Response.body()在Android中使用Retrofit 2.0.2时返回一个具有null属性的对象 [英] Response.body() returns an object with null properties while using Retrofit 2.0.2 in Android
问题描述
response.body()
不会返回API的内容,但会返回此内容:
com.example.senolb.project.Downsized@e4bbc81
这是我的请求接口:
public interface ApiInterface {
@GET(search)
呼叫<缩小> getDownsized(@Query(api_key)字符串键,
@Query(fmt)字符串格式,
@Query(q)字符串类型,
@Query(limit )字符串限制);
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(http://api.giphy.com/v1/gifs/)
.addConverterFactory(GsonConverterFactory.create())
.build();
}
这是我的缩小班级:
@Generated(org.jsonschema2pojo)
公共类缩编{
@SerializedName(url)
@Expose
private String url;
@SerializedName(width)
@Expose
private String width;
@SerializedName(height)
@Expose
私人字符串高度;
@SerializedName(size)
@Expose
私人字符串大小;
// getter和setter方法低于
这是我在主页面的请求函数这会在我按下按钮时触发:
public void request(View view)throws IOException {
ApiInterface服务= ApiInterface.retrofit.create(ApiInterface.class);
呼叫<缩小> myDownsized = service.getDownsized(dc6zaTOxFJmzC,json,funny,1);
$ b myDownsized.enqueue(新回调<缩小>(){
@Override
public void onResponse(Call<缩小>调用,Response<缩小>响应){
if(response.isSuccessful()){
TextView text2 =(TextView)findViewById(R.id.first_text);
缩小尺寸dw = response.body();
text2.setText(dw.getHeight());
} else {
//不成功的响应
}
}
@覆盖
public void onFailure(Call< Downsized> call,Throwable t){
// failed response
}
});
我该怎么办?
你的问题是你没有正确解析返回的json api 。首先创建三个类来映射你的json数据:
第一类:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import java.util.ArrayList;
import java.util.List;
public class JsonResponse {
@SerializedName(data)
@Expose
private List< Data> dataList = new ArrayList<>();
公共列表< Data> getDataList(){
返回dataList;
$ / code $ / pre
第二类:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
公共类数据{
@SerializedName(图片)
@Expose
私人图片图片;
public Image getImages(){
return images;
}
}
第三课:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Image {
@SerializedName(缩小尺寸)
@Expose
私人缩小尺寸;
公开缩编getDownsized(){
返回缩小;
$ p 之后,改变你的界面使用 JsonResponse
class not 缩小
:
import retrofit2.Call;
进口retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
导入retrofit2.http.GET;
导入retrofit2.http.Query;
public interface ApiInterface {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(http://api.giphy.com/v1/gifs/)
.addConverterFactory(GsonConverterFactory.create())
.build();
@GET(搜索)
呼叫< JsonResponse> getDownsized(@Query(api_key)字符串键,
@Query(fmt)字符串格式,
@Query(q)字符串类型,
@Query(limit )字符串限制);
}
最后更改代码在 request()
方法中:
ApiInterface服务= ApiInterface.retrofit .create(ApiInterface.class);
呼叫< JsonResponse> myDownsized = service.getDownsized(dc6zaTOxFJmzC,json,funny,1);
$ b $ myDownsized.enqueue(new Callback< JsonResponse>(){
@Override
public void onResponse(Call< JsonResponse> call,Response< JsonResponse> response){$ b $如果(response.isSuccessful()){
for(Data data:response.body()。getDataList()){
System.out.println(data.getImages()。getDownsized()。 getUrl());
// TextView text2 =(TextView)findViewById(R.id.first_text);
//缩小尺寸dw = response.body();
//text2.setText (dw.getHeight());
}
} else {
//不成功的响应
}
}
@Override
public void onFailure(Call< JsonResponse> call,Throwable t){
// failed response
}
});
运行结果为:辛普森一家
response.body()
does not return content of the API but it returns this:
com.example.senolb.project.Downsized@e4bbc81
This is my interface for the request:
public interface ApiInterface {
@GET("search")
Call<Downsized> getDownsized(@Query("api_key") String key,
@Query("fmt") String format,
@Query("q") String type,
@Query("limit") String limit);
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://api.giphy.com/v1/gifs/")
.addConverterFactory(GsonConverterFactory.create())
.build();
}
This is my Downsized class:
@Generated("org.jsonschema2pojo")
public class Downsized {
@SerializedName("url")
@Expose
private String url;
@SerializedName("width")
@Expose
private String width;
@SerializedName("height")
@Expose
private String height;
@SerializedName("size")
@Expose
private String size;
// getter and setter methods below
And this is my request function at the main page which triggers when I push a button:
public void request(View view) throws IOException {
ApiInterface service = ApiInterface.retrofit.create(ApiInterface.class);
Call<Downsized> myDownsized = service.getDownsized("dc6zaTOxFJmzC","json","funny","1");
myDownsized.enqueue(new Callback<Downsized>() {
@Override
public void onResponse(Call<Downsized> call, Response<Downsized> response) {
if (response.isSuccessful()) {
TextView text2 = (TextView) findViewById(R.id.first_text);
Downsized dw = response.body();
text2.setText(dw.getHeight());
} else {
//unsuccessful response
}
}
@Override
public void onFailure(Call<Downsized> call, Throwable t) {
//failed response
}
});
What should I do?
解决方案 Your problem is that you're not parsing correctly the returned json from api. First of all create three more classes to map your json data:
First class:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
import java.util.ArrayList;
import java.util.List;
public class JsonResponse {
@SerializedName("data")
@Expose
private List<Data> dataList = new ArrayList<>();
public List<Data> getDataList() {
return dataList;
}
}
second class:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Data {
@SerializedName("images")
@Expose
private Image images;
public Image getImages() {
return images;
}
}
third class:
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;
public class Image {
@SerializedName("downsized")
@Expose
private Downsized downsized;
public Downsized getDownsized() {
return downsized;
}
}
After that change your interface to use JsonResponse
class not Downsized
:
import retrofit2.Call;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.GET;
import retrofit2.http.Query;
public interface ApiInterface {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://api.giphy.com/v1/gifs/")
.addConverterFactory(GsonConverterFactory.create())
.build();
@GET("search")
Call<JsonResponse> getDownsized(@Query("api_key") String key,
@Query("fmt") String format,
@Query("q") String type,
@Query("limit") String limit);
}
and finally change the code in your request()
method:
ApiInterface service = ApiInterface.retrofit.create(ApiInterface.class);
Call<JsonResponse> myDownsized = service.getDownsized("dc6zaTOxFJmzC", "json", "funny", "1");
myDownsized.enqueue(new Callback<JsonResponse>() {
@Override
public void onResponse(Call<JsonResponse> call, Response<JsonResponse> response) {
if (response.isSuccessful()) {
for (Data data : response.body().getDataList()) {
System.out.println(data.getImages().getDownsized().getUrl());
//TextView text2 = (TextView) findViewById(R.id.first_text);
//Downsized dw = response.body();
//text2.setText(dw.getHeight());
}
} else {
//unsuccessful response
}
}
@Override
public void onFailure(Call<JsonResponse> call, Throwable t) {
//failed response
}
});
After running the result is: simpsons
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