Retrofit body request is blank with Retrofit, when I use proguard and enable minify and shrinkresources

Question

When I set minifyEnabled & shrinkResources to true,the Retrofit body JSON request sent is blank, and when it is set to false then it works perfectly fine.

I have posted the whole gradle file so that, you can help me telling what I am doing wrong.

My Retrofit request json body goes like this when minifyEnabled & shrinkResources is true :

{} 

It works fine when minifyEnabled & shrinkResources is false:

{"Data":"demoToken","Key":"demokey","Token":"2a9a8677-ac79-49d6-9947-d797b3e4d8e5"} 

My gradle looks like this :

   apply {     plugin 'com.android.application'     plugin 'kotlin-android'     plugin 'kotlin-android-extensions'     plugin 'kotlin-kapt'     plugin 'io.fabric'     plugin 'com.google.firebase.firebase-perf' } android {     compileSdkVersion 28     defaultConfig {         applicationId "com.something.theapp"         minSdkVersion 21         targetSdkVersion 28         versionCode 43          versionName "0.6.7"         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"         flavorDimensions "server"         multiDexEnabled true         vectorDrawables.useSupportLibrary = true         javaCompileOptions {             annotationProcessorOptions {                 includeCompileClasspath = true             }         }     }     signingConfigs {         kaira {             storeFile file('key_tts.jks')             storePassword 'android'             keyAlias 'tts_key'             keyPassword 'android'         }     }     buildTypes {         debug {             signingConfig signingConfigs.kaira             minifyEnabled true             shrinkResources true             buildConfigField "boolean", "ALLOW_DATABASE", "false"             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }         release {             signingConfig signingConfigs.kaira             minifyEnabled true             shrinkResources true             buildConfigField "boolean", "ALLOW_DATABASE", "false"             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'         }     }      productFlavors {         local {             //buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.136:6264/siteapp/api/\"" //            buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.21:5678/api/\""             //   buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.233:5677/api/\""             //  buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.26:5678/api/\""             //buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.25:5678/api/\"" //            buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.37:5678/api/\"" //            buildConfigField "String", "WebServiceUrl", "\"https://api.forsell.in/api/\""             //  buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.23:5678/api/\""             buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.29:5678/api/\""             buildConfigField "String", "WebUrl", "\"https://someurl.in/\""             buildConfigField "String", "ServerName", "\"-Local\""             dimension "server"             copy {                 from "src/local"                 include "google-services.json"                 into "."             }         }         temp {             buildConfigField "String", "WebServiceUrl", "\"http://api.lezza.in/api/\""             buildConfigField "String", "WebUrl", "\"https://someurl.in/\""             buildConfigField "String", "ServerName", "\"-Local\""             dimension "server"             copy {                 from "src/local"                 include "google-services.json"                 into "."             }         }         live {             buildConfigField "String", "WebServiceUrl", "\"https://api.someurl.in/api/\""             buildConfigField "String", "WebUrl", "\"https://someurl.in/\""             buildConfigField "String", "ExtClientNameNew", "\"ExtClientName:TTS\""             dimension "server"             copy {                 from "src/livegcm"                 include "google-services.json"                 into "."             }         }         staging {             //buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.233:85/api/\""//sunil             //     buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.233:5677/api/\""//devang             //   buildConfigField "String", "WebServiceUrl", "\"http://192.168.1.233:85/api/\""             buildConfigField "String", "WebServiceUrl", "\"https://stageapi.someurl.in/api/\""             buildConfigField "String", "WebUrl", "\"https://stageweb.someurl.in/\""             buildConfigField "String", "ServerName", "\"-Staging\""             dimension "server"             copy {                 from "src/local"                 include "google-services.json"                 into "."             }         }     }     compileOptions {         sourceCompatibility JavaVersion.VERSION_1_8         targetCompatibility JavaVersion.VERSION_1_8     }     sourceSets {         main.java.srcDirs += 'src/main/kotlin'     }     dexOptions {         preDexLibraries = false         javaMaxHeapSize "4g" // 2g should be also OK     }     defaultConfig {         vectorDrawables.useSupportLibrary = true     }     lintOptions {         abortOnError false         disable 'MissingTranslation'     } } repositories {     mavenCentral()     maven { url 'https://maven.fabric.io/public' } }  configurations.all {     resolutionStrategy.eachDependency { DependencyResolveDetails details ->         def requested = details.requested         if (requested.group == 'com.android.support') {             if (!requested.name.startsWith("multidex")) {                 details.useVersion '28.0.0'             }         }     } } dependencies {     def lifecycle_version = "2.0.0"     implementation fileTree(include: ['*.jar'], dir: 'libs')     implementation 'androidx.core:core-ktx:1.0.2'     implementation "android.arch.lifecycle:extensions:$lifecycle_version"     annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'     implementation 'androidx.legacy:legacy-support-v4:1.0.0'     implementation 'androidx.appcompat:appcompat:1.0.2'     implementation 'androidx.vectordrawable:vectordrawable:1.0.0-alpha1'     testImplementation 'junit:junit:4.12'     androidTestImplementation 'androidx.test:runner:1.2.0'     androidTestImplementation('com.android.support.test.espresso:espresso-core:3.0.2') {         exclude group: 'com.google.code.findbugs'     }     implementation 'com.squareup.retrofit2:retrofit:2.5.0'     implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'     implementation 'com.squareup.retrofit2:converter-gson:2.5.0'     implementation 'com.squareup.okhttp3:okhttp:3.12.1'     implementation 'com.squareup.okhttp3:logging-interceptor:3.9.0'     implementation 'com.google.android.material:material:1.0.0'     implementation 'androidx.recyclerview:recyclerview:1.0.0'     implementation 'com.github.bumptech.glide:glide:4.5.0'     implementation 'com.karumi:dexter:5.0.0'     implementation 'com.google.android.gms:play-services-maps:16.1.0'     implementation 'com.google.android.gms:play-services-location:16.0.0'     implementation 'com.google.android.gms:play-services-auth:16.0.1'     implementation 'org.jetbrains.anko:anko-common:0.9'     implementation 'com.google.android.gms:play-services-ads:17.2.0'     implementation 'androidx.multidex:multidex:2.0.1'     implementation project(path: ':imagepicker')     implementation 'androidx.percentlayout:percentlayout:1.0.0'     implementation 'com.google.firebase:firebase-core:16.0.9'     implementation 'com.google.firebase:firebase-inappmessaging-display:17.2.0'     implementation 'com.google.firebase:firebase-messaging:18.0.0'     implementation 'com.google.firebase:firebase-config:17.0.0'     implementation 'com.google.firebase:firebase-perf:17.0.2'     implementation 'com.github.chrisbanes:PhotoView:2.3.0'     implementation 'com.google.android.gms:play-services-places:16.1.0'     implementation 'com.google.android.libraries.places:places:1.1.0'     api 'com.theartofdev.edmodo:android-image-cropper:2.8.+'     implementation 'com.github.faruktoptas:RetrofitRssConverterFactory:0.1.0'     implementation 'com.wang.avi:library:2.1.3'     implementation 'com.facebook.android:facebook-android-sdk:5.4.0'     implementation('com.crashlytics.sdk.android:crashlytics:2.9.8@aar') {         transitive = true     }     implementation 'com.haozhang.libary:android-slanted-textview:1.2'     implementation 'com.facebook.shimmer:shimmer:0.4.0'     implementation 'com.github.freshdesk:freshchat-android:1.5.3'     implementation 'commons-io:commons-io:2.4'     implementation 'com.getkeepsafe.taptargetview:taptargetview:1.12.0'     implementation 'com.razorpay:checkout:1.5.6'     implementation 'com.google.android.gms:play-services-analytics:17.0.0'  } apply plugin: 'com.google.gms.google-services' 

Below is my Main model class

class ServiceRequest {      var Key: String? = "SiteAdminAppkey"     var Token: String? = ""     //    var Slug: String? = "admin"     var Data: Any? = null } 

I am able to get this working by adding @SerializeName annotation but I will have to do it in every model class. In one of my other project, Proguard and everything works without serialization.

Answer 1

Add below line in your proguard-rules.pro File

-keepclassmembers,allowobfuscation class * {   @com.google.gson.annotations.SerializedName <fields>; } 

Also add below line in gradle.properties file.

android.enableR8=false 

I face same issue and added above line in the file and its working for me.