Android 使用OKHttp进行改造如何在脱机时使用缓存数据
我想在没有互联网的情况下改用OkHttp使用缓存 我准备OkHttpClient如下:Android 使用OKHttp进行改造如何在脱机时使用缓存数据,android,caching,gzip,retrofit,okhttp,Android,Caching,Gzip,Retrofit,Okhttp,我想在没有互联网的情况下改用OkHttp使用缓存 我准备OkHttpClient如下: RestAdapter.Builder builder= new RestAdapter.Builder() .setRequestInterceptor(new RequestInterceptor() { @Override public void intercept(RequestFacade request) {
RestAdapter.Builder builder= new RestAdapter.Builder()
.setRequestInterceptor(new RequestInterceptor() {
@Override
public void intercept(RequestFacade request) {
request.addHeader("Accept", "application/json;versions=1");
if (MyApplicationUtils.isNetworkAvaliable(context)) {
int maxAge = 60; // read from cache for 1 minute
request.addHeader("Cache-Control", "public, max-age=" + maxAge);
} else {
int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
request.addHeader("Cache-Control",
"public, only-if-cached, max-stale=" + maxStale);
}
}
});
Cache cache = null;
try {
cache = new Cache(httpCacheDirectory, 10 * 1024 * 1024);
} catch (IOException e) {
Log.e("OKHttp", "Could not create http cache", e);
}
OkHttpClient okHttpClient = new OkHttpClient();
if (cache != null) {
okHttpClient.setCache(cache);
}
并按如下方式设置缓存:
RestAdapter.Builder builder= new RestAdapter.Builder()
.setRequestInterceptor(new RequestInterceptor() {
@Override
public void intercept(RequestFacade request) {
request.addHeader("Accept", "application/json;versions=1");
if (MyApplicationUtils.isNetworkAvaliable(context)) {
int maxAge = 60; // read from cache for 1 minute
request.addHeader("Cache-Control", "public, max-age=" + maxAge);
} else {
int maxStale = 60 * 60 * 24 * 28; // tolerate 4-weeks stale
request.addHeader("Cache-Control",
"public, only-if-cached, max-stale=" + maxStale);
}
}
});
Cache cache = null;
try {
cache = new Cache(httpCacheDirectory, 10 * 1024 * 1024);
} catch (IOException e) {
Log.e("OKHttp", "Could not create http cache", e);
}
OkHttpClient okHttpClient = new OkHttpClient();
if (cache != null) {
okHttpClient.setCache(cache);
}
我在根设备上进行了检查,在缓存目录中保存了带有“响应头”和Gzip文件的文件
但我并没有从脱机的改装缓存中得到正确的答案,尽管在GZip文件中,我的正确答案是编码的。那么,我如何才能进行改装?我可以读取GZip文件,他如何知道应该是哪个文件(因为我有一些其他响应的文件)?我的公司有一个类似的问题:) 问题出在服务器端。在serwer的回复中,我有:
Pragma: no-cache
所以当我把它移除后,一切都开始工作了。在我删除它之前,我一直收到这样的异常:504不可满足的请求(仅在缓存时)
好的,那么我这边的实现看起来如何
OkHttpClient okHttpClient = new OkHttpClient();
File httpCacheDirectory = new File(appContext.getCacheDir(), "responses");
Cache cache = new Cache(httpCacheDirectory, maxSizeInBytes);
okHttpClient.setCache(cache);
OkClient okClient = new OkClient(okHttpClient);
RestAdapter.Builder builder = new RestAdapter.Builder();
builder.setEndpoint(endpoint);
builder.setClient(okClient);
如果您在测试中遇到问题,问题出在哪一边(服务器或应用程序)。您可以使用这种安全设置从服务器接收的头
private static final Interceptor REWRITE_CACHE_CONTROL_INTERCEPTOR = new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Response originalResponse = chain.proceed(chain.request());
return originalResponse.newBuilder()
.removeHeader("Pragma")
.header("Cache-Control",
String.format("max-age=%d", 60))
.build();
}
};
简单地加上:
okHttpClient.networkInterceptors().add(REWRITE_CACHE_CONTROL_INTERCEPTOR);
多亏了这一点,正如您所看到的,我能够删除测试时间的Pragma:no cache
头
另外,我建议您阅读缓存控制
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