Why is my Button text forced to ALL CAPS on Lollipop?

Here's what I did in my values/themes.xml

    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="buttonStyle">@style/MyButton</item>
    </style>

    <style name="MyButton" parent="Widget.AppCompat.Button">
        <item name="android:textAllCaps">false</item>
    </style>

This is fixable in the application code by setting the button's TransformationMethod, e.g.

mButton.setTransformationMethod(null);

I don't have idea why it is happening but there 3 trivial attempts to make:

1. Use android:textAllCaps="false" in your layout-v21

2. Programmatically change the transformation method of the button. mButton.setTransformationMethod(null);

3. Check your style for Allcaps

Note: public void setAllCaps(boolean allCaps), android:textAllCaps are available from API version 14.

Set android:textAllCaps="false". If you are using an appcompat style, make sure textAllCaps comes before the style. Otherwise the style will override it. For example:

android:textAllCaps="false"
style="@style/Base.TextAppearance.AppCompat"