Java 将 ArrayList 转换为字符串并返回到 ArrayList? [英] Java convert ArrayList to string and back to ArrayList?

问题描述

我想将一个 ArrayList 保存到 SharedPreferences 所以我需要把它变成一个字符串然后再回来，这就是我正在做的:

I wanted to save an ArrayList to SharedPreferences so I need to turn it into a string and back, this is what I am doing:

// Save to shared preferences
SharedPreferences sharedPref = this.getPreferences(Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = this.getPreferences(Activity.MODE_PRIVATE).edit();
editor.putString("myAppsArr", myAppsArr.toString());
editor.commit();

我可以用 String arrayString = sharedPref.getString("yourKey", null); 检索它，但我不知道如何将 arrayString 转换回 ArrayList.怎么办?

I can retrieve it with String arrayString = sharedPref.getString("yourKey", null); but I don't know how to convert arrayString back into an ArrayList. How can it be done?

我的数组看起来像:

[item1,item2,item3]

推荐答案

您有 2 个选择:

1. 手动解析字符串并重新创建数组列表.这会很乏味.

2. 使用 JSON 库(如 Google 的 Gson 库)将对象存储和检索为 JSON 字符串.这是一个轻量级的库，备受推崇和流行.这将是您需要最少工作的理想解决方案.例如，

1. Manually parse the string and recreate the arraylist. This would be pretty tedious.

2. Use a JSON library like Google's Gson library to store and retrieve objects as JSON strings. This is a lightweight library, well regarded and popular. It would be an ideal solution in your case with minimal work required. e.g.,

// How to store JSON string
Gson gson = new Gson();
// This can be any object. Does not have to be an arraylist.
String json = gson.toJson(myAppsArr);

// How to retrieve your Java object back from the string
Gson gson = new Gson();
DataObject obj = gson.fromJson(arrayString, ArrayList.class);

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