After upgrading gradle to 4.0.0, retrofit do not receive response anymore

Question

After upgrading from gradle 3.6.3 to 4.0.0, retrofit only able to send request but not able to receive response.

From the logging I can only see:

I/okhttp.OkHttpClient: --> GET https://stg.xxxxx.com/api/users/profile
I/okhttp.OkHttpClient: --> END GET

// this is missing
I/okhttp.OkHttpClient: <-- GET https://stg.xxxxx.com/api/users/profile

Once I removed the minifyEnabled, shrinkResources and proguardFiles, retrofit able to call api as usual.

Android Studio version: 4.0 Gradle version: 6.1.1 Plugin version: 4.0.0

build.gradle:

buildTypes {
        debug {
            signingConfig signingConfigs.debug
        }
        release {
            signingConfig signingConfigs.release
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

proguard settings for retrofit:

# from https://github.com/square/retrofit/blob/master/retrofit/src/main/resources/META-INF/proguard/retrofit2.pro

# Retrofit does reflection on generic parameters. InnerClasses is required to use Signature and
# EnclosingMethod is required to use InnerClasses.
-keepattributes Signature, InnerClasses, EnclosingMethod

# Retrofit does reflection on method and parameter annotations.
-keepattributes RuntimeVisibleAnnotations, RuntimeVisibleParameterAnnotations

# Retain service method parameters when optimizing.
-keepclassmembers,allowshrinking,allowobfuscation interface * {
    @retrofit2.http.* <methods>;
}

# Ignore annotation used for build tooling.
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

# Ignore JSR 305 annotations for embedding nullability information.
-dontwarn javax.annotation.**

# Guarded by a NoClassDefFoundError try/catch and only used when on the classpath.
-dontwarn kotlin.Unit

# Top-level functions that can only be used by Kotlin.
-dontwarn retrofit2.KotlinExtensions
-dontwarn retrofit2.KotlinExtensions$*

# With R8 full mode, it sees no subtypes of Retrofit interfaces since they are created with a Proxy
# and replaces all potential values with null. Explicitly keeping the interfaces prevents this.
-if interface * { @retrofit2.http.* <methods>; }
-keep,allowobfuscation interface <1>

-dontwarn retrofit2.**
-dontwarn org.codehaus.mojo.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepattributes *Annotation*

-keepattributes RuntimeVisibleAnnotations
-keepattributes RuntimeInvisibleAnnotations
-keepattributes RuntimeVisibleParameterAnnotations
-keepattributes RuntimeInvisibleParameterAnnotations

-keepattributes EnclosingMethod

-keepclasseswithmembers class * {
    @retrofit2.* <methods>;
}

-keepclasseswithmembers interface * {
    @retrofit2.* <methods>;
}

-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}

-keepclasseswithmembers interface * {
    @retrofit2.http.* <methods>;
}

# Platform calls Class.forName on types which do not exist on Android to determine platform.
-dontnote retrofit2.Platform
# Platform used when running on RoboVM on iOS. Will not be used at runtime.
-dontnote retrofit2.Platform$IOS$MainThreadExecutor
# Platform used when running on Java 8 VMs. Will not be used at runtime.
-dontwarn retrofit2.Platform$Java8
# Retain generic type information for use by reflection by converters and adapters.
-keepattributes Signature
# Retain declared checked exceptions for use by a Proxy instance.
-keepattributes Exceptions

Anyone has solution for this?

Answer 1

Keep the all model class of retrofit using @Keep keyword

Example

In Kotlin:

@Keep
data class MarkerData(var planeId : String , var planeData : NewMainFlights)

In Java:

@Keep
class MarkerDataClass {

    String planeId;
    String planeData;

    public MarkerDataClass(String planeId, String planeData) {
        this.planeId = planeId;
        this.planeData = planeData;
    }

}