动态修改ViewPagerIndicator CustomTabPageIndicator Tab标签文字颜色

ViewPagerIndicator 的CustomTabPageIndicator 默认是没有Tab选中修改TextView颜色特效的。

可以通过以下方式实现：

新建viewpager_title_textcolor.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <!-- Non focused states -->
    <item android:state_focused="false" android:state_pressed="false" android:state_selected="false" android:color="#99000000"/>
    <item android:state_focused="false" android:state_pressed="false" android:state_selected="true" android:color="#FF00A639"/>

    <!-- Focused states -->
    <item android:state_focused="true" android:state_pressed="false" android:state_selected="false" android:color="#99000000"/>
    <item android:state_focused="true" android:state_pressed="false" android:state_selected="true" android:color="#FF00A639"/>

    <!-- Pressed -->
    <item android:state_pressed="true" android:color="#FF00A639"/>

</selector>

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/custom_tab_indicator</item>
        <item name="android:textAppearance">@style/CustomTabPageIndicator.Text</item>
        <item name="android:textColor">@drawable/viewpager_title_textcolor</item>
        <item name="android:textSize">20sp</item>
        <item name="android:divider">@drawable/custom_tab_indicator_divider</item>
        <item name="android:showDividers">middle</item>
        <item name="android:paddingLeft">8dp</item>
        <item name="android:paddingRight">8dp</item>
        <item name="android:paddingTop">5dp</item>
        <item name="android:fadingEdge">horizontal</item>
        <item name="android:fadingEdgeLength">8dp</item>
    </style>