所以这就是问题所在，我正在尝试为我的应用程序实现缓存，并按照本教程Android: Cache network requests for offline access with Retrofit2 and OkHTTP3进行操作。遗憾的是，当没有互联网连接时，缓存的响应没有出现，而是
Toast.makeText（getContext（），getContext（）。getResources（）。getString（R.string.error_failed_to_load_posts），Toast.LENGTH_SHORT）.show（）;
被执行。那么有谁能告诉我我做错了什么？或者指导我得到这个问题的答案？如果你问我，如果需要，我会发布其他信息。以下是特定功能的完整代码。
private void loadHomeLoggedPosts(String uid) {
progressBar.setVisibility(View.VISIBLE);
OkHttpClient client = new OkHttpClient
.Builder()
.cache(new Cache(getContext().getCacheDir(), 10 * 1024 * 1024)) // 10 MB
.addInterceptor(new Interceptor() {
@Override public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
if (Utils.isNetworkAvailable(getContext())) {
request = request.newBuilder().header("Cache-Control", "public, max-age=" + 60).build();
} else {
request = request.newBuilder().header("Cache-Control", "public, only-if-cached, max-stale=" + 60 * 60 * 24 * 7).build();
}
return chain.proceed(request);
}
})
.build();
Gson gson = new GsonBuilder()
.setLenient()
.create();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(getResources().getString(R.string.app_base_url))
.client(client)
.addConverterFactory(GsonConverterFactory.create(gson))
.build();
RequestInterface request = retrofit.create(RequestInterface.class);
Call<Classes> call = request.homeLoggedPosts(uid);
call.enqueue(new Callback<Classes>() {
@Override
public void onResponse(Call<Classes> call, Response<Classes> response) {
Classes jsonResponse = response.body();
if (jsonResponse!=null) {
homePosts = jsonResponse.getHomePosts();
homeLoggedInAdapter = new HomeLoggedInAdapter(homePosts);
recyclerView.setAdapter(homeLoggedInAdapter);
homeLoggedInAdapter.notifyDataSetChanged();
}
else {
Toast.makeText(getContext(), getContext().getResources().getString(R.string.error_failed_to_load_posts), Toast.LENGTH_SHORT).show();
}
progressBar.setVisibility(View.INVISIBLE);
}
@Override
public void onFailure(Call<Classes> call, Throwable t) {
progressBar.setVisibility(View.INVISIBLE);
Toast.makeText(getContext(), getContext().getResources().getString(R.string.error_failed_to_load_posts), Toast.LENGTH_SHORT).show();
Log.d("ERROR", t.getMessage());
}
});
}
编辑：我在同一个片段中有两个函数调用如下：
if (FirebaseAuth.getInstance().getCurrentUser()!=null) {
loadHomeLoggedPosts(FirebaseAuth.getInstance().getCurrentUser().getUid());
}
else {
loadHomeNotLoggedPosts();
}
我已经发布了上面的loadHomeLoggedPosts代码。 loadHomeNotLoggedPosts与此区别相同：
RequestInterface request = retrofit.create(RequestInterface.class);
Call<Classes> call = request.homeNotLoggedPosts();
Farmaan Elahis的回答适用于loadHomeNotLoggedPosts，但不适用于loadHomeLoggedPosts。任何帮助都非常感谢。谢谢！
Okhttp日志：由于日志太大而无法完全发布，我已经删除了部分内容。
拳头启动：
08-27 18:35:29.426 32673-32673/com.appsoflife.microstories I/System.out: Cache CREATED!
08-27 18:35:29.452 32673-2498/com.appsoflife.microstories D/OkHttp: --> POST http://my_web_site.com/jacob/micro_stories/queries/home_logged.php http/1.1
08-27 18:35:29.452 32673-2498/com.appsoflife.microstories D/OkHttp: Content-Type: application/x-www-form-urlencoded
08-27 18:35:29.452 32673-2498/com.appsoflife.microstories D/OkHttp: Content-Length: 32
08-27 18:35:29.452 32673-2498/com.appsoflife.microstories D/OkHttp: uid=MY_USER_ID
08-27 18:35:29.452 32673-2498/com.appsoflife.microstories D/OkHttp: --> END POST (32-byte body)
08-27 18:35:29.460 32673-2363/com.appsoflife.microstories D/AppTracker: App Event: start
08-27 18:35:29.502 32673-32673/com.appsoflife.microstories E/RecyclerView: No adapter attached; skipping layout
08-27 18:35:29.592 32673-32679/com.appsoflife.microstories I/art: Do partial code cache collection, code=27KB, data=30KB
08-27 18:35:29.593 32673-32679/com.appsoflife.microstories I/art: After code cache collection, code=26KB, data=29KB
08-27 18:35:29.593 32673-32679/com.appsoflife.microstories I/art: Increasing code cache capacity to 128KB
08-27 18:35:29.614 32673-32673/com.appsoflife.microstories W/PropertyValuesHolder: Method set() with type float not found on target class class me.zhanghai.android.materialprogressbar.IndeterminateHorizontalProgressDrawable$RectTransformX
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: <-- 200 OK http://my_web_site.com/jacob/micro_stories/queries/home_logged.php (3634ms)
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Date: Sun, 27 Aug 2017 13:05:29 GMT
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Server: Apache/2.4.25
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: X-Powered-By: PHP/5.6.30
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Vary: Accept-Encoding,User-Agent
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Keep-Alive: timeout=5
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Connection: Keep-Alive
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Transfer-Encoding: chunked
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Content-Type: text/html; charset=UTF-8
08-27 18:35:33.088 32673-2498/com.appsoflife.microstories D/OkHttp: Cache-Control: max-age=120
08-27 18:35:37.890 32673-2653/com.appsoflife.microstories I/FirebaseCrash: Sending crashes
08-27 18:35:41.664 32673-32695/com.appsoflife.microstories W/art: Suspending all threads took: 9.530ms
08-27 18:35:41.681 32673-2498/com.appsoflife.microstories D/OkHttp:
MY_JSON_OUTPUT_TOO_LONG_TO_POST
08-27 18:35:41.721 32673-2498/com.appsoflife.microstories D/OkHttp: <-- END HTTP (3297402-byte body)
第二时间：
08-27 18:37:35.904 5089-5089/com.appsoflife.microstories I/System.out: Cache CREATED!
08-27 18:37:35.922 5089-5190/com.appsoflife.microstories D/OkHttp: --> POST http://my_web_site.com/jacob/micro_stories/queries/home_logged.php http/1.1
08-27 18:37:35.922 5089-5190/com.appsoflife.microstories D/OkHttp: Content-Type: application/x-www-form-urlencoded
08-27 18:37:35.922 5089-5190/com.appsoflife.microstories D/OkHttp: Content-Length: 32
08-27 18:37:35.922 5089-5190/com.appsoflife.microstories D/OkHttp: uid=MY_USER_ID
08-27 18:37:35.922 5089-5190/com.appsoflife.microstories D/OkHttp: --> END POST (32-byte body)
08-27 18:37:35.934 5089-5135/com.appsoflife.microstories D/AppTracker: App Event: start
08-27 18:37:35.979 5089-5089/com.appsoflife.microstories E/RecyclerView: No adapter attached; skipping layout
08-27 18:37:36.058 5089-5094/com.appsoflife.microstories I/art: Do partial code cache collection, code=26KB, data=30KB
08-27 18:37:36.058 5089-5094/com.appsoflife.microstories I/art: After code cache collection, code=25KB, data=29KB
08-27 18:37:36.058 5089-5094/com.appsoflife.microstories I/art: Increasing code cache capacity to 128KB
08-27 18:37:36.083 5089-5089/com.appsoflife.microstories W/PropertyValuesHolder: Method set() with type float not found on target class class me.zhanghai.android.materialprogressbar.IndeterminateHorizontalProgressDrawable$RectTransformX
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: <-- 200 OK http://my_web_site.com/jacob/micro_stories/queries/home_logged.php (3937ms)
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Date: Sun, 27 Aug 2017 13:07:36 GMT
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Server: Apache/2.4.25
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: X-Powered-By: PHP/5.6.30
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Vary: Accept-Encoding,User-Agent
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Keep-Alive: timeout=5
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Connection: Keep-Alive
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Transfer-Encoding: chunked
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Content-Type: text/html; charset=UTF-8
08-27 18:37:39.860 5089-5190/com.appsoflife.microstories D/OkHttp: Cache-Control: max-age=120
08-27 18:37:49.883 5089-5426/com.appsoflife.microstories I/FirebaseCrash: Sending crashes
08-27 18:37:51.044 5089-5190/com.appsoflife.microstories D/OkHttp:
JSON_OUTPUT_TOO_LONG_TO_POST
read: unexpected EOF!
答案 0 :(得分：2)
您可以使用以下代码构建okhttp客户端，该客户端可以同时具有2分钟有效的在线缓存以及7天内有效的脱机缓存。
PS：你需要考虑首次打开应用程序，连接互联网显示它不会抛出异常
private static OkHttpClient provideOkHttpClient ()
{
return new OkHttpClient.Builder()
.addInterceptor( provideOfflineCacheInterceptor() )
.addNetworkInterceptor( provideCacheInterceptor() )
.cache( provideCache() )
.build();
}
private static Cache provideCache ()
{
Cache cache = null;
try
{
cache = new Cache( new File( getApplicationContext().getInstance().getCacheDir(), "http-cache" ),
10 * 1024 * 1024 ); // 10 MB
}
catch (Exception e)
{
Timber.e( e, "Could not create Cache!" );
}
return cache;
}
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 ( !AndroidUtils.isNetworkAvailable() )
{
CacheControl cacheControl = new CacheControl.Builder()
.maxStale( 7, TimeUnit.DAYS )
.build();
request = request.newBuilder()
.cacheControl( cacheControl )
.build();
}
return chain.proceed( request );
}
};
}
答案 1 :(得分：0)
POST调用不会在Retrofit中缓存。它在文档中