If you want to remove ActionBar from a particular Android Activity that extends ActionBarActivity from appcompat-v7 library then all you need to do is add the below to tags in the style.xml file,
<item name="android:windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>
Example :
<resources>
<!--
Base application theme, dependent on API level. This theme is replaced
by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
-->
<style name="AppBaseTheme" parent="Theme.AppCompat.Light">
<!--
Theme customizations available in newer API levels can go in
res/values-vXX/styles.xml, while customizations related to
backward-compatibility can go here.
-->
</style>
<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
<item name="android:windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>
</style>
</resources>
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