如何循环通过Json数组，直到id等于某个数字？

Question

这是我的Json，如果musicVideo id = 303或其他一些数字

，我要做的就是获取aboutAboutTheVideo数组

  {  
       musicVideos:[  
          {  
             id:303,
             youtubeVideoUrl:"https://www.youtube.com/watch?v=cvvcbcv",
             prettyVideoTitle:"Pretty Title",
             youtubeVideoTitle:"Crap Title",
             youtubeThumbnail:"https://image.com",
             thingsAboutTheVideo:[  
                {  
                   id:368,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:538,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:539,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:540,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                }
             ]
          },
          {  
             id:302,
             youtubeVideoUrl:"https://www.youtube.com/watch?v=",
             prettyVideoTitle:"Tcbcvbcv",
             youtubeVideoTitle:"xcvcx",
             youtubeThumbnail:"http://www.google.com/image",
             thingsAboutTheVideo:[  
                {  
                   id:64,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:535,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:536,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:537,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:541,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                },
                {  
                   id:542,
                   name:"Some Name",
                   facebook:"",
                   twitter:"",
                   instagram:"",
                   imdb:"",
                   website:"",
                   info:"",
                   image:"",
                   time:""
                }
             ]
          }
       }

这就是我现在所拥有的

for(int 1 = 0; i<jsonObject.length(); i++){
    JsonObject ob = jsonObject.getJsonObject(i);
    JSONArray aboutVideo = ob.getJsonArray("thingsAboutTheVideo");
    for(int j = 0 <aboutVideo.length(); j++){
        JsonObject objectTwo = aboutVideo.getJsonObject(j);
    }
}

哪种类型有效，但是当我试图获得第二个时它没有显示任何内容，如果我添加id == 303则应用程序崩溃如果显示什么都不知道我做错了什么

Answer 1

for循环的入口点在哪里？什么＆＃39; jsonObject.length()？我怀疑它是在第一个musicVideos数组索引内开始的。这意味着你只能获得那个对象的信息。无论如何，从头开始，希望它提供一些见解（使用org.json）：

//content is a String containing the JSON Object you posted here (with an extra ]).    
JSONArray musicVideosArray = new JSONObject(content).getJSONArray("musicVideos"); //We are only interested in the array
for (int i = 0; i < musicVideosArray.length(); i++) { //For each object in the array
    JSONObject musicVideo  = musicVideosArray.getJSONObject(i);
    //You can already retrieve ID's here if that's all you're interested in:
    //int musicVideoID = musicVideo.getInt("id");
    //if (musicVideoID == 303) {//Do whatever}
    JSONArray aboutTheVideoArray = musicVideo.getJSONArray("thingsAboutTheVideo"); //Get the 'things' array containing ID's
    for (int j = 0; j < aboutTheVideoArray.length(); j++) {
        JSONObject aboutTheVideo = aboutTheVideoArray.getJSONObject(j);
        System.out.println("Object " + (j+1) + " of parent object "  + (i+1) + ", ID: " + aboutTheVideo.getInt("id"));
        //Do whatever
    }
}

我还要注意，您在此处发布的JSON对象并不完全有效，您缺少]字符来关闭musicVideos数组。