title: Unable to change Appcompat theme from light to holo dark
body: <p>I am trying to change the theme of my app completely, This is what I modified &amp; tried :</p>
  
  <p><code>styles.xml</code> in values folder is</p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme, dependent on API level. This theme is replaced
      by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="android:Theme.Holo"&gt;
      &lt;!--
          Theme customizations available in newer API levels can go in
          res/values-vXX/styles.xml, while customizations related to
          backward-compatibility can go here.
      --&gt;
  &lt;/style&gt;
  
  &lt;!-- Application theme. --&gt;
  &lt;style name="AppTheme" parent="AppBaseTheme"&gt;
      &lt;!-- All customizations that are NOT specific to a particular API-level can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>values-v11 <code>styles.xml</code></p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme for API 11+. This theme completely replaces
      AppBaseTheme from res/values/styles.xml on API 11+ devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="android:Theme.Holo"&gt;
      &lt;!-- API 11 theme customizations can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>values-v14 <code>styles.xml</code></p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme for API 14+. This theme completely replaces
      AppBaseTheme from BOTH res/values/styles.xml and
      res/values-v11/styles.xml on API 14+ devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="android:Theme.Holo"&gt;
      &lt;!-- API 14 theme customizations can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>Mainifest.xml</p>
  
  <pre><code>&lt;application
     .....
     android:theme="@style/AppTheme" &gt;
     .......
  &lt;/application&gt;
  </code></pre>
  
  <p>I am using <code>ActionBarActivity</code> &amp; <code>appcompat_v7</code> but the app crashes by <code>java.lang.RuntimeException: Unable to start activity ComponentInfo{com...}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity</code></p>
  
  <p>Am I missing something...?</p>
  
  <p>How can I solve this problem?</p>
  
  <p>Please help...</p>
  
  <p>Thanks in advance !</p>
  
  <hr>
  
  <p><strong>EDIT:</strong> When using Appcompat theme , the theme was light, the code was:</p>
  
  <p>So, using appcompat theme my <code>styles.xml</code> in values folder was</p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme, dependent on API level. This theme is replaced
      by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="Theme.AppCompat.Light"&gt;
      &lt;!--
          Theme customizations available in newer API levels can go in
          res/values-vXX/styles.xml, while customizations related to
          backward-compatibility can go here.
      --&gt;
  &lt;/style&gt;
  
  &lt;!-- Application theme. --&gt;
  &lt;style name="AppTheme" parent="AppBaseTheme"&gt;
      &lt;!-- All customizations that are NOT specific to a particular API-level can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>values-v11 <code>styles.xml</code></p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme for API 11+. This theme completely replaces
      AppBaseTheme from res/values/styles.xml on API 11+ devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="Theme.AppCompat.Light"&gt;
      &lt;!-- API 11 theme customizations can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>values-v14 <code>styles.xml</code></p>
  
  <pre><code>&lt;resources&gt;
  
  &lt;!--
      Base application theme for API 14+. This theme completely replaces
      AppBaseTheme from BOTH res/values/styles.xml and
      res/values-v11/styles.xml on API 14+ devices.
  --&gt;
  &lt;style name="AppBaseTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
      &lt;!-- API 14 theme customizations can go here. --&gt;
  &lt;/style&gt;
  
  &lt;/resources&gt;
  </code></pre>
  
  <p>Mainifest.xml</p>
  
  <pre><code>&lt;application
     .....
     android:theme="@style/AppTheme" &gt;
     .......
  &lt;/application&gt;
  </code></pre>
  
  <p>And I dont know how to change appcompat theme from light to holo dark. Please help</p>