Solution: declare body value in your interface with next: @Body RequestBody body and wrap String JSON object: RequestBody body = RequestBody.create(MediaType.parse(“application/json”), obj.toString());
Recently I just finish one project related to retrofit2. Based on my source, I copy all your stuff into my project to give a try, making some minor change, it works well on my side. In your build.gradle, add those: compile ‘com.squareup.retrofit2:retrofit:2.0.1’ compile ‘com.google.code.gson:gson:2.6.2’ compile ‘com.squareup.okhttp3:okhttp:3.1.2’ compile ‘com.squareup.retrofit2:converter-gson:2.0.1’ compile ‘com.squareup.okhttp3:logging-interceptor:3.2.0′ Model: (UPDATE: Follow tommus’s case, … Read more