Preference Dark Theme

# bikin primary_preference.xml dan letakkan di drawable

    <?xml version="1.0" encoding="utf-8"?>
    <selector
        xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_enabled="false" android:color="#50ffffff" />
        <item android:state_enabled="true" android:color="#ffffffff" />
    </selector>

# bikin secondary_preference.xml dan letakkan juga di drawable

    <?xml version="1.0" encoding="utf-8"?>
    <selector
        xmlns:android="http://schemas.android.com/apk/res/android">
            <item android:state_enabled="false" android:color="#50cccccc" />
            <item android:state_enabled="true" android:color="#ffcccccc" />
    </selector>


# Buka style dan tambahkan kode berikut di dalamnya

    <style name="PreferencesThemes" parent="@style/AppTheme">
            <item name="android:textColorPrimary">@drawable/primary_preference</item>
            <item name="android:textColorSecondary">@drawable/secondary_preference</item>
        </style>

# Buka AndroidManifest tambahkan android:theme="@style/PreferencesThemes" di activity DeltaPreference sehingga menjadi seperti ini

<activity android:name="delta.labs.quote.DeltaPreference" android:screenOrientation="behind" android:theme="@style/PreferencesThemes"/>