title: Adding View extending from SurfaceView to layout gives me a blank screen
body: <p>I'm very new to Android programming, so this is probably something pretty basic.  I just have an xml layout with a few buttons.  I'm trying to follow the model given by the JetBoy demo, so I'm adding a view to the layout which extends SurfaceView.  When this new view is put in my xml layout, I just get a blank screen.  </p>
  
  <p>Here's the XML layout if it helps.  The gameview element is what causes the screen to be blank</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:alwaysDrawnWithCache="true"&gt;
   &lt;game.test.gameEngine
        android:id="@+id/gameView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/&gt;
  &lt;Button android:text="Easy" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/EasyButton"&gt;&lt;/Button&gt;
  &lt;Button android:text="Medium" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/MedButton"&gt;&lt;/Button&gt;
  &lt;Button android:text="Hard" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/HardButton"&gt;&lt;/Button&gt;
  &lt;DatePicker android:id="@+id/DatePicker01" android:layout_width="wrap_content" android:layout_height="wrap_content"&gt;&lt;/DatePicker&gt;&lt;Button android:id="@+id/Button04" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Exit"&gt;&lt;/Button&gt;
  
  
  &lt;/LinearLayout&gt;
  </code></pre>