java - Retrofit 2.0 + GSON + Android: Unable to invoke no-args constructor for interface retrofit2.http.Body

Question

I am trying to create a simple News app with the following endpoint:

https://content.guardianapis.com/search?api-key=...&show-fields=thumbnail&show-blocks=body&type=article

I know there are 2-3 questions already on SO about this but I belive that this exception is unique since it can not create a constructor for a library interace?!...

Here are my project files:

Retrofit client

Model classes

Custom adapter and activity

I get the following RuntimeException when trying to call

call.enqueue(new Callback<News>() {

In the main activity:

Unable to invoke no-args constructor for interface retrofit2.http.Body. Registering an InstanceCreator with Gson for this type may fix this problem.

So far I have tried:

• Creating no-arg constructors for each of my model classes as mentioned in another similar question

• Checking whether the any of the classes share similar names with the retrofit interace as mentioned here and here

Any idea what could cause this? I belive my code should be working and since the error is with a the retrofit2.http.Body interface which to my knowledge I should not have to implement anywhere...

I really appreciate any form of help! Thanks!

标签： javaandroidjsongsonretrofit

Answer 1

您拥有的Blocks模型没有导入正确的Body类型。

您所要做的就是删除以下行：

import retrofit2.http.Body;

这样，您的模型将使用Body同一包中的类。