title: Action bar does not show
body: <p>I tried to implement an action bar in my application.</p>
  
  <p>menu.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;menu xmlns:android="http://schemas.android.com/apk/res/android" &gt;
  
      &lt;item
          android:id="@+id/itemAdd"
          android:showAsAction="ifRoom|withText"
          android:title="ADD"&gt;
      &lt;/item&gt;
      &lt;item
          android:id="@+id/itemRefresh"
          android:showAsAction="ifRoom|withText"
          android:title="REFRESH"&gt;
      &lt;/item&gt;
      &lt;item
          android:id="@+id/itemHelp"
          android:title="HELP"&gt;
      &lt;/item&gt;
  
  &lt;/menu&gt;
  </code></pre>
  
  <p>And created menu</p>
  
  <pre><code>@Override
      public boolean onCreateOptionsMenu(Menu menu) {
          super.onCreateOptionsMenu(menu);
          getMenuInflater().inflate(R.menu.menu, menu);
          return true;
      }
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/2MENl.png" alt="enter image description here"></p>
  
  <p>But it does not show the action bar even if <code>minSdkVersion</code> is 11. What is the reason?</p>