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RetrofitCache让retrofit2+okhttp3+rxjava 配置缓存如此简单。通过注解配置，可以针对每一个接口灵活配置缓存策略；同时让每一个接口方便支持数据模拟，可以代码减小侵入性，模拟数据可以从内存，Assets，url轻松获取。

• 服务端接口不严格按照http缓存策略配置，有些不会针对每一个请求单独配置缓存策略
• 第三方缓存库不是很方便的针对每一个接口进行缓存策略配置，侵入性比较大
• 很方便的针对每个接口添加模拟数据

• 不走缓存例子

@GET("users")
Observable<HttpResult> test();

• 缓存设置为20秒

@Cache(time = 20)
@GET("users")
Observable<HttpResult> test();

• 缓存设置为20分钟

@Cache(time = 20,timeUnit = TimeUnit.MINUTES)
@GET("users")
Observable<HttpResult> test();

• 默认时间缓存,默认是0秒

@Cache()
@GET("users")
Observable<HttpResult> test();

• 默认在无网的时候强制走缓存，forceCacheNoNet=false时无网络时不强制缓存

@Cache(forceCacheNoNet = false)
@GET("users")
Observable<HttpResult> test();

• 添加模拟数据（value,assets,url同时都配置的话，就按照这个顺序处理）

@Mock(value = "{\"data\":\"mockdata\"}") //模拟内存数据
@GET("users")
Observable<HttpResult> test();

@Mock(assets = "mock/mock.json") //从assets获取模拟数据
@GET("users")
Observable<HttpResult> test();

@Mock(url = "http://url.com/test") //从新的url请求数据
@GET("users")
Observable<HttpResult> test();

缓存只对http Get请求有效；如果要问为什么，可以问问后台开发同学

• 添加 jcenter lib,注意根据自己的库选择

compile 'ren.yale.android:retrofitcachelib:1.1.1'   //retrofit2+okhttp3+rxjava1
compile 'ren.yale.android:retrofitcachelibrx2:1.1.1'   //retrofit2+okhttp3+rxjava2

• 在Android Application里初始化

RetrofitCache.getInstance().init(this);

也可以修改默认配置，默认time=0，timeUnit = TimeUnit.SECONDS

RetrofitCache.getInstance().init(this).setDefaultTimeUnit(TimeUnit.MINUTES).setDefaultTime(1);

• OkHttpClient初始化时配置缓存目录

okhttp3.OkHttpClient.Builder clientBuilder=new okhttp3.OkHttpClient.Builder();
...
int cacheSize = 200 * 1024 * 1024;
File cacheDirectory = new File(mContext.getCacheDir(), "httpcache");
Cache cache = new Cache(cacheDirectory, cacheSize);
OkHttpClient client =  clientBuilder.cache(cache).build();
...

• 给okhttp添加拦截器

okhttp3.OkHttpClient.Builder clientBuilder=new okhttp3.OkHttpClient.Builder();
...

//clientBuilder.addInterceptor(new MockInterceptor()); //如果只用Mock模拟功能,只需添加这个拦截器
clientBuilder.addInterceptor(new CacheForceInterceptorNoNet());
clientBuilder.addNetworkInterceptor(new CacheInterceptorOnNet());
...

添加CacheForceInterceptorNoNet作用是在无网时强制走缓存,如果只添加了CacheInterceptorOnNet,那么在有网和无网的缓存策略就会一样

• 添加retrofit对象

Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(url)
                .client(getOkHttpClient())
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();
RetrofitCache.getInatance().addRetrofit(retrofit);

• 添加 rx Observable compose

api.test().compose(CacheTransformer.emptyTransformer())...

• setCacheInterceptorListener 设置是否每一个接口都缓存

RetrofitCache.getInstance().setCacheInterceptorListener(
                new CacheInterceptorListener() {
            @Override
            public boolean canCache(Request request,Response response) {
                String res = "";
                try {
                    res = response.body().string();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return true;
            }
});

• 设置是否走模拟数据,比如说在正式接口好了后可以如下设置，让模拟数据失效

RetrofitCache.getInstance().enableMock(false);

• 忽略某个参数;如果你对原url增加参数，可以设置忽略

 RetrofitCache.getInstance().addIgnoreParam("access_token");

-dontwarn ren.yale.android.retrofitcachelib.**
-keep class ren.yale.android.retrofitcachelib.** { *; }
-keepclasseswithmembernames class rx.Observable { *; }
-keepclasseswithmembernames class rx.internal.operators.OnSubscribeLift { *; }
-keepclasseswithmembernames class retrofit2.adapter.rxjava.RxJavaCallAdapterFactory { *; }
-keepclasseswithmembernames class retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe { *; }
-keepclasseswithmembernames class retrofit2.Retrofit { *; }
-keepclasseswithmembernames class retrofit2.ServiceMethod { *; }
-keepclasseswithmembernames class retrofit2.OkHttpCall { *; }

###retrofit2 2.5.0
-keepclasseswithmembernames class retrofit2.HttpServiceMethod {*;}
-keepclasseswithmembernames class retrofit2.RequestFactory {*;}

#retrofit2,okhttp3,rxjava1等其它混淆配置请自行添加

-dontwarn ren.yale.android.retrofitcachelibrx2.**
-keep class ren.yale.android.retrofitcachelibrx2.** { *; }
-keepclasseswithmembernames class  retrofit2.adapter.rxjava2.BodyObservable { *; }
-keepclasseswithmembernames class  retrofit2.adapter.rxjava2.ResultObservable { *; }
-keepclasseswithmembernames class  retrofit2.adapter.rxjava2.CallEnqueueObservable { *; }
-keepclasseswithmembernames class  retrofit2.adapter.rxjava2.CallExecuteObservable { *; }
-keepclasseswithmembernames class retrofit2.Retrofit { *; }
-keepclasseswithmembernames class retrofit2.ServiceMethod { *; }
-keepclasseswithmembernames class retrofit2.OkHttpCall { *; }

###retrofit2 2.5.0
-keepclasseswithmembernames class retrofit2.HttpServiceMethod {*;}
-keepclasseswithmembernames class retrofit2.RequestFactory {*;}

#retrofit2,okhttp3,rxjava2等其它混淆配置请自行添加

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