我的JSON输出有什么问题? retrofit.converter.ConversionException

时间:2015-04-16 20:48:56

标签: java android json gson retrofit

我试图使用一些json的复古装,但是看不出我的json字符串有什么问题,我一直都会遇到同样的错误。

我期待一个单词对象列表,但我错过了什么?有什么想法吗?

  

retrofit.converter.ConversionException:   com.google.gson.JsonSyntaxException:java.lang.IllegalStateException:   预期BEGIN_ARRAY但在第1行第2列路径$

处是BEGIN_OBJECT

JSON:

{
    "words": [
        {
            "id": "1",
            "word": "submarine",
            "word_syllables": "sub-mar-ine",
            "picture": "none.jpg",
            "picture_dir": "",
            "soundfile": "",
            "user_id": "1",
            "created": "2015-04-08 16:32:07",
            "modified": "0000-00-00 00:00:00"
        },
        {
            "id": "2",
            "word": "computer",
            "word_syllables": "com-pute-r",
            "picture": "computer.jpg",
            "picture_dir": "",
            "soundfile": "",
            "user_id": "0",
            "created": "2015-04-08 16:32:07",
            "modified": "0000-00-00 00:00:00"
        }
    ]
}

改进Android代码:

private void requestData(){

    RestAdapter adapter=new RestAdapter.Builder()
    .setEndpoint(ENDPOINT)
    .build();

    WordsAPI api=adapter.create(WordsAPI.class);

    api.getRestWordFeed(new Callback<List<Word>>(){

            @Override
            public void failure(RetrofitError arg0) {
                // TODO Auto-generated method stub
                Log.v("error",arg0.getMessage());
            }

            @Override
            public void success(List arg0, Response arg1) {
                // TODO Auto-generated method stub  
                wordList=arg0;
                printList();                    
            }
    });

}

API接口:

package com.example.testretrofitlib;

import java.util.List;

import retrofit.Callback;
import retrofit.http.GET;

public interface WordsAPI { 

    @GET("/rest_words/index.json")
    public void getRestWordFeed(Callback<List<Word>> response);


}

2 个答案:

答案 0 :(得分:3)

您的JSON是一个具有一个属性的对象:'words',它是一个word对象数组。您的错误:“预期BEGIN_ARRAY但是BEGIN_OBJECT”表示您正在等待数组,但返回了一个对象。一种解决方案是将以下内容作为json返回:

[
    {
        "id": "1",
        "word": "submarine",
        "word_syllables": "sub-mar-ine",
        "picture": "none.jpg",
        "picture_dir": "",
        "soundfile": "",
        "user_id": "1",
        "created": "2015-04-08 16:32:07",
        "modified": "0000-00-00 00:00:00"
    },
    {
        "id": "2",
        "word": "computer",
        "word_syllables": "com-pute-r",
        "picture": "computer.jpg",
        "picture_dir": "",
        "soundfile": "",
        "user_id": "0",
        "created": "2015-04-08 16:32:07",
        "modified": "0000-00-00 00:00:00"
    }
]

答案 1 :(得分:2)

该JSON的单词对象列表嵌入在具有“words”属性的对象的值内。该错误只是指出,它期待一个数组定界符[,而不是找到该对象的开头。

您可以修复JSON(删除{"words": <ACTUAL_ARRAY> }并只保留带有两个元素的数组)或修改您在getRestWordFeed中期望的数据结构。