Can't change `android:textColor` for a button using a theme

Issue

Hello I have a simple android application in which I have a button. This is the default theme of my application: themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.BaseAppTheme" parent="Theme.MaterialComponents.DayNight.NoActionBar">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
    </style>
    <style name="Theme.WalkTest" parent="Theme.BaseAppTheme">
        <item name="android:textColor">@android:color/black</item>
    </style>
</resources>

In a separate file, button.xml I've defined the theme for my button:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme.WalkTest.ButtonSecondary" parent="Theme.WalkTest">
        <item name="android:backgroundTint">@android:color/holo_green_dark</item>
        <item name="android:textColor">@android:color/black</item>
    </style>
</resources>

and here is the button I have in my fragment: fragment_buildings.xml (I'm using navigation).

        <Button
            android:id="@+id/create_building_button"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="10dp"
            android:drawableLeft="@drawable/ic_add"
            android:paddingLeft="15dp"
            android:paddingTop="20dp"
            android:paddingRight="15dp"
            android:paddingBottom="20dp"
            android:text="@string/new_building"
            android:textAlignment="textStart"
            android:theme="@style/Theme.WalkTest.ButtonSecondary"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/toolbar" />

Here is android studio's preview:

I can see that the background change is working, however the textColor doesn't seem to change?
I can use the attributes on the button element to change its colour, but I wanna have reusable styles.

This is my Android Studio version:

Android Studio 4.1
Build #AI-201.8743.12.41.6858069, built on September 23, 2020
Runtime version: 1.8.0_242-release-1644-b3-6222593 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.15.7
GC: ParNew, ConcurrentMarkSweep
Memory: 2014M
Cores: 4
Registry: ide.new.welcome.screen.force=true
Non-Bundled Plugins: IdeaVIM, org.jetbrains.kotlin

Solution

use

style = "@style/Theme.WalkTest.ButtonSecondary"

instead of

android:theme="@style/Theme.WalkTest.ButtonSecondary"

Answered By - DevKazonovic