public class JsonAdapter extends BaseAdapter {
   private List<ListMenu> classList;
   private Context context;
   private LayoutInflater inflater;

   public JsonAdapter(Context context,List<ListMenu> classList) {
       this.context = context;
       this.classList=classList;
       inflater = LayoutInflater.from(context);
   }

   public JsonAdapter(Context context) {
       this.context = context;
       inflater = LayoutInflater.from(context);
   }

   public void setData(List<ListMenu> classlist) {
       this.classList = classlist;
   }


   @Override
   public int getCount() {
       return classList.size();
   }

说是在getCount()这里出现空指针，求大神解惑