Add support for http cache

app/src/main/java/com/hippo/ehviewer/EhApplication.java

@@ -67,6 +67,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
+import okhttp3.Cache;
 import okhttp3.OkHttpClient;
 
 public class EhApplication extends RecordingApplication {
@@ -88,6 +89,7 @@ public class EhApplication extends RecordingApplication {
     private EhClient mEhClient;
     private EhProxySelector mEhProxySelector;
     private OkHttpClient mOkHttpClient;
+    private Cache mOkHttpCache;
     private ImageBitmapHelper mImageBitmapHelper;
     private Conaco<ImageBitmap> mConaco;
     private LruCache<Long, GalleryDetail> mGalleryDetailCache;
@@ -137,6 +139,7 @@ public class EhApplication extends RecordingApplication {
                     .writeTimeout(5, TimeUnit.SECONDS)
                     .callTimeout(10, TimeUnit.SECONDS)
                     .cookieJar(getEhCookieStore(application))
+                    .cache(getOkHttpCache(application))
                     .dns(new EhDns(application))
                     .proxySelector(getEhProxySelector(application))
                     .build();
@@ -144,6 +147,15 @@ public class EhApplication extends RecordingApplication {
         return application.mOkHttpClient;
     }
 
+    @NonNull
+    public static Cache getOkHttpCache(@NonNull Context context) {
+        EhApplication application = ((EhApplication) context.getApplicationContext());
+        if (application.mOkHttpCache == null) {
+            application.mOkHttpCache = new Cache(new File(application.getCacheDir(), "http_cache"), 50L * 1024L * 1024L);
+        }
+        return application.mOkHttpCache;
+    }
+
     @NonNull
     public static ImageBitmapHelper getImageBitmapHelper(@NonNull Context context) {
         EhApplication application = ((EhApplication) context.getApplicationContext());

app/src/main/java/com/hippo/ehviewer/client/EhDns.java

@@ -61,7 +61,7 @@ public class EhDns implements Dns {
     public EhDns(Context context) {
         hosts = EhApplication.getHosts(context);
         DnsOverHttps.Builder builder = new DnsOverHttps.Builder()
-                .client(new OkHttpClient.Builder().build())
+                .client(new OkHttpClient.Builder().cache(EhApplication.getOkHttpCache(context)).build())
                 .url(HttpUrl.get("https://cloudflare-dns.com/dns-query"));
         try {
             builder.bootstrapDnsHosts(InetAddress.getByName("162.159.36.1"),