Theme Aware Material Design Spinner

layout.xml

     <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
            app:popupTheme="@style/AppTheme.PopupOverlay">

            <Spinner
                android:id="@+id/main_spinner"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
                
        </android.support.v7.widget.Toolbar>

Spinner Setup (Activity)

Spinner spinner = (Spinner) findViewById(R.id.main_spinner);

ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<>(getSupportActionBar().getThemedContext(),
                R.layout.spinner_list_style,
                getResources().getStringArray(R.array.countries));
                
 spinnerAdapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
 
  spinner.setAdapter(spinnerAdapter);

spinner_dropdown_item.xml

<!--Used for Spinner's list item-->
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/spinner_dropdown"
    style="?android:attr/spinnerDropDownItemStyle"
    android:layout_width="match_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:ellipsize="marquee"
    android:singleLine="true"
    android:textColor="?attr/textColorAlertDialogListItem" />

spinner_list_style.xml

<!--Used for the Spinner title indicator-->
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/spinner_list_item"
    style="@style/TextAppearance.AppCompat.Title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ellipsize="marquee"
    android:paddingEnd="@dimen/activity_margin"
    android:paddingRight="@dimen/activity_margin"
    android:singleLine="true"
    android:textColor="@android:color/white" />

styles.xml

<!-- Base application theme (LIGHT). -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        ...
        <item name="spinnerStyle">@style/MySpinner</item>
    </style>
    
    <!-- Base application theme (DARK). -->
     <style name="AppTheme.Dark" parent="Theme.AppCompat">
        ...
        <item name="spinnerStyle">@style/MySpinner.Dark</item>
    </style>
    
     <style name="MySpinner" parent="Base.Widget.AppCompat.Spinner">
        <item name="popupTheme">@style/ThemeOverlay.AppCompat.Light</item>
    </style>

    <style name="MySpinner.Dark" parent="MySpinner">
        <item name="popupTheme">@style/ThemeOverlay.AppCompat.Dark</item>
    </style>