title: Android - ActionBar icon not showhing
body: <p>I have trouble seeing the icons in the ActionBar.
  I also read around here in StackOverFlow, but nothing... </p>
  
  <p>Here is my action.xml</p>
  
  <pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto" &gt;
  
  &lt;item
      android:id="@+id/addAct"
      android:icon="@android:drawable/ic_input_add"
      android:background="@null"
      app:showAsAction="always"
      android:title="@string/add"
      /&gt;
  &lt;item
      android:id="@+id/searchAct"
      android:icon="@android:drawable/ic_menu_search"
      app:showAsAction="ifRoom"
      android:title="Cerca"
      android:actionViewClass="android.widget.SearchView"
      /&gt;
  
  &lt;item
      android:id="@+id/visualizza"
      android:title="@string/txtVisualizza"
      app:showAsAction="always"
      &gt;
  
  &lt;/item&gt;
  </code></pre>
  
  <p></p>
  
  <p>Here, is AndroiManifest.xml:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  </code></pre>
  
  <p></p>
  
  <pre><code>&lt;uses-sdk
      android:minSdkVersion="11"
      android:maxSdkVersion="21"/&gt;
  
  &lt;application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" &gt;
      &lt;activity
          android:name=".MainActivity"
          android:label="@string/app_name"&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;
      &lt;activity
          android:name=".WriteActivity"
          android:label="@string/title_activity_write" &gt;
      &lt;/activity&gt;
  &lt;/application&gt;
  </code></pre>
  
  <p></p>
  
  <p>Here, MainActivity:</p>
  
  <pre><code>public class MainActivity extends Activity { ...
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.action, menu);
      return super.onCreateOptionsMenu(menu);
  }
  </code></pre>
  
  <p>In the xml code, I have used the app for ShowAsAction, but this not seems be the problem.
  Thanks for any help :)</p>