Basically what this question is asking, but in XML:
Change EditTextPreference dialog input text color
The accepted answer is to write a whole class and edit each single element manually. This can't be the only solution. There must be some way to set it in XML styles.
I've tried this:
<!-- Preferences style -->
<style name="CustomPreferenceScreen" parent="DarkGalaxy">
<item name="android:textColor">@color/lightGray</item>
<item name="android:textColorSecondary">@color/hintText</item>
<item name="android:listDivider">@color/hintTextDarker</item>
<item name="trackTint">@color/prefs_switch_color</item>
<item name="alertDialogTheme">@style/PreferenceSubDialogTheme</item>
</style>
<style name="PreferenceSubDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">
<item name="android:background">@color/brighterGalaxy</item>
<item name="android:textColorAlertDialogListItem">@color/lightGray</item>
<item name="android:textColor">@color/lightGray</item>
<item name="editTextPreferenceStyle">@style/CustomEditTextPreferenceStyle</item>
</style>
<style name="CustomEditTextPreferenceStyle" parent="Preference.DialogPreference.EditTextPreference">
<item name="android:textColor">@color/lightGray</item>
<item name="android:editTextColor">@color/lightGray</item>
</style>
I think I'm just not hitting the right attribute, as it is buried in PreferenceActivity > EdittextPreference > Dialog > EdiText inside the dialog
