Style SnackBar in theme app

With the Material Components Library you can globally change the snackbar style in your app theme:

<style name="AppTheme" parent="Theme.MaterialComponents.*">
    <!-- Style to use for Snackbars in this theme. -->
    <item name="snackbarStyle">@style/Widget.MaterialComponents.Snackbar</item>
    <!-- Style to use for action button within a Snackbar in this theme. -->
    <item name="snackbarButtonStyle">@style/Widget.MaterialComponents.Button.TextButton.Snackbar</item>
    <!-- Style to use for message text within a Snackbar in this theme. -->
    <item name="snackbarTextViewStyle">@style/Widget.MaterialComponents.Snackbar.TextView</item>
    ....
</style>

Note:

• snackbarStyle and snackbarButtonStyle require the version 1.1.0
• snackbarTextViewStyle requires the version 1.2.0.

For example:

  <style name="snackbar_style" parent="@style/Widget.MaterialComponents.Snackbar">
    <item name="android:layout_margin">32dp</item>
  </style>

  <style name="snackbar_button" parent="@style/Widget.MaterialComponents.Button.TextButton.Snackbar">
      <item name="backgroundTint">@color/secondaryLightColor</item>
      <item name="android:textColor">@color/primaryDarkColor</item>
  </style>

  <style name="snackbar_text" parent="@style/Widget.MaterialComponents.Snackbar.TextView">
    <item name="android:textColor">@color/secondaryLightColor</item>
  </style>

It is just an example how to change also the parent style for the action button. You can use for example a standard Widget.MaterialComponents.Button:

  <style name="snackbar_button" parent="@style/Widget.MaterialComponents.Button">
      <item name="backgroundTint">@color/secondaryLightColor</item>
      <item name="android:textColor">@color/primaryDarkColor</item>
  </style>

To change the background color of the SnackBar you can use:

<style name="snackbar_style" parent="@style/Widget.MaterialComponents.Snackbar">
    <!-- using backgroundTint the alpha layer is ignored -->
    <item name="backgroundTint">@color/....</item>
</style>

Or if you prefer:

   <style name="MySnackbar" parent="@style/Widget.MaterialComponents.Snackbar">
        <item name="materialThemeOverlay">@style/snackbar_overlay</item>
        <!-- If you want to avoid the alpha level for the color that is overlaid on top of the background color-->
        <item name="backgroundOverlayColorAlpha">1.0</item>
    </style>
    <style name="snackbar_overlay">
        <item name="colorOnSurface">....</item>
    </style>