Change Font type of Tab in Tablayout

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="DEFAULT FONT"
        android:textSize="15dp" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tabOne"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="6dp"
        android:background="@color/colorAccent"
        app:tabSelectedTextColor="@android:color/black"
        app:tabTextColor="@android:color/white" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="CUSTOM FONT"
        android:textSize="15dp" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tabTwo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="6dp"
        android:background="@color/colorAccent"
        app:tabSelectedTextColor="@android:color/black"
        app:tabTextColor="@android:color/white" />
</LinearLayout>

build.gradle(Module:app)

//Add Support design dependency for Tablayout
...
  compile 'com.android.support:design:25.3.1'
..

MainActivity.java

import android.graphics.Typeface;
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TabLayout mCustomFontTab;
    private TabLayout mDefaultFontTab;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mDefaultFontTab = (TabLayout) findViewById(R.id.tabOne);
        mCustomFontTab = (TabLayout) findViewById(R.id.tabTwo);

        //Adding Tab to first Tab Layout
        mDefaultFontTab.addTab(mDefaultFontTab.newTab().setText("ONE"));
        mDefaultFontTab.addTab(mDefaultFontTab.newTab().setText("TWO"));
        mDefaultFontTab.addTab(mDefaultFontTab.newTab().setText("THREE"));

        //Adding Tab to second Tab Layout
        mCustomFontTab.addTab(mCustomFontTab.newTab().setText("ONE"));
        mCustomFontTab.addTab(mCustomFontTab.newTab().setText("TWO"));
        mCustomFontTab.addTab(mCustomFontTab.newTab().setText("THREE"));

        //call this method to change the font of second tab layout
        setCustomFont();
    }

    public void setCustomFont() {

        ViewGroup vg = (ViewGroup) mCustomFontTab.getChildAt(0);
        int tabsCount = vg.getChildCount();

        for (int j = 0; j < tabsCount; j++) {
            ViewGroup vgTab = (ViewGroup) vg.getChildAt(j);

            int tabChildsCount = vgTab.getChildCount();

            for (int i = 0; i < tabChildsCount; i++) {
                View tabViewChild = vgTab.getChildAt(i);
                if (tabViewChild instanceof TextView) {
                    //Put your font in assests folder
                    //assign name of the font here (Must be case sensitive)
                    ((TextView) tabViewChild).setTypeface(Typeface.createFromAsset(getAssets(), "Nosifer-Regular.ttf"));
                }
            }
        }
    }
}