android–Retrofit响应缓存

概述这里有很多关于Retrofit缓存的复杂答案,但似乎都没有帮助我.如何缓存来自Retrofit响应的代码响应？我的应用程序可以正常下载下面的JSON,但我需要为它做一个缓存,我从来没有在Android上进行缓存.我需要离线打开应用程序并从我的Retrofit调用中获取结果,就好像我在线一样.public

这里有很多关于Retrofit缓存的复杂答案,但似乎都没有帮助我.

如何缓存来自Retrofit响应的代码响应？

我的应用程序可以正常下载下面的JSON,但我需要为它做一个缓存,我从来没有在Android上进行缓存.

我需要离线打开应用程序并从我的Retrofit调用中获取结果,就好像我在线一样.

public class apiclient {public static final String BASE_URL = "https://raw.githubusercontent.com/";private static Retrofit retrofit = null;public static Retrofit getClIEnt() {    if (retrofit==null) {        OkhttpClIEnt.Builder httpClIEnt = new OkhttpClIEnt.Builder();        httpClIEnt.addInterceptor(new Interceptor() {            @OverrIDe            public Response intercept(Interceptor.Chain chain) throws IOException {                Request original = chain.request();                Request request = original.newBuilder()                        .method(original.method(), original.body())                        .build();                return chain.proceed(request);            }        });        OkhttpClIEnt clIEnt = httpClIEnt.build();        retrofit = new Retrofit.Builder()                .baseUrl(BASE_URL)                .addConverterFactory(GsonConverterFactory.create())                .clIEnt(clIEnt)                .build();    }    return retrofit;}}

Json响应非常简单：

{     "fruits":[        {           "name":"Apple",         "image":"https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Red_Apple.jpg/265px-Red_Apple.jpg",         "price":35      },      {           "name":"Banana",         "image":"https://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Bananas_white_background_DS.jpg/320px-Bananas_white_background_DS.jpg",         "price":12      },      {           "name":"Grapes",         "image":"https://upload.wikimedia.org/wikipedia/commons/thumb/b/bb/table_grapes_on_white.jpg/320px-table_grapes_on_white.jpg",         "price":45      },      {           "name":"Pineapple",         "image":"https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Pineapple_and_cross_section.jpg/286px-Pineapple_and_cross_section.jpg",         "price":200      },      {           "name":"cherry",         "image":"http://www.desicomments.com/wp-content/uploads/2017/05/Cherry-Image-600x570.jpg",         "price":13      },      {           "name":"clementine",         "image":"http://www.icecreamnation.org/wp-content/uploads/2013/04/Clementine_orange.jpg",         "price":12.4      },      {           "name":"olive",         "image":"https://www.homenaturalcures.com/wp-content/uploads/olive.jpg",         "price":9.5      },      {           "name":"tomato",         "image":"http://cdn2.stylecraze.com/wp-content/uploads/2013/05/tomato-hair-benefits1.jpg",         "price":8.75      },      {           "name":"huckleBerry",         "image":"http://farm3.static.flickr.com/2131/2082287810_47339fc93e.jpg",         "price":11.75      },      {           "name":"papaya",         "image":"http://media.mercola.com/assets/images/foodfacts/papaya-nutrition-facts.jpg",         "price":2.75      },      {           "name":"lime",         "image":"https://www.florihana.com/images/storIEs/virtuemart/product/FLE019%20-%20liME.jpg",         "price":5.75      },      {           "name":"pear",         "image":"https://www.organicfacts.net/wp-content/uploads/pear.jpg",         "price":4.75      }   ]}

解决方法:

假设服务器遵循Cache-Control / If-ModifIEd-Since标头,那么您所要做的就是创建一个Cache对象并将其设置为OkhttpClIEnt.改造将照顾其余部分.

    int cacheSize = 10 * 1024 * 1024; // 10 MB      Cache cache = new Cache(getCacheDir(), cacheSize);    OkhttpClIEnt okhttpClIEnt = new OkhttpClIEnt.Builder()              .cache(cache)            .build();    Retrofit.Builder builder = new Retrofit.Builder()              .baseUrl("http://10.0.2.2:3000/")            .clIEnt(okhttpClIEnt)            .addConverterFactory(GsonConverterFactory.create());    Retrofit retrofit = builder.build();

资料来源：futurestud.io

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