What are the proguard rules for SignalR android client?

Question

I have a chat application using SignalR. Recently I have enabled PROGUARD. Gson proguard rules are OK. For debug apk, chat message sending to server OK. Server pushes the message to chat_Receiver but I can see the response only on below "SignalR LOG" for chat_Receiver.

Platform.loadPlatformComponent(new AndroidPlatformComponent());
    String serverUrl = getString(R.string.BaseUrl) + "/signalr";
    printLog = true;
    mHubConnection = new HubConnection(serverUrl, "MobileNumber=" + sender_mobile_numberEn, false, new Logger() {
        @Override
        public void log(String s, LogLevel logLevel) {
            if (printLog) {
                Log.d(TAG, "SignalR LOG:" + s);
            }

        }
    });
    mHubProxy = mHubConnection.createHubProxy(SERVER_HUB_CHAT);

But I don,t get the response on below "ChatMessageResponse LOG" for release apk.

private void registerReceiver() {
    Log.d(TAG, "registerReceiver called");

    mHubProxy.on("PushMessageToClient", new SubscriptionHandler1<ChatMessageResponsePOCO[]>() {
        @Override
        public void run(final ChatMessageResponsePOCO[] msgs) {

            Gson gsonForArray = new GsonBuilder().create();
            JsonArray jsonArray = gsonForArray.toJsonTree(msgs).getAsJsonArray();

            Log.d(TAG, "ChatMessageResponse LOG: " + jsonArray);

            processChatMessaages(jsonArray);

        }

    }, ChatMessageResponsePOCO[].class);
}

proguard-rules.pro file is as below:

# Add project specific ProGuard rules here.
            # By default, the flags in this file are appended to flags specified
# in F:\AndroidStudio/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the proguardFiles
# directive in build.gradle.
#
        # For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

            # Add any project specific keep options here:

            # If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
            #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

-dontwarn **
            -target 1.7
            -dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose

#############################################
        -injars      libs
-outjars     bin/classes-processed.jar

-repackageclasses ''
            -allowaccessmodification
-optimizations !code/simplification/arithmetic

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider

-keep public class * extends android.preference.Preference
-keep public class * implements java.io.Serializable
-keep public class * extends android.support.v4.app.Fragment
-keep public class * extends android.support.v4.app.ListFragment

-keep public class org.apache.** {
  <fields>;
  <methods>;
    }

#Don't obfuscate the model classes. 
            -keep class aerotxt.model.** { *; }


##---------------Begin: proguard configuration for Gson  ----------
            # Gson uses generic type information stored in a class file when working with fields. Proguard
# removes such information by default, so configure it to keep all of it.
            -keepattributes Signature

# For using GSON @Expose annotation
-keepattributes *Annotation*

            # Gson specific classes
-dontwarn sun.misc.**
            #-keep class com.google.gson.stream.** { *; }

# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }

# Prevent proguard from stripping interface information from TypeAdapterFactory,
# JsonSerializer, JsonDeserializer instances (so they can be used in @JsonAdapter)
-keep class * implements com.google.gson.TypeAdapterFactory
-keep class * implements com.google.gson.JsonSerializer
-keep class * implements com.google.gson.JsonDeserializer

##---------------End: proguard configuration for Gson  ----------
            #############################################

            # ----------------------------------------
            # Android Support Library
# ----------------------------------------
        -dontwarn android.support.**
            -keep class android.support.** { *; }

#Below 2 attributes are used for otto library
-keepattributes *Annotation*
            -keepclassmembers class ** {
        @com.squareup.otto.Subscribe public *;
        @com.squareup.otto.Produce public *;
    }

Everything works fine for debug apk even after enabling Proguard. Problem is for only release apk. What will be the solution or the proguard rules for this.? 

Marsiella

Are you sure this is a Proguard issue ? If yes there should be some error containing ClassNotFoundException . Check logs . Otherwise check the debug and release config . Maybe some Key is missing . – Rondi

No error is found. but after disabling proguard everything works fine for release apk. – Marsiella

Answer 1

Add the following lines in your proguard rules:

 -keep class com.microsoft.signalr.** { *; }
 -keep interface com.microsoft.signalr.** { *; }

This work for me!

Earp

In my case it was so that in release build WebSocket stopped automatically right after establishing a connection with WebSocket connection stopping with code 1000 and reason ' '. Adding the rules did the trick. Much appreciate! – Corrigendum

Don't forget to add your custom model in proguard rules, that using while receive response in .on<CustomModel>() method’s. – Conductor