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java – Retrofit 2.4.0 with proguard

Posted by: admin June 15, 2020 Leave a comment


When I add Retrofit 2.4.0 library to android project >

implementation 'com.squareup.retrofit2:retrofit:2.4.0'

and set minifyEnabled {true}

buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

and then add these rules to proguard-rules.pro

-keep class com.squareup.** { *; }
-keep interface com.squareup.** { *; }
-keep class retrofit2.** { *; }
-keep interface retrofit2.** { *;}
-keep interface com.squareup.** { *; }

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

-dontwarn rx.**
-dontwarn retrofit2.**
-dontwarn okhttp3.**
-dontwarn okio.**

Finally built and generated signed apk successfully but the issue is when run the ( release apk) > Retrofit requests not send and return { null } ..
Whats the solution Please!

How to&Answers:

maybe because of other library work with retrofit like your downloader or parser.

important notice :

add rule to keep your model classes and subjects that work with parser like :

-keep class com.address_package.** { *; }

if you use okhttp or Okhttp3 with retrofit added below rules

note :and check your parser proguard rules too


-keep class com.squareup.okhttp.** { *; }
-keep interface com.squareup.okhttp.** { *; }

-dontwarn com.squareup.okhttp.**
-dontwarn okio.**


-keepattributes Signature
-keepattributes *Annotation*
-keep class okhttp3.** { *; }
-keep interface okhttp3.** { *; }

-dontwarn okhttp3.**


Your Proguard rules work for Retrofit, but they’re also obfuscating the model classes that you use to serialize/deserialize your data. Their names are important as Retrofit/Gson matches them to do serializing/deserializing. Proguard turns them into gibberish like a and b so Retrofit/Gson cannot make sense of them.

Depending on your package setup, you need to add the following like amin mahmodi mentioned.

-keep class your.package.name.models.** { *; }