添加到列表时出现空引用异常

Question

我有一个应该可以访问数据的项目。 我选择在txt文件中放置数据。 当我尝试将读取的行添加到第一个“名称”列表时，它给了我空引用。 我是初学者，英语不是我的母语。 我希望你能帮助我。

names.txt异常

public class cat extends AppCompatActivity {
GridView gridView;
ArrayList<food> list;
ArrayList<String> names;
List<String> FoodS;
  StringBuilder text = new StringBuilder();
  FoodListAdapter adapter = null;
Context context;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_cat);
          gridView = (GridView) findViewById(R.id.gridView);
          list = new ArrayList<>();
          adapter = new FoodListAdapter(this, R.layout.griditem, list);
          readFile();
          adapter.notifyDataSetChanged();
          gridView.setAdapter(adapter);
      }
  void readFile() {
      try {
         // File file = new File(getExternalFilesDir(null).getPath()+"/names.txt");
          InputStream is = getResources().openRawResource(R.raw.names);
          BufferedReader br = new BufferedReader(new InputStreamReader(is));
          String Line;
          while ((Line = br.readLine()) != "") {
              names.add(Line);
          }
              for (String x : names) {
              try {
                  AssetManager am = context.getAssets();
                  is = am.open(x);
                  br = new BufferedReader(new InputStreamReader(is));
                  while ((Line = br.readLine()) != null) {
                      FoodS.add(Line);
                  }
                  String a = (String) FoodS.get(0);
                  String b = (String) FoodS.get(1);
                  String c = (String) FoodS.get(2);
                  String d = (String) FoodS.get(3);
                  String e = (String) FoodS.get(4);
                  list.add(new food(0, a, b, c, d, e));
                  FoodS.clear();
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
      } catch (Exception e) {
          e.printStackTrace();
      }
      }
}