问题
I know how to receive arrays when they are this type:
[
{
"username": "luis",
"job": "developer",
"age": 23
}
]
my problem is when I must receive an array with a specific name like this:
{"result":[{"userid":"1","username":"Luis","job":"developer","age":"23"}]}
in this case I must receive the array above with the name "result" using retrofit2. Can anyone please help me I'm new at Retrofit.
This is what I have tried:
MainActivity
apiInterface = ApiClient.getApiClient().create(ApiInterface.class);
Call<List<Workers>> call = apiInterface.getWorkers();
call.enqueue(new Callback<List<Workers>>() {
@Override
public void onResponse(Call<List<Workers>> call, Response<List<Workers>> response) {
list=response.body();
adapter = new WorkerAdapter(getApplicationContext(),list);
recyclerView.setAdapter(adapter);
}
@Override
public void onFailure(Call<List<Workers>> call, Throwable t) {
}
});
ApiClient:
public class ApiClient {
public static final String BASE_URL="http://192.168.31.206/test1_database/";
public static Retrofit retrofit = null;
public static Retrofit getApiClient(){
if (retrofit==null){
retrofit=new Retrofit.Builder().baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create()).build();
}
return retrofit;
}
}
ApiInterface:
public interface ApiInterface {
@GET("getAllUser.php")
Call<List<Workers>> getWorkers();
}
my POJO or Workers class:
public class Workers {
@SerializedName("username")
String Name;
@SerializedName("job")
String Job;
@SerializedName("age")
int Age;
public String getName() {
return Name;
}
public String getJob() {
return Job;
}
public int getAge() {
return Age;
}
}
and finally my RecyclerAdpter:
public class WorkerAdapter extends RecyclerView.Adapter<WorkerAdapter.ViewHolder>{
Context context;
List<Workers> list;
public WorkerAdapter(Context context,List<Workers> list) {
this.context = context;
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item_recycler,parent,false);
ViewHolder holder = new ViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.name.setText(list.get(position).getName());
holder.job.setText(list.get(position).getJob());
holder.age.setText(String.valueOf(list.get(position).getAge()));
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView name, job, age;
public ViewHolder(View itemView) {
super(itemView);
name= (TextView) itemView.findViewById(R.id.nametxt);
job=(TextView) itemView.findViewById(R.id.jobtxt);
age=(TextView) itemView.findViewById(R.id.agetxt);
}
}
}
I've been stuck for two days now and I still can't solve it. Please help!
回答1:
create a class model called Result and in Interface class write this code:
@GET("your endpoint")
Call<Result>getResult();
and in Result class write below code:
@SerializedName("result")
private List<UserInfo> userInfo;
good luck.
回答2:
package com.example;
import java.util.List;
public class Example {
private List<Result> result = null;
public List<Result> getResult()
{
return result;
}
public void setResult(List<Result> result)
{
this.result = result;
}}
package com.example;
public class Result {
private String userid;
private String username;
private String job;
private String age;
public String getUserid()
{
return userid;
}
public void setUserid(String userid)
{
this.userid = userid;
}
public String getUsername()
{
return username;
}
public void setUsername(String username)
{
this.username = username;
}
public String getJob()
{
return job;
}
public void setJob(String job)
{
this.job = job;
}
public String getAge()
{
return age;
}
public void setAge(String age)
{
this.age = age;
}}
Make some model using this website. I have done these above code using this website.
Now, do this
@Get<"url">
call<Example> get()
回答3:
if you have to use this json format
{"result":[{"userid":"1","username":"Luis","job":"developer","age":"23"}]}
you have to create two models like this:
class Result {
@SerializedName("result")
@Expose
List<ResultDetail> result;
}
class ResultDetail {
@SerializedName("userid")
@Expose
String userId ;// use int instead
String username;
String job;
String age; // use int instead
}
add GsonConverterFactory to your app build.gradle
com.squareup.retrofit2:converter-gson:2.14
now build retrofit instance :
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("some base url like : www.example.com/api/")
.addConverterFactory(GsonConverterFactory.create())
.build();
YourSerivce service = retrofit.create(YourService.class);
interface YourService {
@GET("someThing") // complete url is www.example.com/api/someThing
Call<Result> getResult();
}
and finally get result like this :
retrofit.getResult().enqueue(.....)
回答4:
After a lot of testing guided by the 3 answers given and some video tutorial I finally figure it out.
ApiClient:
public class ApiClient {
private static final String BASE_URL="http://192.168.31.206/";
public static Retrofit retrofit = null;
public static ApiInterface instance=null;
public static Retrofit getApiClient(){
if (retrofit==null){
retrofit=new Retrofit.Builder().baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create()).build();
}
return retrofit;
}
public static ApiInterface getInterface(){
if (instance==null){
instance=getApiClient().create(ApiInterface.class);
}
return instance;
}
}
ApiInterface:
public interface ApiInterface {
//this could be test1_database/getAllUser.json
@GET("test1_database/getAllUser.php")
Call<Result> getWorkers();
}
Workers (POJO) class:
public class Workers {
@SerializedName("userid")
private String userid;
@SerializedName("username")
private String username;
@SerializedName("job")
private String job;
@SerializedName("age")
private String age;
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
Result (POJO) class:
public class Result {
@SerializedName("result")
private List<Workers> result = null;
public List<Workers> getResult() {
return result;
}
public void setResult(List<Workers> result) {
this.result = result;
}
}
MainActivity class:
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
List<Workers> list = new ArrayList<>();
WorkerAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recycler);
recyclerView.setHasFixedSize(true);
LinearLayoutManager manager = new LinearLayoutManager(this);
manager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(manager);
ApiInterface apiCall = ApiClient.getInterface();
Call<Result> call = apiCall.getWorkers();
call.enqueue(new Callback<Result>() {
@Override
public void onResponse(Call<Result> call, Response<Result> response) {
list = response.body().getResult();
adapter = new WorkerAdapter(MainActivity.this,list);
recyclerView.setAdapter(adapter);
}
@Override
public void onFailure(Call<Result> call, Throwable t) {
}
});
}}
I am Showing the results in a recyclerview using this adapter:
public class WorkerAdapter extends RecyclerView.Adapter<WorkerAdapter.ViewHolder>{
Context context;
List<Workers> list;
public WorkerAdapter(Context context,List<Workers> list) {
this.context = context;
this.list = list;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item_recycler,parent,false);
ViewHolder holder = new ViewHolder(v);
return holder;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.id.setText(String.valueOf(list.get(position).getUserid()));
holder.name.setText(list.get(position).getUsername());
holder.job.setText(list.get(position).getJob());
holder.age.setText(String.valueOf(list.get(position).getAge()));
}
@Override
public int getItemCount() {
return list.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView name, job, age,id;
public ViewHolder(View itemView) {
super(itemView);
id = (TextView) itemView.findViewById(R.id.idtxt);
name= (TextView) itemView.findViewById(R.id.nametxt);
job=(TextView) itemView.findViewById(R.id.jobtxt);
age=(TextView) itemView.findViewById(R.id.agetxt);
}
}
}
Thanks everyone for your help!
来源：https://stackoverflow.com/questions/52685409/how-to-receive-a-json-array-result-with-retrofit2