棒棒糖:如何改变AutoTextView的下划线颜色？

<style name="CustomAutoTextViewStyle" parent="Widget.AppCompat.AutoCompleteTextView">
    <item name="android:textColor">@color/your_text_color</item>
    <item name="android:textColorHint">@color/your_hint_color</item>
    <item name="android:background">@drawable/your_background_drawable</item>
    <item name="android:textCursorDrawable">@drawable/your_cursor_drawable</item>
</style>

<AutoCompleteTextView
    android:id="@+id/autoCompleteTextView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="@style/CustomAutoTextViewStyle" />

AutoCompleteTextView autoCompleteTextView = findViewById(R.id.autoCompleteTextView);
autoCompleteTextView.setDropDownBackgroundResource(R.drawable.your_dropdown_background);