问题
I don't know how to parse json using retrofit. Am familiar with parsing simple json using Retrofit but am not familiar with parsing nested Json using Retrofit.
Here is my Json data.................
{
"current_observation": {
"image": {
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
},
{
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
}
}
}
}
Any help will be appreciated. Thank you.
This is my method for simple json
public class Country {
@SerializedName("current_observation")
@Expose
private List<Items> items;
public List<Items> getItems() {
return items;
}
public void setItems (List<Items> items) {
this.items = items;
}
}
Here comes.....
public class Items {
@SerializedName("image")
@Expose
private String url;
private String title;
private String link;
public String getFlag() {
return url;
}
public String getRank() {
return link;
}
public void setRank(String link) {
this.link = link;
}
public void setFlag(String url) {
this.url = url;
}
public String getCountryname() {
return title;
}
public void setCountryname(String rating) {
this.title = rating;
}
}
Code in Main Activity
Call <Country> call = apiInterface.getCountries();
call.enqueue(new Callback <Country>() {
@Override
public void onResponse(Call<Country> call, Response<Country> response) {
Log.d(TAG,"onSuccess Server Response "+ response.toString());
Log.d(TAG,"onSuccess received information "+ response.body().toString());
List<Items> items = response.body().getItems();
adapter = new RecAdapter(items, getContext().getApplicationContext());
recyclerView.setAdapter(adapter);
}
回答1:
CurrentObservation.class
public class CurrentObservation {
@SerializedName("image")
@Expose
private Image1 image;
public Image1 getImage() {
return image;
}
public void setImage(Image1 image) {
this.image = image;
}
}
Example.java
public class Example {
@SerializedName("current_observation")
@Expose
private CurrentObservation currentObservation;
public CurrentObservation getCurrentObservation() {
return currentObservation;
}
public void setCurrentObservation(CurrentObservation currentObservation) {
this.currentObservation = currentObservation;
}
}
Image1.java
public class Image1 {
@SerializedName("url")
@Expose
private String url;
@SerializedName("title")
@Expose
private String title;
@SerializedName("link")
@Expose
private String link;
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
}
To call it in main Activity
Call<Example> ex = BaseUrlClass.getInterface().ex("whatever parameters");
ex.enqueue(new Callback<Example>() {
@Override
public void onResponse(Call<Example> call, Response<Example> response) {
Example list = response.body();
CurrentObservation a = list.getCurrentObservation();
List<Image1> im = a.getImage();
for (int i = 0;i<im.size();i++){
Image1 image1= im.get(i);
String a = image1.getTitle();
String b = image1.getUrl();
String c = image1.getLink();
}
}
@Override
public void onFailure(Call<Example> call, Throwable t) {
}
});
Lastly in your Interface
public interface ApiUtils {
@GET("") //whatever url
Call<Example> ex(); //or any parameter
}
回答2:
Use below Response class in Retrofit
class Response{
@SerializedName("current_observation")
Observation observation;
//getters and setters
}
class Observation{
@SerializedName("image")
Image image;
//getters and setters
}
class Image{
@SerializedName("title")
String title;
@SerializedName("link")
String link;
@SerializedName("url")
String url;
//getters and setters
}
回答3:
This will be easier if you implement the Pojo correctly.
There are a conflict in your class and your json.
From your Country class, "current_observation" will be List<Items> items;
Then your json should be like this:
"current_observation":[
{
"image": {
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
}
},
{
"image": {
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
}
}]
Take note at the square bracket [] in case of using List. Even if only 1 item, your "current_observation" still need to have this to declare for List<T>.
I suggest you use this website: http://www.jsonschema2pojo.org/
Choose Source Type: JSON, Annotation style: Moshi (I'm using Moshi, or you can use Gson), Tick on: Make class serialiable
It will generate the correct Class for your json. The rest of your code should be correct already.
UPDATE: If after generating the class, there is no List generated, you should not use
List<Items> items = response.body().getItems();
but instead
Items items = response.body().getItems();
回答4:
For JSON Parsing you should use JASONSCHEMA2POJO convert JSON String to model class
inside your retrofit success response
CurrentObservation observation = new CurrentObservation ();
JSONObject jsonObject = new JSONObject(response.body().string());
observation = new Gson().fromJson(jsonObject.getString("current_observation"),CurrentObservation .class);
Model Class Like
public class Example {
@SerializedName("current_observation")
@Expose
private CurrentObservation currentObservation;
public CurrentObservation getCurrentObservation() {
return currentObservation;
}
public void setCurrentObservation(CurrentObservation currentObservation) {
this.currentObservation = currentObservation;
}
}
回答5:
How can i call it in main activity?
you need to call pojo class method like this
String url=getCurrentObservation().getImage().getUrl();
if you get from response
String url=response.body().getCurrentObservation().getImage().getUrl();
for more help retrofit follow this link with my ans
回答6:
i looked at your Json String in detail. just look at your "image" key followed by a JSONObject.
{
"current_observation": {
"image": {
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
},
{
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
}
}
}
since your "image" key has multiple values, it should be inside the JSONArray. so your String should look like
{
"current_observation": {
"image": [{
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
},
{
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
}
]
}
}
I suggest you should check your String again.
来源：https://stackoverflow.com/questions/48580144/how-to-parse-nested-json-using-retrofit