Why AppCompat does not support the current theme features windowActionBar: false

Question

Why AppCompat does not support the current theme features { windowActionBar: false, windowActionBarOverlay: false, android:windowIsFloating: false, windowActionModeOverlay:

Answer 1

Try this,

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>

    <item name="windowActionBar">false</item>
    <item name="windowActionBarOverlay">false</item>
    <item name="windowIsFloating">false</item>
    <item name="windowActionModeOverlay">false</item>
    <item name="windowNoTitle">false</item>
</style>

Answer 2

You need to check both styles files styles.xml and styles.xml(v21) in case you have it in your code.

Both styles files must have a parent theme based on the Theme.AppCompat theme, or a child of it.

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    ...
</style>

Answer 3

go to your styles.xml and change you main theme parent with NoActionBar like this

 <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
 </style>