Why doesn't the button color change in Android Studio?

Question

Android

I'm trying to change the color of the button, it doesn't work. Here is the code

<Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/black"
            android:text="GO"
            android:layout_margin="2dp"/>

Here is a screenshot

Answer 1

a) try to do a rebuild project (studio preview can be buggy)
b) see what happens if you run it on a real or virtual device
c) make sure it @color/black's really black

Answer 2

need another field to "color"

Answer 3

Try changing the type of Baton. It works for me like this:

<androidx.appcompat.widget.AppCompatButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="test"
        android:background="@color/black"/>