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You can define a font family and set a font weight for specific font and ally the style to the TextView with specific font family type. Check this article https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml

Not really. How can you apply weight=200 (thin) at callsite?

One way is to apply style, there you have weight parameter defined or you can define font weight from compat library... It was

app:fontWeight

or something like this.

you mean textFontWeight? https://developer.android.com/reference/android/widget/TextView.html#attr_android:textFontWeight

ok, you right. I did accomplished it differently using styles.

<style name="MyFontLight">
        <item name="fontFamily">@font/arima_madurai_light</item>
    </style>
    <style name="MyFontLightItalic">
        <item name="fontFamily">@font/arima_madurai_light</item>
        <item name="android:textStyle">italic</item>
    </style>
    <style name="MyFontMedium">
        <item name="fontFamily">@font/arima_madurai_medium</item>
    </style>
    <style name="MyFontMediumItalic">
        <item name="fontFamily">@font/arima_madurai_medium</item>
        <item name="android:textStyle">italic</item>
    </style>
    <style name="MyFontBold">
        <item name="fontFamily">@font/arima_madurai_bold</item>
    </style>
    <style name="MyFontBoldItalic">
        <item name="fontFamily">@font/arima_madurai_bold</item>
        <item name="android:textStyle">italic</item>
    </style>
    <style name="MyFontExtraBold">
        <item name="fontFamily">@font/arima_madurai_extrabold</item>
    </style>
    <style name="MyFontExtraBoldItalic">
        <item name="fontFamily">@font/arima_madurai_extrabold</item>
        <item name="android:textStyle">italic</item>
    </style>

and usage is something following

<TextView
            style="@style/MyFontLight"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

    <TextView
            style="@style/MyFontLightItalic"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

    <TextView
            style="@style/MyFontMedium"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

    <TextView
            style="@style/MyFontMediumItalic"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

    <TextView
            style="@style/MyFontBold"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

    <TextView
            style="@style/MyFontExtraBold"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/custom_font" />

yea, I also wanted styles, but my issue was that it needs to a attr, and you cannot inteherit thos if you need a style which inherits from your MyFontBold for example

I'm not sure about your exact need, but if you just need to override some fonts you can use

ThemeOverlay

theme for this and define fonts via it. In this case you will be able to use regular

style="@style/***"

for any other adjustments you need.