You can apply a special theme to your application.
Create styles.xml in the res / values / directory and add something like this:
<style name="CustomTheme" parent="android:style/Theme">
<item name="android:actionBarSize">@dimen/action_bar_default_height</item>
</style>
Next, create a dimension.xml in the res / values / directory and add something like this:
<resources>
<dimen name="action_bar_default_height">55dp</dimen>
</resources>
Then in the application manifest, set the application theme as follows:
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:logo="@drawable/ic_launcher"
android:theme="@style/CustomTheme" >
...
</application>
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