title: Q: Facebook SDK Main Activity
body: <p>When they tell me to add default activity class name, should I write <code>com.example.milanovic.hellou.MainActivity</code> or <code>MainActivity</code> or <code>.MainActivity</code>.
  <code>com.example.milanovic.hellou</code> is the name of the package I'm using.</p>
  
  <pre><code>&lt;activity android:name=".MainActivity" &gt;
      &lt;intent-filter&gt;
          &lt;action android:name="android.intent.action.MAIN" /&gt;
  
          &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
      &lt;/intent-filter&gt;
  &lt;/activity&gt;
  </code></pre>