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Good! Using app:cornerRadius ? I use this way and it works from api 21 to 28 (tested in the app in question)
<Button
android:id="@+id/btnEntrar"
android:layout_width="280dp"
android:layout_height="wrap_content"
android:padding="12dp"
android:text="@string/entrar"
android:backgroundTint="@color/colorOrange"
android:background="@color/colorOrange"
android:textColor="@color/colorWhite"
app:cornerRadius="20dp"
style="@style/Widget.AppCompat.Button.Colored"
android:theme="@style/AppTheme.Button"/>
Good morning. You need to include the code responsible for this interaction, just looking at it won’t be possible to help you.
– Ivan Silva