Android 如何保存实体类

//保存实体类
sharedPreferences = getSharedPreferences("housingItem",MODE_PRIVATE);
SharedPreferences.Editor edit = sharedPreferences.edit();
edit.putString("housingItem",new Gson().toJson(housingItem));
edit.commit();

//获取实体类

SharedPreferences housingItem1 = getSharedPreferences("housingItem", 0);
String housingItem2 = housingItem1.getString("housingItem", "");
Gson gson=new Gson();
Housing housingItem = gson.fromJson(housingItem2, new TypeToken<Housing>(){}.getType());
housingList.add(housingItem);

Housing是集合的类型，如下图

housingList是集合 

List<Housing> housingList = new ArrayList<>();

重点是借助Gson。通过这件事我发现要活学活用。

sharedPreferences  这个好像只能保存一条数据，如果保存的不是账号密码这样的只有一条的东西，还是换数据库吧