我无法找到这个问题的详细答案,或者至少没有找到我能理解的答案.
我正在尝试设置Volley来从iTunes中下载JSON对象.然后我想解析对象,以获取他们的图像URL.
例如,这是iTunes JSON对象URL
String url = "https://itunes.apple.com/search?term=michael+jackson";
String url = "https://itunes.apple.com/search?term=michael+jackson";
JsonObjectRequest jsonRequest = new JsonObjectRequest
(Request.Method.GET,url,null,new Downloader.Response.Listener // Cannot resolve symbol Listener
<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// the response is already constructed as a JSONObject!
try {
response = response.getJSONObject("args");
String site = response.getString("site"),network = response.getString("network");
System.out.println("Site: "+site+"\nNetwork: "+network);
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Downloader.Response.ErrorListener // Cannot resolve symbol ErrorListener
() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
Volley.newRequestQueue(this).add(jsonRequest);
最后一句话是
Volley.newRequestQueue(this).add(jsonRequest);
据推测,我现在有JSON对象？但是我如何访问和解析它？
解决方法
使用您的Url,您可以使用以下示例代码：
RequestQueue requestQueue = Volley.newRequestQueue(this);
String url = "https://itunes.apple.com/search?term=michael+jackson";
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url,new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
if (response != null) {
int resultCount = response.optInt("resultCount");
if (resultCount > 0) {
Gson gson = new Gson();
JSONArray jsonArray = response.optJSONArray("results");
if (jsonArray != null) {
SongInfo[] songs = gson.fromJson(jsonArray.toString(),SongInfo[].class);
if (songs != null && songs.length > 0) {
for (SongInfo song : songs) {
Log.i("LOG",song.trackViewUrl);
}
}
}
}
}
}
},new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("LOG",error.toString());
}
});
requestQueue.add(jsonObjectRequest);
SongInfo类：
public class SongInfo {
public String wrapperType;
public String kind;
public Integer artistId;
public Integer collectionId;
public Integer trackId;
public String artistName;
public String collectionName;
public String trackName;
public String collectionCensoredName;
public String trackCensoredName;
public String artistViewUrl;
public String collectionViewUrl;
public String trackViewUrl;
public String previewUrl;
public String artworkUrl30;
public String artworkUrl60;
public String artworkUrl100;
public Float collectionPrice;
public Float trackPrice;
public String releaseDate;
public String collectionExplicitness;
public String trackExplicitness;
public Integer discCount;
public Integer discNumber;
public Integer trackCount;
public Integer trackNumber;
public Integer trackTimeMillis;
public String country;
public String currency;
public String primaryGenreName;
public String radioStationUrl;
public Boolean isStreamable;
}
在build.gradle文件中：
compile 'com.mcxiaoke.volley:library:1.0.19' compile 'com.google.code.gson:gson:2.5'
希望这可以帮助！
