Change background colour of Activity

I have created an Android project and included Navigation Drawer Activity.



But the backgrounds of the activities are black.



I know I can change the background colour to white using XML or Java. But every time I do that I need to change other views as well. I checked the styles file. But it doesn't contain any tag about the background colour.

<resources>



    <!-- Base application theme. -->

    <style name="AppTheme" parent="Theme.AppCompat">

        <!-- Customize your theme here. -->

        <item name="colorPrimary">@color/colorPrimary</item>

        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>

        <item name="colorAccent">@color/colorAccent</item>

    </style>



    <style name="AppTheme.NoActionBar">

        <item name="windowActionBar">false</item>

        <item name="windowNoTitle">true</item>

    </style>



    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />



    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />



</resources>