Android Programming: The Big Nerd Ranch Guide, 4th Edition

Modifying Button Attributes

Earlier you customized the buttons in BeatBox by manually setting a style attribute in the res/layout/list_item_sound.xml file. If you have a more complex app, with buttons throughout many activities or fragments, setting a style attribute on each and every button does not scale well. You can take your theme a step further by defining a style in your theme for every button in your app.

Before adding a button style to your theme, remove the style attribute from list_item_sound.xml.

Listing 21.9  Be gone! We have a better way (res/layout/list_item_sound.xml)

<Button
    style="@style/BeatBoxButton.Strong" android:layout_width="match_parent" android:layout_height="120dp" android:onClick="@{() -> viewModel.onButtonClicked()}" ...