Android Retrofit POST ArrayList

Trying to send List<String> to server and have Bad Request Error.

public interface PostReviewApi {
        @FormUrlEncoded
        @POST("/")
        void addReview(@Field("review[place_id]") int placeId, @Field("review[content]") String review,
                       @Field("review[rating]") float rating, @Field("review[tag_list]") List<String> tagsList, Callback<ReviewEntity> callback);
    }

...
    postApi.addReview(mRestaurantId, reviewText, (float) mRating, tagsList, new Callback<ReviewEntity>() {
                @Override
                public void success(ReviewEntity reviewEntity, Response response) {
                }

                @Override
                public void failure(RetrofitError error) {
                }
            });
        }

Make @Field("review[tag_list[]]") doesn't help either

Try using @Body annotation instead of @Field and passing a single ReviewBody object.

class ReviewBody {

    public Review review;

    public ReviewBody(int placeId, float rating, String content, List<String> tagList) {
        review = new Review(placeId, rating, content, tagList);
    }

    public class Review {
        @SerializedName("place_id")
        public int placeId;
        public float rating; 
        public String content;
        @SerializedName("tag_list")
        public List<String> tagList;

        public Review(int placeId, float rating, String content, List<String> tagList) {
            this.placeId = placeId;
            this.rating = rating;
            this.content = content;
            this.tagList = tagList;
        }
    }
}

@POST("/")
void addReview(@Body ReviewBody body, Callback<ReviewEntity> callback);

(without @FormUrlEncoded)