[Snackbar] Setting LayoutParams for SnackbarLayout doesn't work

Description:

There is no effect when trying to set LayoutParams for the SnackbarLayout (i.e. adding some margins). I tried to add margins to the Snackbar because I wanted it not to stick to the bottom edges of the screen. Instead, I wanted it to float just like shown in the Material design guidelines.

This bug does not occur on Library version 1.0.0. I’ve reproduced this issue with version 1.1.0 and also with the latest alpha (1.2.0-alpha05).

Expected behavior:

Actual behavior:

Source code:

Snackbar snackbar = Snackbar.make(getView(), "Test", Snackbar.LENGTH_LONG);
Snackbar.SnackbarLayout snackbarLayout = (Snackbar.SnackbarLayout) snackbar.getView();
CoordinatorLayout.LayoutParams layoutParams = (CoordinatorLayout.LayoutParams) 
snackbarLayout.getLayoutParams();
layoutParams.setMargins(32, 0, 32, 32);
snackbarLayout.setLayoutParams(layoutParams);
snackbar.show();

Android API version: 29

Material Library version: 1.1.0 and 1.2.0-alpha05

Device: Samsung Galaxy S10 and Android Emulator (Pixel 2 API 29)

[ricknout]

Here is a way to achieve this using styles (for example, just a custom bottom margin):

<style name="Theme.App" parent="Theme.MaterialComponents.Light.NoActionBar">
    ...
    <item name="snackbarStyle">@style/Widget.App.Snackbar</item>
</style>

<style name="Widget.App.Snackbar" parent="Widget.MaterialComponents.Snackbar">
    <item name="android:layout_margin">@null</item>
    <!-- Use default Snackbar margins for top/left/right -->
    <item name="android:layout_marginTop">@dimen/mtrl_snackbar_margin</item>
    <item name="android:layout_marginLeft">@dimen/mtrl_snackbar_margin</item>
    <item name="android:layout_marginRight">@dimen/mtrl_snackbar_margin</item>
    <!-- Custom bottom margin, this could work for top/left/right too -->
    <item name="android:layout_marginBottom">100dp</item>
</style>

[jairrab]

Edited: Can confirm this issue. The last version where the margin behavior was working properly was with version 1.1.0-alpha10 1.1.0-beta01. Margin Issue first started showing up on 1.1.0-beta02.

Scanning through the commits on 1.1.0-beta02, this commit on 75e20b78fadf1f89d43ee71d9365e12d4d8f8213 seems to make changes to margin calculations changes.