Is this possible to do in android. Any suggestion to do that? </p>