尝试在导航抽屉中设置自定义字体

Question

我想在导航抽屉中设置一个自定义字体，已经搜索过问题但没有找到任何解决方案......这是我想要设置自定义字体的NavigationDrawerAdapter.java：

我也尝试过NavigationDrawerFragment.java和我的MainActivity.java，但这也没用。因为我可以在所有其他适配器中设置自定义字体，我也尝试在那里进行，但它不起作用...

public class NavigationDrawerAdapter extends ArrayAdapter {
private Object[] array;
private int resource;
private int textViewResourceId;
Activity a;
private Activity activity;


public NavigationDrawerAdapter(Context context, int resource, int textViewResourceId, Object[] objects) {
    super(context, resource, textViewResourceId, objects);
    this.array = objects;
    this.resource = resource;
    this.textViewResourceId = textViewResourceId;
    this.activity = activity;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    View v = convertView;

    if (v == null) {
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(resource, null);
    }

    TextView row = (TextView) v.findViewById(textViewResourceId);
    row.setText((String) array[position]);

    TextView navtext = (TextView) v.findViewById(R.id.navigation_drawer_text);
    Typeface tf = TypefaceUtil.getAndCache(activity, "Lato-Semibold.ttf");
    navtext.setTypeface(tf);


    switch (position) {
        case 0:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_charts, 0, 0, 0);
            break;
        case 1:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_search, 0, 0, 0);
            break;
        case 2:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_my_music, 0, 0, 0);
            break;
        case 3:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_radio, 0, 0, 0);
            break;
        case 4:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_play, 0, 0, 0);
            break;
        case 5:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_listening_local, 0, 0, 0);
            break;
        case 6:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_news, 0, 0, 0);
            break;
        case 7:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_settings, 0, 0, 0);
            break;
        case 8:
            row.setCompoundDrawablesWithIntrinsicBounds(R.drawable.btn_material_about, 0, 0, 0);
            break;
    }

    return row;
}
}