在Android上使用翻新的JSON响应 [英] JSON Response Using Retrofit on Android
问题描述
我能够使用OkHttp3获得JSON响应，并且我想使用Retrofit来解析响应以从中获取名称和图像.我查看了Retrofit网站和一些教程，但过程仍然不清楚.
I'm able to get JSON response using OkHttp3, and I want to use Retrofit to parse the response to get the name and the image from it. I looked into Retrofit website and some tutorials, but still the process not clear.
这是我的OkHttp3代码，用于获取JSON响应:
Here is my OkHttp3 code to get JSON response:
Request request = new Request.Builder().url(url).build();
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);
Headers responseHeaders = response.headers();
for (int i = 0, size = responseHeaders.size(); i < size; i++) {
System.out.println(responseHeaders.name(i) + responseHeaders.value(i));
}
System.out.println(response.body().string());
String jData = response.body().string();// I want to parse jData using Retrofit
}
});
JSON响应如下:
我想获取每个艺术家的姓名，身份证和图像，对我们的帮助将不胜感激.
I want to get the name, id, and the image of each artist, any help is greatly appreciated.
更新
我添加了Pojo类，其中一个是Item类:
I added Pojo classes one of them is Item class:
public class Item {
@SerializedName("external_urls")
@Expose
private ExternalUrls externalUrls;
@SerializedName("followers")
@Expose
private Followers followers;
@SerializedName("genres")
@Expose
private List<Object> genres = new ArrayList<Object>();
@SerializedName("href")
@Expose
private String href;
@SerializedName("id")
@Expose
private String id;
@SerializedName("images")
@Expose
private List<Object> images = new ArrayList<Object>();
@SerializedName("name")
@Expose
private String name;
@SerializedName("popularity")
@Expose
private Integer popularity;
@SerializedName("type")
@Expose
private String type;
@SerializedName("uri")
@Expose
private String uri;
/**
*
* @return
* The externalUrls
*/
public ExternalUrls getExternalUrls() {
return externalUrls;
}
/**
*
* @param externalUrls
* The external_urls
*/
public void setExternalUrls(ExternalUrls externalUrls) {
this.externalUrls = externalUrls;
}
/**
*
* @return
* The followers
*/
public Followers getFollowers() {
return followers;
}
/**
*
* @param followers
* The followers
*/
public void setFollowers(Followers followers) {
this.followers = followers;
}
/**
*
* @return
* The genres
*/
public List<Object> getGenres() {
return genres;
}
/**
*
* @param genres
* The genres
*/
public void setGenres(List<Object> genres) {
this.genres = genres;
}
/**
*
* @return
* The href
*/
public String getHref() {
return href;
}
/**
*
* @param href
* The href
*/
public void setHref(String href) {
this.href = href;
}
/**
*
* @return
* The id
*/
public String getId() {
return id;
}
/**
*
* @param id
* The id
*/
public void setId(String id) {
this.id = id;
}
/**
*
* @return
* The images
*/
public List<Object> getImages() {
return images;
}
/**
*
* @param images
* The images
*/
public void setImages(List<Object> images) {
this.images = images;
}
/**
*
* @return
* The name
*/
public String getName() {
return name;
}
/**
*
* @param name
* The name
*/
public void setName(String name) {
this.name = name;
}
/**
*
* @return
* The popularity
*/
public Integer getPopularity() {
return popularity;
}
/**
*
* @param popularity
* The popularity
*/
public void setPopularity(Integer popularity) {
this.popularity = popularity;
}
/**
*
* @return
* The type
*/
public String getType() {
return type;
}
/**
*
* @param type
* The type
*/
public void setType(String type) {
this.type = type;
}
/**
*
* @return
* The uri
*/
public String getUri() {
return uri;
}
/**
*
* @param uri
* The uri
*/
public void setUri(String uri) {
this.uri = uri;
}
}
这是我在活动中使用Retrofit的方式:
Here how I'm using Retrofit in my activity:
private void loadJSON() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://api.spotify.com")
.addConverterFactory(GsonConverterFactory.create())
.build();
final Artists_Interface request = retrofit.create(Artists_Interface.class);
Call<Item> call = request.getArtists();
call.enqueue(new Callback<Item>() {
@Override
public void onResponse(Call<Item> call, Response<Item> response) {
if(response.isSuccessful()){
Item artist = response.body();
System.out.println("THE NAME::::. : " + artist.getName());
}
else{
System.out.println(" :::. NOO RESPONSE .::: " );
}
}
@Override
public void onFailure(Call<Item> call, Throwable t) {
System.out.println("onFAIL::: " + t);
}
});
这里是改造界面的样子:
And here how the retrofit interface look like:
public interface Artists_Interface {
@GET("/v1/search?q=Beyonce&type=artist")
Call<Item> getArtists();
}
我得到artist.getName()等于null.我需要输入JSON正文中项目"内的名称，id和图像，并将它们传递给listView或recyclerView适配器
I get artist.getName() equals null. I need to get into name, id, and images that are inside "items" in JSON body and pass them to listView or recyclerView adapter
推荐答案
感谢所有人，感谢所有答案.由于Retrofit的文档不多，而且一些答案不够详细，无法接受，因此我设法通过拼凑起来解决了问题.我想从此链接的JSON响应中提取数据: https://api .spotify.com/v1/search?q = Beyonce& type = artist
I appreciate all answers, thanks to everyone. I managed to solve the problem by putting pieces together since Retrofit has poor documentation, and some answers aren't detailed enough to be accepted. I wanted to extract data from JSON response from this link: https://api.spotify.com/v1/search?q=Beyonce&type=artist
第1步: 创建一个Pojo类以反序列化响应中的项目.反序列化基本上意味着在此JSON响应中，我们有"artists"数组，并且在其中包含"href"字符串和"items"列表，因此正如Aritra建议的那样，我们可以使用
Step1: Create a Pojo class to deserialize the items in the response. deserializing basically means that in this JSON response, we have "artists" array and inside it "href" string and "items" list, so as Aritra suggested, we can use http://www.jsonschema2pojo.org to generate the pojo classes that will deserialize these items for us. Here how mine look like after some modification:
public class Data implements Serializable{
@SerializedName("artists")
Artists artists;
public Artists getArtists() {
return artists;
}
public static class Artists {
@SerializedName("href")
private String href;
@SerializedName("items")
private List<Item> items;
public String getHref(){
return href;
}
public List<Item> getItems(){
return items;
}
}// Artists
public static class Item {
// You have your item class here
@SerializedName("external_urls")
@Expose
private ExternalUrls externalUrls;
@SerializedName("followers")
@Expose
private Followers followers;
@SerializedName("genres")
@Expose
private List<Object> genres = new ArrayList<Object>();
@SerializedName("href")
@Expose
private String href;
@SerializedName("id")
@Expose
private String id;
@SerializedName("images")
@Expose
private List<Object> images = new ArrayList<Object>();
@SerializedName("name")
@Expose
private String name;
@SerializedName("popularity")
@Expose
private Integer popularity;
@SerializedName("type")
@Expose
private String type;
@SerializedName("uri")
@Expose
private String uri;
public Item() {
name = "";
id = "";
images = new ArrayList<>();
}
/**
* @return The externalUrls
*/
public ExternalUrls getExternalUrls() {
return externalUrls;
}
/**
* @param externalUrls The external_urls
*/
public void setExternalUrls(ExternalUrls externalUrls) {
this.externalUrls = externalUrls;
}
/**
* @return The followers
*/
public Followers getFollowers() {
return followers;
}
/**
* @param followers The followers
*/
public void setFollowers(Followers followers) {
this.followers = followers;
}
/**
* @return The genres
*/
public List<Object> getGenres() {
return genres;
}
/**
* @param genres The genres
*/
public void setGenres(List<Object> genres) {
this.genres = genres;
}
/**
* @return The href
*/
public String getHref() {
return href;
}
/**
* @param href The href
*/
public void setHref(String href) {
this.href = href;
}
/**
* @return The id
*/
public String getId() {
return id;
}
/**
* @param id The id
*/
public void setId(String id) {
this.id = id;
}
/**
* @return The images
*/
public List<Object> getImages() {
return images;
}
/**
* @param images The images
*/
public void setImages(List<Object> images) {
this.images = images;
}
/**
* @return The name
*/
public String getName() {
return name;
}
/**
* @param name The name
*/
public void setName(String name) {
this.name = name;
}
/**
* @return The popularity
*/
public Integer getPopularity() {
return popularity;
}
/**
* @param popularity The popularity
*/
public void setPopularity(Integer popularity) {
this.popularity = popularity;
}
/**
* @return The type
*/
public String getType() {
return type;
}
/**
* @param type The type
*/
public void setType(String type) {
this.type = type;
}
/**
* @return The uri
*/
public String getUri() {
return uri;
}
/**
* @param uri The uri
*/
public void setUri(String uri) {
this.uri = uri;
}
}// Item
}
因此，表示为Artists类的数组"artists"包含href字符串和项目列表元素，所有元素都已序列化以匹配JSON响应.项目列表的类型为Item类，其中包含许多序列化的元素，例如id，名称，图像等.所有这些元素都已序列化以实现JSON响应.
So, the array "artists" represented as Artists class that contains href String and items list elements all serialized to match the JSON response. The items list is of type Item class, which contains many serialized elements, like id, name, images.. etc. all serialized to mach the JSON response.
第二步: 网址分为2个部分，一个基本部分和一个端点.创建Retrofit2请求时，将使用基础.我从onCreate方法调用此请求:
Step2: The url is divided into 2 parts, a base and an endpoint. We use the base when we create Retrofit2 request. I'm calling this request from onCreate method:
private void loadJSON() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://api.spotify.com")
.addConverterFactory(GsonConverterFactory.create())
.build();
final Artists_Interface request = retrofit.create(Artists_Interface.class);
Call<Data> call = request.getArtists();
call.enqueue(new Callback<Data>() {
@Override
public void onResponse(Call<Data> call, Response<Data> response) {
if (response.isSuccessful()) {
System.out.println(" Href ::::. : " + response.body().getArtists().getHref());
List<Data.Item> items = response.body().getArtists().getItems();
for (int i = 0; i < items.size(); i++) {
adapter.addArtist(items.get(i));
}
}
else { System.out.println(" :::. NO RESPONSE .::: "); }
}// End onResponse
@Override
public void onFailure(Call<Data> call, Throwable t) {
System.out.println("onFAIL::: " + t);
}
});
然后，我们在Retrofit2接口类中使用端点:
Then, we use the endpoint in the Retrofit2 interface class:
public interface Artists_Interface {
@GET("/v1/search?q=Beyonce&type=artist")
Call<Data> getArtists();
}
第3步: 只需将我们从响应中获得的值分配给视图中的元素即可.在第二步中，我将项目列表分配给了我的recyclerView适配器，因此这里的适配器是这样的:
Step3: Just assign the values we got from the response to the elements in our views. In step two I assigned the items list to the my recyclerView adapter, so here how my adapter look like:
public class Artists_Adapter extends RecyclerView.Adapter<Artists_Adapter.ViewHolder> {
private ArrayList<Data.Item> artists;
public Artists_Adapter(ArrayList<Data.Item> artists) {
this.artists = artists;
}
@Override
public Artists_Adapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_artists, viewGroup, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(Artists_Adapter.ViewHolder viewHolder, int i) {
viewHolder.name.setText(artists.get(i).getName());
}
@Override
public int getItemCount() {
if(artists == null){
return 0;
}
else {
return artists.size();
}
}
public void addArtist(Data.Item item){
artists.add(item);
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView name ;
private ImageView imageView;
public ViewHolder(View view) {
super(view);
name = (TextView)view.findViewById(R.id.name);
imageView = (ImageView) view.findViewById(R.id.image);
}
}
}
这是我的onCreate()方法的样子:
And here how my onCreate() method look like:
private RecyclerView recyclerView;
private ArrayList<Data.Item> data = new ArrayList<>();
private Artists_Adapter adapter;
static Context ctx;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
ctx = this;
url = "https://api.spotify.com/v1/search?q=Beyonce&type=artist";
loadJSON();
initViews();
}// onCreate
private void initViews() {
recyclerView = (RecyclerView) findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(layoutManager);
adapter = new Artists_Adapter(data);
recyclerView.setAdapter(adapter);
}
这篇关于在Android上使用翻新的JSON响应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！
