How to disable night mode in my application even if night mode is enable in android 9.0 (pie)?

Question

I created my application before the android pie has been released, in every layout I put android: background = "white" it works fine in every device, but when my brother installed the application and enabled night mode my application becomes a disaster with one single move, everything turns into back and white movie.

<style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/COLOR_PRIMARY</item>
    <item name="colorPrimaryDark">@color/COLOR_PRIMARY</item>
    <item name="colorAccent">@color/COLOR_PRIMARY</item>
    <item name="cardViewStyle">@style/CardView</item>
    <item name="android:fontFamily">@font/helvetica</item>
</style>

my color primary is red.

Answer 1

You can put this, at the first line in the onCreate method of your launcher activity.

AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);