Custom TextView with custom Font

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_login"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    android:descendantFocusability="beforeDescendants"
    android:focusableInTouchMode="true"
    android:background="@color/colorGreyBar"
   >


  <com.helpers.custom_ui.CustomFontTextView
                android:id="@+id/tvTextView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:visibility="gone"
                android:textColor="@color/colorButtonRed"
                android:text="Some text"
                android:textSize="8sp"
                />
</android.support.design.widget.CoordinatorLayout>

RegularProximaTextView.java

import android.content.Context;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;


public class CustomFontTextView extends TextView {
    public static Typeface FONT_NAME;


    public RegularProximaTextView(Context context) {
        super(context);
        if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
        this.setTypeface(FONT_NAME);
    }
    public RegularProximaTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
        this.setTypeface(FONT_NAME);
    }
    public RegularProximaTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        if(FONT_NAME == null) FONT_NAME = Typeface.createFromAsset(context.getAssets(), "fonts/Mark Simonson - Proxima Nova Regular.otf");
        this.setTypeface(FONT_NAME);
    }
}