In your themes.xml, add the following:
<resources xmlns:android="http://schemas.android.com/apk/res/android">
<style name="Theme.Your_Theme" parent="Theme.MaterialComponents.DayNight.NoActionBar" android:forceDarkAllowed="true">
[...]
<item name="alertDialogTheme">@style/YourAlertDialogTheme</item>
</style>
</resources>
In the styles.xml, add the style for the dialog itself:
<style name="YourAlertDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
<!-- Changes the dialog background color -->
<item name="android:windowBackground">@color/light_grey</item>
<!-- Changes the title and message text color -->
<item name="android:textColorPrimary">@color/alert_dialog_button_txt</item>
<!-- If using Material Components, use this for buttons -->
<!--<item name="buttonBarPositiveButtonStyle">@style/Widget.MaterialComponents.Button.TextButton</item>-->
<item name="buttonBarPositiveButtonStyle">@style/Widget.Your.Button.TextButton</item>
<item name="buttonBarNegativeButtonStyle">@style/Widget.Your.Button.TextButton</item>
</style>
<style name="Widget.Your.Button.TextButton" parent="Widget.MaterialComponents.Button.TextButton">
<!-- Changes the text and icon color -->
<item name="android:textColor">@color/alert_dialog_button_txt</item>
<!--<item name="iconTint">@color/red_status</item>-->
<!-- Changes the click ripple color -->
<!--<item name="rippleColor">@color/green_dark</item>-->
</style>
In your your_preferences.xml, add:
<PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto">
<EditTextPreference
app:key="pk_quality_threshold"
app:title="@string/title_quality_threshold"
app:dialogTitle="@string/title_quality_threshold"
app:summary="@string/leak_quality_threshold_summary"
app:defaultValue="40"
app:dialogLayout="@layout/pref_edittext" />
Then define the custom layout for the EditTextPreference to change the color of the edit text background, text and cursor:
pref_edittext.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- Used in ui_preferences.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp"
android:orientation="vertical">
<!-- If you use: android:textCursorDrawable="@null"
the cursor will automatically inherit the color defined in
the android:textColor property -->
<EditText
android:id="@android:id/edit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="@color/alert_dialog_button_txt"
android:background="@color/white"
android:textCursorDrawable="@null"
android:padding="8dp" />
</LinearLayout>
Done!
