MainActivity.java

package com.tutosandroidfrance.customfont;

import android.graphics.Typeface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

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

        TextView textView1 = (TextView) findViewById(R.id.text1);
        TextView textView2 = (TextView) findViewById(R.id.text2);
        TextView textView3 = (TextView) findViewById(R.id.text3);

        setFont(textView2,"Roboto-Light.ttf");
        setFont(textView3,"Roboto-Black.ttf");
    }

    public void setFont(TextView textView, String fontName) {
        if(fontName != null){
            try {
                Typeface typeface = Typeface.createFromAsset(getAssets(), "fonts/" + fontName);
                textView.setTypeface(typeface);
            } catch (Exception e) {
                Log.e("FONT", fontName + " not found", e);
            }
        }
    }
}