解析具有多个Android级别的JSON对象 [英] Parse JSON object with multiple levels Android
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问题描述
我知道这已经被问过很多次了，我已经阅读了几十个问题和答案，但是由于某种原因我无法使我的代码正常工作，所以请不要关闭此问题.这是我的http get请求返回的JSON对象:
I know this has been asked many times before, I have read through dozens of questions and answers but for some reason I can't get my code to work so please don't close this question. Here is the JSON object that my http get request returns:
{
"tracks" : {
"href" : "https://api.spotify.com/v1/search?query=Closer&offset=0&limit=20&type=track",
"items" : [ {
"album" : {
"album_type" : "single",
"artists" : [ {
"external_urls" : {
"spotify" : "https://open.spotify.com/artist/69GGBxA162lTqCwzJG5jLp"
},
"href" : "https://api.spotify.com/v1/artists/69GGBxA162lTqCwzJG5jLp",
"id" : "69GGBxA162lTqCwzJG5jLp",
"name" : "The Chainsmokers",
"type" : "artist",
"uri" : "spotify:artist:69GGBxA162lTqCwzJG5jLp"
} ],
"available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TR", "TW", "US", "UY" ],
"external_urls" : {
"spotify" : "https://open.spotify.com/album/0rSLgV8p5FzfnqlEk4GzxE"
},
"href" : "https://api.spotify.com/v1/albums/0rSLgV8p5FzfnqlEk4GzxE",
"id" : "0rSLgV8p5FzfnqlEk4GzxE",
"images" : [ {
"height" : 640,
"url" : "https://i.scdn.co/image/512bd22e2bc73f9883b8612daf4f23acaac3c776",
"width" : 640
}, {
"height" : 300,
"url" : "https://i.scdn.co/image/2e244b9284d317b2019bb9fd44d9a086210d4974",
"width" : 300
}, {
"height" : 64,
"url" : "https://i.scdn.co/image/57ba46d39d710e99ae524b279cae3a3981ace43f",
"width" : 64
} ],
"name" : "Closer",
"type" : "album",
"uri" : "spotify:album:0rSLgV8p5FzfnqlEk4GzxE"
},
"artists" : [ {
"external_urls" : {
"spotify" : "https://open.spotify.com/artist/69GGBxA162lTqCwzJG5jLp"
},
"href" : "https://api.spotify.com/v1/artists/69GGBxA162lTqCwzJG5jLp",
"id" : "69GGBxA162lTqCwzJG5jLp",
"name" : "The Chainsmokers",
"type" : "artist",
"uri" : "spotify:artist:69GGBxA162lTqCwzJG5jLp"
}, {
"external_urls" : {
"spotify" : "https://open.spotify.com/artist/26VFTg2z8YR0cCuwLzESi2"
},
"href" : "https://api.spotify.com/v1/artists/26VFTg2z8YR0cCuwLzESi2",
"id" : "26VFTg2z8YR0cCuwLzESi2",
"name" : "Halsey",
"type" : "artist",
"uri" : "spotify:artist:26VFTg2z8YR0cCuwLzESi2"
} ],
"available_markets" : [ "AD", "AR", "AT", "AU", "BE", "BG", "BO", "BR", "CA", "CH", "CL", "CO", "CR", "CY", "CZ", "DE", "DK", "DO", "EC", "EE", "ES", "FI", "FR", "GB", "GR", "GT", "HK", "HN", "HU", "ID", "IE", "IS", "IT", "JP", "LI", "LT", "LU", "LV", "MC", "MT", "MX", "MY", "NI", "NL", "NO", "NZ", "PA", "PE", "PH", "PL", "PT", "PY", "SE", "SG", "SK", "SV", "TR", "TW", "US", "UY" ],
"disc_number" : 1,
"duration_ms" : 244960,
"explicit" : false,
"external_ids" : {
"isrc" : "USQX91601347"
},
"external_urls" : {
"spotify" : "https://open.spotify.com/track/7BKLCZ1jbUBVqRi2FVlTVw"
},
"href" : "https://api.spotify.com/v1/tracks/7BKLCZ1jbUBVqRi2FVlTVw",
"id" : "7BKLCZ1jbUBVqRi2FVlTVw",
"name" : "Closer",
"popularity" : 100,
"preview_url" : "https://p.scdn.co/mp3-preview/8d3df1c64907cb183bff5a127b1525b530992afb?cid=null",
"track_number" : 1,
"type" : "track",
"uri" : "spotify:track:7BKLCZ1jbUBVqRi2FVlTVw"
}, {
从底部开始的8行是我想要的信息，id:7BKLCZ1jbUBVqRi2FVlTVw.这是我当前正在使用的Java代码，后面是返回的内容:
8 lines up from the bottom is the information that I want, the id: 7BKLCZ1jbUBVqRi2FVlTVw. Here is my java code I am currently using, followed by what it returns:
JSONObject jObj;
JSONObject tracks;
JSONArray items;
JSONObject id;
jObj = new JSONObject(json); // json is the JSON string
tracks = (JSONObject) jObj.get("tracks");
items = (JSONArray) tracks.get("items");
id = items.getJSONObject(9); // index 9 because the id is the 10th child in the structure.
Log.d("testJson", id.toString());
这是它返回的内容(很抱歉，它的格式不正确):
This is what it returns (sorry it comes out not formatted nicely):
{"album":{"album_type":"album","artists":[{"external_urls":{"spotify":"https:\/\/open.spotify.com\/artist\/6MxlVTY6PmY8Nyn16fvxtb"},"href":"https:\/\/api.spotify.com\/v1\/artists\/6MxlVTY6PmY8Nyn16fvxtb","id":"6MxlVTY6PmY8Nyn16fvxtb","name":"Slightly Stoopid","type":"artist","uri":"spotify:artist:6MxlVTY6PmY8Nyn16fvxtb"}],"available_markets":["CA","US"],"external_urls":{"spotify":"https:\/\/open.spotify.com\/album\/5FWZm9haAG0NhY6WmdS4oW"},"href":"https:\/\/api.spotify.com\/v1\/albums\/5FWZm9haAG0NhY6WmdS4oW","id":"5FWZm9haAG0NhY6WmdS4oW","images":[{"height":640,"url":"https:\/\/i.scdn.co\/image\/99614be452418aa67f429a4f16c0da7c38003481","width":640},{"height":300,"url":"https:\/\/i.scdn.co\/image\/70fa9db3e76ba2203110ae78667074ab3e9c89fa","width":300},{"height":64,"url":"https:\/\/i.scdn.co\/image\/fe326958674bb30385fa180b57bff3b8bc0d5080","width":64}],"name":"Closer to the Sun","type":"album","uri":"spotify:album:5FWZm9haAG0NhY6WmdS4oW"},"artists":[{"external_urls":{"spotify":"https:\/\/open.spotify.com\/artist\/6MxlVTY6PmY8Nyn16fvxtb"},"href":"https:\/\/api.spotify.com\/v1\/artists\/6MxlVTY6PmY8Nyn16fvxtb","id":"6MxlVTY6PmY8Nyn16fvxtb","name":"Slightly Stoopid","type":"artist","uri":"spotify:artist:6MxlVTY6PmY8Nyn16fvxtb"}],"available_markets":["CA","US"],"disc_number":1,"duration_ms":145560,"explicit":false,"external_ids":{"isrc":"US74G0560417"},"external_urls":{"spotify":"https:\/\/open.spotify.com\/track\/1UL8GkVAs6UcWF6BZ3DYZt"},"href":"https:\/\/api.spotify.com\/v1\/tracks\/1UL8GkVAs6UcWF6BZ3DYZt","id":"1UL8GkVAs6UcWF6BZ3DYZt","name":"Closer to the Sun","popularity":59,"preview_url":"https:\/\/p.scdn.co\/mp3-preview\/1d049a0243ef1286e7a237b9236801a3c8367a19?cid=null","track_number":17,"type":"track","uri":"spotify:track:1UL8GkVAs6UcWF6BZ3DYZt"}
我想知道为什么它返回所有这些信息，但不返回歌曲本身的ID?我该怎么做呢?谢谢
I am wondering why it returns all of this information, but not the id for the song itself? How do I do this? Thanks
推荐答案
items是一个对象数组...因此，items.getJSONObject(9)返回第10个项目，该项目是一个持有属性名称的对象"id"...
items is an array of objects... so, items.getJSONObject(9) is returning the 10-th item which is an object that hold an attribute name "id"...
要获得ID，您还需要类似以下内容:
In other to get the Id, you will need something like this:
JSONObject jObj;
JSONObject tracks;
JSONArray items;
String id;
jObj = new JSONObject(json); // json is the JSON string
tracks = (JSONObject) jObj.get("tracks");
items = (JSONArray) tracks.get("items");
id = items.getJSONObject(9).getString("id");
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