对自定义对象的数组列表存储 [英] Store Arraylist of cutom objects

问题描述

我在共享preferences像这样保存的自定义对象的ArrayList

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();  

通过从应用程序这样做，一旦价值被保存，但是当我退出并重启并尝试保存新的值，然后将旧值都没有了。结果
任何想法我怎么能保存旧的值并追加新的结果？
我想保留的所有值在同一阵列中，并保持保存值显示每次阵列时，应用程序加载。

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 everytime when the app loads.

推荐答案

读 myList中从 prefName ，追加的ArrayList 什么是已经保存在preferences，回写 myList中来preferences。

Read myList from prefName, append arraylist to what was already saved in the preferences, write back myList to preferences.

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