如何保存列表＆LT;对象＆gt;为共享preferences？ [英] How to save List<Object> to SharedPreferences?

问题描述

我的产品，这是我从web服务检索列表中，当应用程序被打开一次，应用程序会从Web服务产品清单。我要救这个名单共享preferences。

I have a list of products, which i retrieve from webservice, when app is opened for first time, app gets product list from webservice. I want to save this list to shared preferences.

    List<Product> medicineList = new ArrayList<Product>();

其中，产品类​​：

where Product class is:

public class Product {
    public final String productName;
    public final String price;
    public final String content;
    public final String imageUrl;

    public Product(String productName, String price, String content, String imageUrl) {
        this.productName = productName;
        this.price = price;
        this.content = content;
        this.imageUrl = imageUrl;
    }
}

我怎么能拯救这个名单不是从web服务每次请求？

how i can save this List not requesting from webservice each time?

推荐答案

它只能使用基本类型，因为preference保持在内存中。但是你可以用的是序列化的类型与GSON成JSON并把串入preferences：

It only possible to use primitive types because preference keep in memory. But what you can use is serialize your types with Gson into json and put string into preferences:

    private static SharedPreferences sharedPreferences = context.getSharedPreferences(STORE_FILE_NAME, Context.MODE_PRIVATE);

    private static SharedPreferences.Editor editor = sharedPreferences.edit();

    public <T> void setList(String key, List<T> list)
        {
            Gson gson = new Gson();
            String json = gson.toJson(list);

            set(key, json);
        }
    public static void set(String key, String value)
        {
            editor.putString(key, value);
            editor.commit();
        }

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