attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="BlurTextView">
        <attr name="blurRadius" format="dimension" />
        <attr name="blurType">
            <flag name="normal" value="0" />
            <flag name="solid" value="1" />
            <flag name="outer" value="2" />
            <flag name="inner" value="3" />
        </attr>
    </declare-styleable>
</resources>

BlurTextView.kt

import android.content.Context
import android.graphics.BlurMaskFilter
import android.util.AttributeSet
import com.google.android.material.textview.MaterialTextView
import com.gooo_group.gooo.R

class BlurTextView(context: Context, attrs: AttributeSet) : MaterialTextView(context, attrs) {

    init {
        val typedArray = context.theme.obtainStyledAttributes(
            attrs, R.styleable.BlurTextView, 0, 0
        )

        val blurRadius = typedArray.getDimension(R.styleable.BlurTextView_blurRadius, 0f)
        val filter = when (typedArray.getInt(R.styleable.BlurTextView_blurType, 0)) {
            0 -> BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.NORMAL)
            1 -> BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.SOLID)
            2 -> BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.OUTER)
            3 -> BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.INNER)
            else -> BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.NORMAL)
        }
        paint.maskFilter = filter
    }
}

fragment_blur_text.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.android.example.view.BlurTextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:blurRadius="4dp"
        app:blurType="solid" />
</FrameLayout>