Android : Using Retrofit with generic types for JSON Response

Help please T_T been digging for 2 days for a solution to this problem!

I am using Retrofit to make some networking tasks in my app, One of the APIs that I am calling returns a different object sometimes, but i know when and what it will return everytime I call it.

In this case the Message is an object

{
  "key": "some key",
  "category": "some category",
  "channel": "some channel",
  "status": "some status",
  "message": {
    "someValue": "54",
    "someOtherValue": "5353"
  }
}

and here the Message is a string

{
  "key": "some key",
  "category": "some category",
  "channel": "some channel",
  "status": "some status",
  "message": "this is a string"
}

so I am trying to achieve a good design of this solution by using generics, I have a generic class like this,

ContentResponse Class

public class ContentResponse<T> {

    private List<Content<T>> content = new ArrayList<Content<T>>();

    public List<Content<T>> getContent() {
        return content;
    }

    public void setContent(List<Content<T>> content) {
        this.content = content;
    }

    private final Class<T> type;

    public ContentResponse(Class<T> type) {
        this.type = type;
    }

    public Class<T> getMyType() {
        return this.type;
    }
}

Content Class

public class Content<T>
{
    private String key;
    private String category;
    private String channel;
    private String status;
    private T message;

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public String getChannel() {
        return channel;
    }

    public void setChannel(String channel) {
        this.channel = channel;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}

ContentInterface Class

public interface ContentInterface<T>
{
    @GET("/public/content/{category}")
    ContentResponse<T> getContent(@Path(PathParameters.CATEGORY) String category);
}

The issue lies here

public class ContentRequest<T> extends RetrofitSpiceRequest<ContentResponse<T>, ContentInterface<T>>
        {
        String category;

        public ContentRequest(Class<ContentResponse<T>> clazz, Class<ContentInterface<T>> retrofittedInterfaceClass, String category) {
            super(clazz, retrofittedInterfaceClass);
            this.category = category;
        }


        @Override
        public ContentResponse<T> loadDataFromNetwork() throws Exception {
            return getService().getContent(category);
        }
    }

In this context i know that the object returned is a Map<String, String>

    contentRequest = new ContentRequest(new Class<ContentResponse<Map<String, String>>>(),
new Class<ContentInterface<Map<String, String>>>(),
"appstrings");

but i get this !!

'class()' is not public in java.lang.Class

i cant just call ContentResponse<Map<String,String>>.class, so what can I do here ?