如何在RecyclerView中为TextView设置自定义字体？

我正在使用RecyclerView来填充来自云的数据。但是看起来，为a设置自定义字体TextView并不容易，因为它位于视图内部。传统方式，这是我尝试的方式：

TextView tx = (TextView)findViewById(R.id.person_age);

    Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/Dancing Script.ttf");

    tx.setTypeface(custom_font);

但是在这里，它使应用程序崩溃，因此，为了寻求修复，这是Main Activiy的代码：

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Parse.initialize(this, "app-id", "clientkey");
    setContentView(R.layout.activity_big_board);
    initializeData();
    TextView tx = (TextView)findViewById(R.id.person_age);

    Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/Dancing Script.ttf");

    tx.setTypeface(custom_font);
    adapter = new RVAdapter(persons);


    rv=(RecyclerView)findViewById(R.id.rv);

    LinearLayoutManager llm = new LinearLayoutManager(this);
    rv.setLayoutManager(llm);
    rv.setHasFixedSize(true);


    initializeAdapter();

}

private void initializeData(){
    persons = new ArrayList<>();


    ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("BigBoard");
    query.findInBackground(new FindCallback<ParseObject>() {
        public void done(List<ParseObject> credentialList, ParseException e) {
            if (e == null) {
                for(int i=0;i<credentialList.size();i++)
                {
                    a=credentialList.get(i).getString("Location");
                    b=credentialList.get(i).getString("Feed");
                    persons.add(new Person(a,b));



                    Log.d("OUT", "So the Val::------> " +a +b);


                }
            } else {
                Log.d("score", "Error: " + e.getMessage());
            }

            adapter.notifyDataSetChanged();
        }
    });


}

private void initializeAdapter(){

    rv.setAdapter(adapter);
}

这是Adapter类的代码：

public class RVAdapter extends RecyclerView.Adapter<RVAdapter.PersonViewHolder> {

public static class PersonViewHolder extends RecyclerView.ViewHolder {

    CardView cv;
    TextView personName;
    TextView personAge;
    //ImageView personPhoto;

    PersonViewHolder(View itemView) {
        super(itemView);
        cv = (CardView)itemView.findViewById(R.id.cv);
        personName = (TextView)itemView.findViewById(R.id.person_name);
        personAge = (TextView)itemView.findViewById(R.id.person_age);
        //personPhoto = (ImageView)itemView.findViewById(R.id.person_photo);
    }
}

List<Person> persons;

RVAdapter(List<Person> persons){
    this.persons = persons;
}

@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
    super.onAttachedToRecyclerView(recyclerView);
}

@Override
public PersonViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
    View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item, viewGroup, false);
    PersonViewHolder pvh = new PersonViewHolder(v);
    return pvh;
}

@Override
public void onBindViewHolder(PersonViewHolder personViewHolder, int i) {
    personViewHolder.personName.setText(persons.get(i).name);
    personViewHolder.personAge.setText(persons.get(i).surname);
   // personViewHolder.personPhoto.setImageResource(persons.get(i).photoId);
}

@Override
public int getItemCount()
{
    if(persons!=null)
    {
        return persons.size();
    }
    else
    {
        return 0;
    }
}

}

那么，在不导致UI线程出现任何问题的情况下执行此操作的最佳方法是什么？谢谢，