存储自定义对象的数组列表 [英] Store Arraylist of custom objects
本文介绍了存储自定义对象的数组列表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我已经在共享首选项中保存了自定义对象的ArrayList,如下所示:
I have saved ArrayList of custom objects in the shared preferences like this:
SharedPreferences prefs = context.getSharedPreferences("prefName", Context.MODE_PRIVATE);
Editor editor = prefs.edit();
editor.putStringSet("myList", new Gson().toJson(arraylist).toString());
editor.apply();
这样做,一旦保存了值,但是当我退出应用程序并重新启动并尝试保存新值时,旧值就消失了.
知道如何保存旧值并附加新值吗?
我想将所有值保存在同一数组中,并保存数组以在每次加载应用程序时显示值.
By doing this, once values are saved but when i exit from the app and relaunch and try to save new values then the old values are gone.
Any idea how can i save old values and append new ones?
I want to keep all values in the same array and keep array saved to show values every time when the app loads.
推荐答案
从prefName
读取myList
,将arraylist
附加到首选项中已保存的内容,再将myList
写回首选项.
Read myList
from prefName
, append arraylist
to what was already saved in the preferences, write back myList
to preferences.
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