You can change ActionBar Title's text size by simply adding android:textSize attribute to the <style> that you have defined in the styles.xml file.
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- set the size of action bar title . -->
<item name="android:textSize">12sp</item>
</style>
</resources>Note that the <application> tag in AndroidManifest.xml has the theme set as the value of the name tag in style.xml. Also set the textSize value in sp unit.
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