动态修改ViewPagerIndicator CustomTabPageIndicator Tab标签文字颜色

在style.xml中修改CustomTabPageIndicator的android:textColor属性即可：

   <style name="CustomTabPageIndicator" parent="Widget.TabPageIndicator">
        <item name="android:background">@drawable/tab_indicator</item>
        <item name="android:textAppearance">@style/CustomTabPageIndicator.Text</item>
        <item name="android:textSize">18sp</item>
        <item name="android:textColor">@color/tab_color</item>
        <item name="android:dividerPadding">8dp</item>
        <item name="android:showDividers">middle</item>
        <item name="android:paddingLeft">10dp</item>
        <item name="android:paddingRight">10dp</item>
        <item name="android:fadingEdge">horizontal</item>
        <item name="android:fadingEdgeLength">8dp</item>
    </style>