OkHttpClient添加离线缓存

最新推荐文章于 2024-05-08 18:51:07 发布

转载最新推荐文章于 2024-05-08 18:51:07 发布 · 302 阅读

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CC 4.0 BY-SA版权

原文链接：https://juejin.im/post/5aac835af265da238e0d8268

本文介绍了一种利用OkHttp实现智能缓存的方案，包括创建自定义拦截器来控制缓存行为、设置缓存文件属性及整合日志记录等步骤。在网络连接正常时，该方案倾向于使用最新数据；在网络不佳时，则启用离线缓存。

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1.创建拦截器，用于判断什么时候读取缓存

Interceptor headerInterceptor = new Interceptor() {

            @Override
            public Response intercept(Chain chain) throws IOException {
                
                CacheControl.Builder cacheBuilder = new CacheControl.Builder();
                cacheBuilder.maxAge(0, TimeUnit.SECONDS);
                cacheBuilder.maxStale(365,TimeUnit.DAYS);
                CacheControl cacheControl = cacheBuilder.build();
                Request request = chain.request();
                if(!NetworkUtils.isConnected()){
                    request = request.newBuilder()
                            .cacheControl(cacheControl)
                            .build();
                }
                Response originalResponse = chain.proceed(request);
                if (NetworkUtils.isConnected()) {
                    int maxAge = 0; // read from cache
                    return originalResponse.newBuilder()
                            .removeHeader("Pragma")
                            .header("Cache-Control", "public ,max-age=" + maxAge)
                            .build();
                } else {
                    int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
                    return originalResponse.newBuilder()
                            .removeHeader("Pragma")
                            .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                            .build();
                }
            }
        };
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2.设定缓存文件的属性

        File cacheFile = new File(MyApp.getInstance().getContext().getCacheDir(), "cache");
        Cache cache = new Cache(cacheFile, 1024 * 1024 * 10); //10Mb
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3.添加log打印（看需求）

 HttpLoggingInterceptor logInterceptor = new HttpLoggingInterceptor();
        logInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
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4.将以上的配置添加到OkHttpClient即可

OkHttpClient client = new OkHttpClient.Builder()
                .addInterceptor(headerInterceptor)
                .addInterceptor(logInterceptor)
                .cache(cache)
                .build();
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转载于:https://juejin.im/post/5aac835af265da238e0d8268