如何在翻新中缓存列表数据(图像和名称)?有什么合适的示例来缓存数据会更有用吗?
答案 0 :(得分:0)
好。首先,您必须检查通过邮递员进入api的标头。在那里,您将看到“ Cache-Control”标题。如果要缓存该api,则在此标头中必须有公共缓存值。这是代码:
在您保留基本URL的ApiClient.class中,使用以下方法:
public static CacheControl getCacheControl(CachePolicy cachePolicy) {
switch (cachePolicy) {
case CACHE_ONLY:
return CacheControl.FORCE_CACHE;
case NETWORK_ONLY:
return CacheControl.FORCE_NETWORK;
case NETWORK_ELSE_CACHE:
return new CacheControl.Builder().maxAge(1, TimeUnit.MINUTES).maxStale(1, TimeUnit.MINUTES).build();
case FRESH_CASHE_ELSE_NETWORK:
return new CacheControl.Builder().maxAge(1, TimeUnit.MINUTES).minFresh(1, TimeUnit.MINUTES).build();
case CACHE_ELSE_NETWORK:
return new CacheControl.Builder().immutable().build();
}
return null;
}
现在创建一个枚举类来保留这些常量:
public enum CachePolicy {
CACHE_ONLY,
NETWORK_ONLY,
NETWORK_ELSE_CACHE,
FRESH_CASHE_ELSE_NETWORK,
CACHE_ELSE_NETWORK
}
使用基本网址将该方法粘贴到您的ApiClient类中:
public static Retrofit getClientAuthenticationWithCache(Context context, CacheControl
cacheControl) {
String URL_BASE = "your base url";
long cacheSize = 10 * 1024 * 1024; //10MiB
Cache cache = new Cache(context.getCacheDir(), cacheSize);
Interceptor interceptor = new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
request = request.newBuilder().cacheControl(cacheControl).build();
return chain.proceed(request);
}
};
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.cache(cache)
.addInterceptor(interceptor)
.build();
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl(URL_BASE)
.client(okHttpClient)
.addConverterFactory(GsonConverterFactory.create());
return builder.build();
}
现在在获得响应的活动/片段中使用此方法,如下所示:
ApiClient.getClient(applicationContext, ApiClient.getCacheControl(CachePolicy.NETWORK_ELSE_CACHE)).create(ApiInterface::class.java)