问题
None of the posts i found have helped me understand what im supposed to do. Stuck on this for quite a while so asking here. I want the List of IN and OUT names as "in" and "out" are json arrays. The error shows up as exception in OnFailure of response. getUsers() is in main activity.
private void getUsers() {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
APIInterface api = retrofit.create(APIInterface.class);
Call<List<In>> call1 = api.getInUsers();
call1.enqueue(new Callback<List<In>>() {
@Override
public void onResponse(Call<List<In>> call1, Response<List<In>> response) {
List<In> inUsers = response.body();
Log.v("InUsers",String.valueOf(inUsers));
data.add(new Vote(Vote.HEADER_TYPE,"IN"));
mAdapter.notifyDataSetChanged();
for(In vote : inUsers) {
data.add(new Vote(Vote.ITEM_TYPE,String.valueOf(vote)));
}
}
@Override
public void onFailure(Call<List<In>> call1, Throwable t) {
Toast.makeText(getActivity().getApplicationContext(), t.getMessage() + "IN LIST", Toast.LENGTH_LONG).show();
}
});
}
json is :
{
"message": "Hello World.",
"planData": {
"planId":"44444410",
"votesData": {
"votes": {
"in":[
{
"firstName" : "Raj",
"lastName" : "Taj"
},
{
"firstName" : "Badger",
"lastName" : "Tagger"
},
{
"firstName" : "Candle",
"lastName" : "Bangle"
}
] ,
"out" : [
{
"firstName" : "Bonnie",
"lastName" : "Clooney"
},
{
"firstName" : "Clyde",
"lastName" : "Hyde"
}
]
}
}
}
}
The Interface:
public interface APIInterface {
@GET("/")
Call<List<In>> getInUsers();
@GET("/")
Call<List<Out>> getOutUsers();
}
I got the models from http://www.jsonschema2pojo.org/
in example class there was only message and planId. I was calling the example class in interface initially. but thought the error might be because of that so changed it to List but nothing.
POJO code from the site:
>
> -----------------------------------com.example.Example.java-----------------------------------
>
> package com.example;
>
> import com.google.gson.annotations.Expose; import
> com.google.gson.annotations.SerializedName;
>
> public class Example {
>
> @SerializedName("message") @Expose private String message;
> @SerializedName("planData") @Expose private PlanData planData;
>
> public String getMessage() { return message; }
>
> public void setMessage(String message) { this.message = message; }
>
> public PlanData getPlanData() { return planData; }
>
> public void setPlanData(PlanData planData) { this.planData = planData;
> }
>
> }
> -----------------------------------com.example.In.java-----------------------------------
>
> package com.example;
>
> import com.google.gson.annotations.Expose; import
> com.google.gson.annotations.SerializedName;
>
> public class In {
>
> @SerializedName("firstName") @Expose private String firstName;
> @SerializedName("lastName") @Expose private String lastName;
>
> public String getFirstName() { return firstName; }
>
> public void setFirstName(String firstName) { this.firstName =
> firstName; }
>
> public String getLastName() { return lastName; }
>
> public void setLastName(String lastName) { this.lastName = lastName; }
>
> }
> -----------------------------------com.example.Out.java-----------------------------------
>
> package com.example;
>
> import com.google.gson.annotations.Expose; import
> com.google.gson.annotations.SerializedName;
>
> public class Out {
>
> @SerializedName("firstName") @Expose private String firstName;
> @SerializedName("lastName") @Expose private String lastName;
>
> public String getFirstName() { return firstName; }
>
> public void setFirstName(String firstName) { this.firstName =
> firstName; }
>
> public String getLastName() { return lastName; }
>
> public void setLastName(String lastName) { this.lastName = lastName; }
>
> }
> -----------------------------------com.example.PlanData.java-----------------------------------
>
> package com.example;
>
> import com.google.gson.annotations.Expose; import
> com.google.gson.annotations.SerializedName;
>
> public class PlanData {
>
> @SerializedName("planId") @Expose private String planId;
> @SerializedName("votesData") @Expose private VotesData votesData;
>
> public String getPlanId() { return planId; }
>
> public void setPlanId(String planId) { this.planId = planId; }
>
> public VotesData getVotesData() { return votesData; }
>
> public void setVotesData(VotesData votesData) { this.votesData =
> votesData; }
>
> }
> -----------------------------------com.example.Votes.java-----------------------------------
>
> package com.example;
>
> import java.util.List; import com.google.gson.annotations.Expose;
> import com.google.gson.annotations.SerializedName;
>
> public class Votes {
>
> @SerializedName("in") @Expose private List<In> in = null;
> @SerializedName("out") @Expose private List<Out> out = null;
>
> public List<In> getIn() { return in; }
>
> public void setIn(List<In> in) { this.in = in; }
>
> public List<Out> getOut() { return out; }
>
> public void setOut(List<Out> out) { this.out = out; }
>
> }
> -----------------------------------com.example.VotesData.java-----------------------------------
>
> package com.example;
>
> import com.google.gson.annotations.Expose; import
> com.google.gson.annotations.SerializedName;
>
> public class VotesData {
>
> @SerializedName("votes") @Expose private Votes votes;
>
> public Votes getVotes() { return votes; }
>
> public void setVotes(Votes votes) { this.votes = votes; }
>
> }
回答1:
you have to do like below.
public interface APIInterface {
@GET("/")
Call<Example> getInUsers();
@GET("/")
Call<List<Out>> getOutUsers();
}
Your activity like below.
Call<Example> call1 = api.getInUsers();
call1.enqueue(new Callback<Example>() {
@Override
public void onResponse(Call<Example> call1, Response<Example> response) {
List<In> inUsers = response. getPlanData(). getVotesData().getVotes().getIn();
Log.v("InUsers",String.valueOf(inUsers));
data.add(new Vote(Vote.HEADER_TYPE,"IN"));
mAdapter.notifyDataSetChanged();
for(In vote : inUsers) {
data.add(new Vote(Vote.ITEM_TYPE,String.valueOf(vote)));
}
}
@Override
public void onFailure(Call<Example> call1, Throwable t) {
Toast.makeText(getActivity().getApplicationContext(), t.getMessage() + "IN LIST", Toast.LENGTH_LONG).show();
}
});
回答2:
Right way to parse your server response
Change your interface
@GET("/")
Call<Example> getInUsers();
Change call
Call<Example> call1 = api.getInUsers();
call1.enqueue(new Callback<Example>() {
@Override
public void onResponse(Call<Example> call1, Response<Example> response) {
List<In> inUsers = response.body().getPlanData().getVotesData().getVotes().getIn();
...your other code here...
回答3:
You are trying to get Json Array from response but the rsponse contains JsonObject
回答4:
The API doesn't return a List<In> or List<Out>. Instead, it returns an Example object. So instead of
public interface APIInterface {
@GET("/")
Call<List<In>> getInUsers();
@GET("/")
Call<List<Out>> getOutUsers();
}
you should use
public interface APIInterface {
@GET("/")
Call<Example> getUsers();
}
So your call should look like this:
Call<Example> call = api.getInUsers();
call.enqueue(new Callback<Example>() {
@Override
public void onResponse(Call<Example> call1, Response<Example> response) {
// ... whatever you want to do with that data.
// E.g. you can access inUsers via response.body().getPlanData().getVotesData().getVotes().getIn();
}
// ...
});
来源：https://stackoverflow.com/questions/46581681/retrofit-java-lang-illegalstateexception-expected-begin-array-but-was-begin