[Snackbar] Can't change top and bottom padding of snackbar's text view

Description: Setting <item name="android:padding">0dp</item> changes the start and end padding but the top and bottom remain unchanged. Setting android:paddingTop and android:paddingBottom has the same effect.

From the layout inspector

Expected behavior: The top and bottom padding change, similar to start and end.

Source code:

<style name="AppTheme" parent="Theme.MaterialComponents.Light.NoActionBar">
    <item name="snackbarTextViewStyle">@style/AppTheme.Snackbar.TextView</item>
</style>

<style name="AppTheme.Snackbar.TextView" parent="@style/Widget.MaterialComponents.Snackbar.TextView">
    <item name="android:padding">0dp</item>
</style>

Android API version: 29

Material Library version: 1.2.0-alpha05

Device: Android Emulator - Pixel 2

[DanielMartinus]

I just went through the source and found a way of updating the padding of the Snackbar. I’ll explain the steps that I went through, see tl;dr at the end.

Snackbar.java

In Snackbar.java on line167 you can see it inflating one of two layouts: R.layout.mtrl_layout_snackbar_include : R.layout.design_layout_snackbar_include

In those layouts you see almost two similar layouts, just different stylings and references. What they have in common though is the TextView and Button. The TextView is named: android:id=“@+id/snackbar_text”

However this snackbar_text isn’t used anywhere in snackbar.java but after some more investigation I found it’s used in SnackbarContentLayout referenced all over the place, but most importantly on line 163 in snackbar.java.

final SnackbarContentLayout content =
        (SnackbarContentLayout)
            inflater.inflate(
                hasSnackbarContentStyleAttrs(parent.getContext())
                    ? R.layout.mtrl_layout_snackbar_include
                    : R.layout.design_layout_snackbar_include,
                parent,
                false);

SnackbarContentLayout

Going into this SnackbarContentLayout I looked for snackbar_text which is assigned to messageView. Following this messageView you quickly find line124 where it’s doing a condition if the textview contains a single or multilines updating the bottom and top padding.

Following back where updateViewsWithinLayout is called from (line101) you see it’s choosing between a multiLineVPadding or singleLineVPadding.

Following multiLineVPadding you’ll see it assigned on line91

final int multiLineVPadding =
        getResources().getDimensionPixelSize(R.dimen.design_snackbar_padding_vertical_2lines);

Finally looking up design_snackbar_padding_vertical_2lines you’ll see it has 24dp assigned.

Tl;dr

The padding of the Snackbar varies between singleline (14dp) and multiline (24dp). You need to somehow override this. This can be done by overriding this value in your dimens.xml for example.

<dimen name="design_snackbar_padding_vertical_2lines">14dp</dimen>

[hunterstich]

You can set your theme’s snackbarStyle with android:paddingTop and android:paddingBottom to achieve increase the padding.

<style name="AppTheme" parent="Theme.MaterialComponents.DayNight">
    <item name="snackbarStyle">@style/Widget.MyApp.Snackbar</item>
</style>

<style name="Widget.MyApp.Snackbar" parent="@style/Widget.MaterialComponents.Snackbar">
    <item name="android:layout_margin">45dp</item>
    <item name="android:padding">32dp</item>
</style>

Are you trying to remove all top and bottom padding?