Material design components button global theme overriding broken

问题

I want to simply apply styling to all buttons on a theme level like this

<style name="BaseTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
     ...    
    <item name="buttonStyle">@style/DefaultButton</item>
</style>

<style name="DefaultButton" parent="Widget.MaterialComponents.Button">
    <item name="android:textColor">@color/whatever</item>
</style>

<Button
    android:id="@+id/addChannelButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|center_horizontal"
    android:layout_margin="16dp"
    android:text="Add room" />

Why doesnt this work? It would in appcompat

// If I use Theme.MaterialComponents.Light.NoActionBar.Bridge, then it works

回答1:

You should be setting materialButtonStyle instead of buttonStyle in your theme.

回答2:

Use a Theme.MaterialComponents theme defining the materialButtonStyle attribute.

  <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.MaterialComponents.Light">
    ....

    <item name="materialButtonStyle">@style/MyButtonTheme</item>
  </style>

In this way you can customize the theme of all the buttons in your app.
Also starting from version 1.1.0 of the material library you can override the theme attributes from the default style using the materialThemeOverlay attribute.

Something like:

  <style name="MyButtonTheme" parent="Widget.MaterialComponents.Button">
    <item name="materialThemeOverlay">@style/ButtonStyleTextColor</item>
  </style>

  <style name="ButtonStyleTextColor">
    <!-- For filled buttons, your theme's colorPrimary provides the default background color of the component, and -->
    <!--the text color is colorOnPrimary -->
    <item name="colorOnPrimary">@color/my_color</item>

  </style>

Currently it requires version 1.1.0 of material components for android library.

回答3:

Can you try with v1.0.0-alpha06? There has been some progress since v1.0.0 which may have addressed what you're seeing.

1.1.0-alpha02

Shape Theming: FloatingActionButton, MaterialButton, Chip, MaterialCardView, BottomSheet, & TextInputLayout updated to use the new Material shape system