Just follow below steps which will help to you. and Custom adapter contains custom fonts for textview. Follow below steps.
1.Create Activity i.e MainActivity.java contains
package com.example.test;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView = (ListView) findViewById(R.id.listview);
        List<City> cities = new ArrayList<City>();
        for (int i = 1; i <= 10; i++) {
            cities.add(new City(""+i, "City Name "+i));
        }
        CityAdapter adapter = new CityAdapter(getBaseContext(), cities);
        listView.setAdapter(adapter);
    }
}
2.layout file activity_main.xml with
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >
    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>
3.Now Create Class For City i.e City.java
package com.example.test;
public class City {
    private String cityId;
    private String cityName;
    /**
     * @param cityId
     * @param cityName
     */
    public City(String cityId, String cityName) {
        super();
        this.cityId = cityId;
        this.cityName = cityName;
    }
    public String getCityId() {
        return cityId;
    }
    public void setCityId(String cityId) {
        this.cityId = cityId;
    }
    public String getCityName() {
        return cityName;
    }
    public void setCityName(String cityName) {
        this.cityName = cityName;
    }
    @Override
    public String toString() {
        return cityName;
    }
}
4.Need to create adapter for city and which contains custom fonts CityAdapter.java
package com.example.test;
import java.util.List;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class CityAdapter extends ArrayAdapter<City> {
    private Context mContext;
    private List<City> cities;
    public CityAdapter(Context context,
            List<City> list) {
        super(context, R.layout.city_adapter, list);
        this.mContext = context;
        this.cities = list;
    }
    static class ViewHolder {
        private TextView textView;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO getview
        ViewHolder viewHolder;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) mContext
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.city_adapter, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.textView = (TextView) convertView.findViewById(R.id.textview);
            viewHolder.textView.setTypeface(Typeface.createFromAsset(getContext().getAssets(), "fonts/roboto_bold.ttf"));
            convertView.setTag(viewHolder);
        }else{
            viewHolder = (ViewHolder) convertView.getTag();
        }
        City city = cities.get(position);
        if (city != null) {
            viewHolder.textView.setText(city.getCityName());
        }
        return convertView;
    }   
}
5.with lyout for adapter city_adapter.xml below
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dip" >
    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_margin="10dip" />
</RelativeLayout>
You have to place your font in assets/fonts/xyz.ttf for my case font is roboto_bold.ttf which is at assets/fonts/roboto_bold.ttf and working fine. Just add your city object in list.