Android - Proguard and retrofit 2?

Resolved my problem :

# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in C:\Users\asheq\AppData\Local\Android\Sdk/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 *;
#}

# Retrofit
-keep class com.google.gson.** { *; }
-keep public class com.google.gson.** {public private protected *;}
-keep class com.google.inject.** { *; }
-keep class org.apache.http.** { *; }
-keep class org.apache.james.mime4j.** { *; }
-keep class javax.inject.** { *; }
-keep class javax.xml.stream.** { *; }
-keep class retrofit.** { *; }
-keep class com.google.appengine.** { *; }
-keepattributes *Annotation*
-keepattributes Signature
-dontwarn com.squareup.okhttp.*
-dontwarn rx.**
-dontwarn javax.xml.stream.**
-dontwarn com.google.appengine.**
-dontwarn java.nio.file.**
-dontwarn org.codehaus.**



-dontwarn retrofit2.**
-dontwarn org.codehaus.mojo.**
-keep class retrofit2.** { *; }
-keepattributes Exceptions
-keepattributes RuntimeVisibleAnnotations
-keepattributes RuntimeInvisibleAnnotations
-keepattributes RuntimeVisibleParameterAnnotations
-keepattributes RuntimeInvisibleParameterAnnotations

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



# Add any classes the interact with gson
# the following line is for illustration purposes
-keep class com.example.asheq.zanis_postmans.ListAddressesActivity
-keep class com.example.asheq.zanis_postmans.ListOrderActivity
-keep class com.example.asheq.zanis_postmans.LoginActivity
-keep class com.example.asheq.zanis_postmans.SendReportsActivity
-keep class com.example.asheq.track.TrackLocationService
-keep class com.example.asheq.track.TrackLocationApplication
-keep class com.example.asheq.models.** { *; }



# Hide warnings about references to newer platforms in the library
-dontwarn android.support.v7.**
# don't process support library
-keep class android.support.v7.** { *; }
-keep interface android.support.v7.** { *; }

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.MapActivity
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
# To support Enum type of class members
-keepclassmembers enum * { *; }

-keep class com.activeandroid.** { *; }
-keep class com.activeandroid.**.** { *; }
-keep class * extends com.activeandroid.Model
-keep class * extends com.activeandroid.serializer.TypeSerializer

-keepclassmembers class ** {
    @org.greenrobot.eventbus.Subscribe <methods>;
}
-keep enum org.greenrobot.eventbus.ThreadMode { *; }

# Only required if you use AsyncExecutor
-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {
    <init>(java.lang.Throwable);
}

2021 solution

Use @keep annotation before your data classes so they're retained. This removes the need of having separate Proguard rules.

Denotes that the annotated element should not be removed when the code is minified at build time. This is typically used on methods and classes that are accessed only via reflection so a compiler may think that the code is unused.

@Keep
data class Listing(
    val id: String = "",
    val name: String = ""
)

Source: https://developer.android.com/reference/kotlin/androidx/annotation/Keep

As per rerofit 3.8.1

-dontwarn okio.**
-dontwarn javax.annotation.**
-dontwarn retrofit2.Platform$Java8

YOU need to keep your models, don't obfuscate them. I saw errors with your models, sqlite cannot work on your models. It should be like this:

-keep class package.to.yourmodels.** { *; }