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Q:

hide the title bar android studio

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar" />
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If you are using Android Studio, go to the .xml located below:
res/values/themes/themes.xml
You will find two themes.xml, the one of those will be the night setting
Open those .xml files and in the node named style change the value of the 
parent attribute to:
"Theme.MaterialComponents.DayNight.NoActionBar"
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getSupportActionBar().hide();
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