I found a solution. inside the button tag, use

android:backgroundTint="#ccc"

replace #ccc in the above line with hex code for your preferred color. This should solve it.

Add the attribute:

app:backgroundTint="@null"

You can change style from design editor as shown in below image

To resolve the issue. In the xml replace background in "android:background="@android:color/black" with backgroundTint "android:backgroundTint="@android:color/black"

You might be using targetSdkVersion 30

Solution: change the theme.xml style from

<style name="AppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">

to

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

You can use this button

<androidx.appcompat.widget.AppCompatButton>

It's purple because of default background Tint color. You can : change **app:backgroundTint ** instad of android:backgroundColor . In this case your backgroundTint will appear instead of background color

OR

add

app:backgroundTint="@null"

and after that your background color will appear.

OR

You can change the default theme in android manifest . For example :

android:theme="@style/Theme.AppCompat"

or

 android:theme="@style/Theme.AppCompat.NoActionBar"

go to res-values-themes-themes you will find two themes. one is when dark mode is activated. Go and change the one in dark mode. what could be happening is you have a different style for dark mode. I really hope it was easy to understand since english is not my first language

don't use anything else use

<androidx.appcompat.widget.AppCompatButton
<!-- attributes-->
/>

instead of one

<Button
<!--attributes-->
/>

every thing will work nicely.

Happy coding.

Android default color is Purple in the latest Android Studio version. To change the color of the Button, you need to add a single line of code in the XML i.e.

app:backgroundTint="@color/red"

That's all!

It's really easy. You should create a shape in XML. Set background to that shape then set background with that XML.

I had same problem, I tried almost everything and nothing worked! Seems like something has changed in Android Studio 4.1.1? idk.

[MY SOLUTION] So I used TextView instead of Button and set custom background and it worked for me :/ Hope this helps!

it worked well with the update on 'com.google.android.material:material:1.2.0-alpha06'

or

do it programmatically : myButton.background = ContextCompat.getDrawable(requireContext(), R.drawable.my_background)

both options, you'll need to set app:backgroundTint property as null

app:backgroundTint="@null"

check the next link: https://github.com/material-components/material-components-android/issues/889