How to set the default dark mode?

Hi Everyone,
I am looking for a solution by which I can fix my App in dark mode only in Android. I did this for iOS but looking for Android too.
here is my style.cs

    <?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MainTheme" parent="MainTheme.Base">
        <item name="colorPrimaryDark">#1E2027</item>
    </style>
<style name="AppTheme" parent="Theme.AppCompat.DayNight">
 <!-- Base theme applied no matter what API -->
    <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
    <item name="windowNoTitle">true</item>
    <!--We will be using the toolbar so no need to show ActionBar-->
    <item name="windowActionBar">false</item>
    <!-- Set theme colors from https://aka.ms/material-colors -->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#1E2027</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <item name="colorPrimaryDark">#1E2027</item>
    <!-- colorAccent is used as the default value for colorControlActivated
     which is used to tint widgets -->
    <item name="colorAccent">#000000</item>
<item name="android:textAllCaps">false</item>
    <!-- You can also set colorControlNormal, colorControlActivated
     colorControlHighlight and colorSwitchThumbNormal. -->
    <item name="windowActionModeOverlay">true</item>
    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>
</style>
<style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
    <item name="colorAccent">#1E2027</item>
</style>