将 ArrayList 转换为 String 以存储在共享首选项中

Question

我有多个值的 ArrayList。我想将此 ArrayList 转换为 String 以保存在 sharedPreferences 中，然后我想检索 String 并将其转换回 ArrayList

请告诉我怎么做？（或任何其他存储和检索 ArrayList 的想法）

Answer 1

您可以使用 Google 的 GSON。

Gson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.

http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/Gson.html

https://code.google.com/p/google-gson/

你明白了：

Store: Convert Object to JSON String -> Save string

Retrieve: Get string -> Convert from JSON to Object

Answer 2

将数组列表转换为字符串：

String str = "";

for (String s : arraylist)
{
    str += s + ",";
}

将字符串保存到共享首选项中：

PreferenceManager.getDefaultSharedPreferences(context).edit().putString("mystr", str).commit();

从共享首选项中获取字符串：

String str =    PreferenceManager.getDefaultSharedPreferences(context).getString("mystr", "defaultStringIfNothingFound");

将字符串转换为数组列表：

List<String> arraylist = new ArrayList<String>(Arrays.asList(str.split(",")));

将 ArrayList 转换为 String 以存储在共享首选项中

Converting ArrayList to String to store in Shared Preferences

java

android

string

arraylist

sharedpreferences