数组内的Json数组检索Android值 [英] Json array inside array retrieve values Android

问题描述

我试图从数组内的JSONArray中获取值，因此我能够将整个JSON值成功检索到JSONArray中，但无法在JSONArray中获取值.当我将JSONArray转换为JSONObject以获取存储在JSONArray内部的值时.它给出了错误:org.json.JSONException: No value for "banner"

i m trying to get values from JSONArray inside array, i m able to retrieve whole JSON values into JSONArray successfully but not able to retrieve values inside JSONArray. When i convert JSONArray to JSONObject to get values stored inside JSONArray. It gives error: org.json.JSONException: No value for "banner"

这是JSON代码，我使用 jsonlint.com 验证了JSON代码，并显示JSON为Validate，

Here is JSON code, i verified JSON code with jsonlint.com and it showed JSON is Validate,

[
	{"code":"banner","moduletitle":0,
	  "banner":
		[
			{"image":"http://imageurl"},
			{"image":"http://imageurl"},
			{"image":"http://imageurl"}
		]
		
	}
]

我想从3小时内拿到这个，但没有运气.我是JSON的新手，不知道JSON的实际工作原理，还阅读了 GSON库以获得JSON值.这是我的Java代码.

I m trying to get this from 3 hour but no luck. i m new in JSON and do not know how JSON Actually work, and also read abut GSON Library to get JSON values. here is My Java code.

  JSONArray jsonObj = null;
            String image_url = "";
            String banner_code ="";

            try {
                jsonObj =new JSONArray(lib_function.getJSONUrl( jsontags.Top_Banner_JOSN_URLs));
                Log.d("value retrun :","" +jsonObj);
              //---vlaue is coming and print in Log ----// 
              
            } catch (JSONException e) {
                Log.v("Error in Parser :", " " + e);
                Log.d("no value retrun :", "failed to convert");
            }

            try{
                    JSONObject jo = new JSONObject();
                    JSONArray ja = new JSONArray();
                    // populate the array
                    jo.put("arrayName", jsonObj);


                JSONArray subArray = jo.getJSONArray("banner");
                image_url= subArray.getString(Integer.parseInt("image"));


                Log.d("banner code",""+subArray);
            }catch(Exception e)
            {
                Log.d("not working",""+e);
            }

我遵循这个问题，但是很幸运: 如何在JSON数组中解析JSON数组Android

I folllow this question but luck: How to parse JSON Array inside another JSON Array in Android

如果有人建议，我会做错事情，将不胜感激.或让我知道，在哪里可以获得有关json的更多信息

If anyone suggest, what i m doing wrong will be appreciate. or let me know, where i can get more information about json

更新非常感谢大家给他们宝贵的时间来回答我的愚蠢问题.所有答案都是正确的，但我只能接受一个答案.非常感谢所有人

UPDATE thanks too all to give their precious time for answering my stupid question. All answers are correct , but i can accept only one answer. A Big thanks to all

推荐答案

此处:

JSONObject jo = new JSONObject();
JSONArray ja = new JSONArray();
// populate the array
jo.put("arrayName", jsonObj);

因为解析jsonObj JSONArray，所以无需创建新的JSONArray和JSONObject从jsonObj中提取它.删除上面三行.

Because parsing jsonObj JSONArray so no need to create new JSONArray and JSONObject to extract it from jsonObj. remove all above three lines.

banner JSONArray在JSONObject内，由jsonObj JSONArray包含，请获取为:

banner JSONArray is inside JSONObject which is contained by jsonObj JSONArray, get it as:

   JSONObject jsonObject=jsonObj.optJSONObject(0);
    JSONArray subArray = jsonObject.getJSONArray("banner");

   // get code key from `jsonObject`
   String strCode=jsonObject.optString("code");

   // get all images urls from `subArray`
    for(int index=0;index<subArray.length();index++){
      JSONObject imgJSONObject=subArray.optJSONObject(index);
      // get image urls
      String strImgURL=imgJSONObject.optString("image");

     } 

此外，如果jsonObj JSONArray包含多个JSONObject，则使用for-loop对其进行迭代.

Also, if jsonObj JSONArray contains multiple JSONObject's then use for-loop to iterate it.

这篇关于数组内的Json数组检索Android值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！