To change the Height of Android ActionBar,
1. Go to style.xml under values folder.
style.xml<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- set the height of Action Bar . -->
<item name="actionBarSize">36dip</item>
</style>
</resources>
2. Now, add <item name="actionBarSize">36dip</item>
3. Go to AndroidManifest.xml and within <application> check that android:theme is set as name-value in style tag ( AppTheme in my case)

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