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@Dreamwalker

[Android] Material Button 使うとき、IllegalArgumentException予防。

Posted at 
Caused by: java.lang.IllegalArgumentException: 
This component requires that you specify a valid TextAppearance attribute. 
Update your app theme to inherit from Theme.MaterialComponents (or a descendant).

style で　activity のThemeを変えましょう


<style name="Theme.Custom" parent="Theme.MaterialComponents.NoActionBar">
</style>
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