UPDATE FOR DESIGN LIBRARY 23.2.0+
The original answer doesn't work with design library 23.2.0 or later. Thanks for @fahmad6 pointed out in comment, in case someone missed that comment, I'll put it here. You need to set both textAllCaps
and android:textAllCaps
to false
to disable all capitalize setting.
<style name="MyCustomTextAppearance" parent="TextAppearance.Design.Tab">
<item name="textAllCaps">false</item>
<item name="android:textAllCaps">false</item>
</style>
ORIGINAL ANSWER
By default, tabs are created by TabLayout sets the textAllCaps property to be true, you have to define a style making this flag false.
<style name="MyCustomTabLayout" parent="Widget.Design.TabLayout">
<item name="tabTextAppearance">@style/MyCustomTextAppearance</item>
</style>
<style name="MyCustomTextAppearance" parent="TextAppearance.Design.Tab">
<item name="textAllCaps">false</item>
</style>
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