Thay đổi màu chữ và thanh trượt

<android.support.design.widget.TabLayout
    android:id="@+id/tabLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    style="@style/CustomTabLayoutStyle"/>

Styles:

<style name="CustomTabLayoutStyle" parent="Base.Widget.Design.TabLayout">
    <item name="tabSelectedTextColor">@color/tab_text_selected</item>
    <item name="tabIndicatorColor">@color/tab_indicator</item>
    <item name="tabTextAppearance">@style/CustomTabTexStyle</item>
</style>

<style name="CustomTabTexStyle" parent="TextAppearance.Design.Tab">
    <item name="android:textSize">14sp</item>
    <item name="android:textColor">@color/tab_text</item>
    <item name="textAllCaps">false</item>
    ...
</style>