我通过设置typeface = Typeface.DEFAULT_BOLD使文本加粗。它起作用了，但是我的字体（Monserrat）变成了默认字体（Roboto）。我怎样才能在不影响字体的情况下更改加粗呢？
设置字体的功能：

fun setTabTypeface(tab: TabLayout.Tab, typeface: Typeface?) {
    for (i in 0 until tab.view.childCount) {
        val tabViewChild: View = tab.view.getChildAt(i)
        if (tabViewChild is TextView) tabViewChild.typeface = typeface
    }
}

我怎么称呼它：

fun TabLayout.onTabSelectedListener(
    onFollowClickListener: ((String) -> Unit),
) {
    this.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
        override fun onTabSelected(tab: TabLayout.Tab) {
            setTabTypeface(tab, Typeface.DEFAULT_BOLD)
        }

        override fun onTabUnselected(tab: TabLayout.Tab?) {
            tab?.let { setTabTypeface(tab, Typeface.DEFAULT) }
        }

        override fun onTabReselected(tab: TabLayout.Tab?) {
        }
    })
}

我仅在此处指定字体：

<resources>
    <!-- Base application theme. -->
    <style name="Theme.MyTheme" parent="Theme.MaterialComponents.Light.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">@color/status_bar_white</item>
        <item name="android:windowLightStatusBar">true</item>
        <item name="android:fontFamily">@font/montserrat</item>
        <!-- Customize your theme here. -->
        <item name="fontFamily">@font/montserrat</item>
    </style>

</resources>