The textView shoud be instanced, I don't know why it says NullPointerException at textView.setText("test");
public View getView(int position,  View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rowView = inflater.inflate(R.layout.list_navdrawer, parent, false);
    TextView textView = (TextView) rowView.getTag(android.R.id.text1);
    textView.setText("test");
    if (position == mSelectedItem) {
        textView.setTextColor(getContext().getResources().getColor(android.R.color. holo_blue_dark));
        textView.setTypeface(Typeface.DEFAULT_BOLD);
    } else {
        textView.setTextColor(getContext().getResources().getColor(android.R.color.white));
    }
    return textView;
}
 
    