title: Android: I've build custom view in layout/custom.xml How to know it's package name
body: <p>I have main.xml and custom.xml</p>
  
  <p>I want that custom.xml will be like user control, so I've put 2 these tags into mail.xml like this:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      android:background="#FFFFFF" &gt;
  
       &lt;custom
           xmlns:android="http://schemas.android.com/apk/res/android"
           android:layout_height="wrap_content"
           android:layout_width="fill_parent" /&gt;
  
       &lt;custom
           xmlns:android="http://schemas.android.com/apk/res/android"
           android:layout_height="wrap_content"
           android:layout_width="fill_parent" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>But it doesn't work.</p>