Button do not morph when not using background attribute

Button does not morph when we don’t set any background to the button. Here is my xml

<br.com.simplepass.loading_button_lib.customViews.CircularProgressButton
                    android:id="@+id/welcome_signin_button"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_horizontal"
                    android:layout_marginTop="@dimen/form_horizontal_margin"
                    android:theme="@style/AppTheme.Button"
                    style="@style/progressButtonStyle"
                    android:text="@string/welcome_signin_cta"
                    />

And here is the styles applyed

<style name="AppTheme.Button">
        <item name="android:textAllCaps">false</item>
        <item name="android:colorButtonNormal">?attr/colorAccent</item>
        <item name="android:textColor">@color/white</item>
        <item name="android:textStyle">bold</item>
    </style>


    <style name="progressButtonStyle" parent="Widget.AppCompat.Button">
        <item name="finalCornerAngle">50dp</item>
        <item name="initialCornerAngle">2dp</item>
        <item name="spinning_bar_color">@color/white</item>
        <item name="spinning_bar_padding">4dp</item>
        <item name="spinning_bar_width">2dp</item>
    </style>

[JasonHezz]

loadGradientDrawablefails can’t get RippleDrawable too

[vincentnock]

Hmmm, if I remember correctly, the problem here is not about the spinning bar, but about the unability to perform the morph animation on a material button, because loadGradientDrawablefails to get the ShapeDrawable because of the inset.

But maybe I’m wrong, I don’t have to time to test again that for the moment.