Android 改装2&;时出现此错误;OkHttp3。“无法解析主机”&书信电报;主机名>&引用;:没有与主机名关联的地址
我正在使用改造2和OkHttp3从服务器请求数据。我刚刚添加了一个脱机缓存代码,但它没有按预期工作。我收到错误“无法解析主机”:没有与主机名关联的地址 当尝试从缓存中获取检索数据时(没有internet连接时),会发生这种情况。下面是一段代码片段Android 改装2&;时出现此错误;OkHttp3。“无法解析主机”&书信电报;主机名>&引用;:没有与主机名关联的地址,android,okhttp,retrofit2,offline-caching,okhttp3,Android,Okhttp,Retrofit2,Offline Caching,Okhttp3,我正在使用改造2和OkHttp3从服务器请求数据。我刚刚添加了一个脱机缓存代码,但它没有按预期工作。我收到错误“无法解析主机”:没有与主机名关联的地址 当尝试从缓存中获取检索数据时(没有internet连接时),会发生这种情况。下面是一段代码片段 public static Interceptor provideCacheInterceptor() { return new Interceptor() { @Override public Response
public static Interceptor provideCacheInterceptor() {
return new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Response response = chain.proceed(chain.request());
// re-write response header to force use of cache
CacheControl cacheControl = new CacheControl.Builder()
.maxAge(2, TimeUnit.MINUTES)
.build();
return response.newBuilder()
.header(CACHE_CONTROL, cacheControl.toString())
.build();
}
};
}
public static Interceptor provideOfflineCacheInterceptor() {
return new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
if (!hasNetwork) {
CacheControl cacheControl = new CacheControl.Builder()
.onlyIfCached()
.maxStale(7, TimeUnit.DAYS)
.build();
request = request.newBuilder()
.removeHeader("Pragma")
.cacheControl(cacheControl)
.build();
}
return chain.proceed(request);
}
};
}
private static Cache provideCache() {
Cache cache = null;
try {
cache = new Cache(new File(AdeptAndroid.getInstance().getCacheDir(), "http-cache"),
10 * 1024 * 1024); // 10 MB
} catch (Exception e) {
Log.d("Test", "Could not create Cache!");
}
return cache;
}
最后是一种结合了所有这些的方法
private static OkHttpClient provideOkHttpClient() {
return new OkHttpClient.Builder()
.addInterceptor(provideHttpLoggingInterceptor())
.addInterceptor(provideOfflineCacheInterceptor())
.addNetworkInterceptor(provideCacheInterceptor())
.cache(provideCache())
.build();
}
您的服务器响应有一个“Pragma:no cache”头。您应该在响应拦截器而不是请求拦截器中删除此标头 在当前代码中,您已将其从请求拦截器中删除 您的
provideCacheInterceptor()
应该如下所示:
public static Interceptor provideCacheInterceptor() {
return new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Response response = chain.proceed(chain.request());
// re-write response header to force use of cache
CacheControl cacheControl = new CacheControl.Builder()
.maxAge(2, TimeUnit.MINUTES)
.build();
return response.newBuilder()
.header(CACHE_CONTROL, cacheControl.toString())
.removeHeader("Pragma")
.build();
}
};
}
client.addInterceptor(provideOfflineCacheInterceptor(context))
client.addNetworkInterceptor(provideCacheInterceptor(context))
private fun provideOfflineCacheInterceptor(context: Context): Interceptor {
return Interceptor { chain ->
var request = chain.request()
var cacheHeaderValue = if (!hasNetwork(context)!!){
"public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
} else {
"public, max-age=" + 5
}
request = request.newBuilder().header("Cache-Control", cacheHeaderValue).build()
chain.proceed(request)
}
}
private fun provideCacheInterceptor(context: Context): Interceptor {
return Interceptor { chain ->
val request = chain.request()
var cacheHeaderValue = if (!hasNetwork(context)!!){
"public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
} else {
"public, max-age=" + 5
}
//request = request.newBuilder().build()
val response = chain.proceed(request)
response.newBuilder()
.removeHeader("Pragma")
.removeHeader("Cache-Control")
.header("Cache-Control", cacheHeaderValue)
.build()
}
}
我在与kotlin的项目中遇到了相同的错误,我这样修复了它:
public static Interceptor provideCacheInterceptor() {
return new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Response response = chain.proceed(chain.request());
// re-write response header to force use of cache
CacheControl cacheControl = new CacheControl.Builder()
.maxAge(2, TimeUnit.MINUTES)
.build();
return response.newBuilder()
.header(CACHE_CONTROL, cacheControl.toString())
.removeHeader("Pragma")
.build();
}
};
}
client.addInterceptor(provideOfflineCacheInterceptor(context))
client.addNetworkInterceptor(provideCacheInterceptor(context))
private fun provideOfflineCacheInterceptor(context: Context): Interceptor {
return Interceptor { chain ->
var request = chain.request()
var cacheHeaderValue = if (!hasNetwork(context)!!){
"public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
} else {
"public, max-age=" + 5
}
request = request.newBuilder().header("Cache-Control", cacheHeaderValue).build()
chain.proceed(request)
}
}
private fun provideCacheInterceptor(context: Context): Interceptor {
return Interceptor { chain ->
val request = chain.request()
var cacheHeaderValue = if (!hasNetwork(context)!!){
"public, only-if-cached, max-stale=" + 60 * 60 * 24 * 1
} else {
"public, max-age=" + 5
}
//request = request.newBuilder().build()
val response = chain.proceed(request)
response.newBuilder()
.removeHeader("Pragma")
.removeHeader("Cache-Control")
.header("Cache-Control", cacheHeaderValue)
.build()
}
}
请在Emulator上的Manifest file permission OFF-Airline mode(清单文件许可离机模式)中检查网络“打开”当尝试访问连接网络上不可用的主机名时,会发生这种情况。检查您是否可以通过设备的web浏览器访问此URL。如果没有:这是您的问题。对于我来说,由于emulator中没有internet连接,因此引发了错误。通过这种方式设置标头(正好50000个)解决了问题。header(“缓存控制”,String.format(“max age=%d”,50000))@WaqarYounis感谢您的回复,但它也不起作用。您解决了这个问题吗?我在使用GCM从后台唤醒应用程序时遇到了这个问题。@android_griezmann您是否找到了解决方法,因为存在相同的问题,但无法解决。@dexmorgan不!很抱歉这么说,但到目前为止还没有找到任何解决方案。无法解决我的问题: