如何使用retrofit2接收Json数组（“结果”）

Question

我知道如何接收这种类型的数组：

[
{
    "username": "luis",
    "job": "developer",
    "age": 23
}
]

我的问题是当我必须接收具有特定名称的数组时：

{"result":[{"userid":"1","username":"Luis","job":"developer","age":"23"}]}

在这种情况下，我必须使用retrofit2 接收上面名称为“result”的数组。谁能帮助我，我是 Retrofit 的新手。

这是我尝试过的：

主活动

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;
    }

}

API接口：

public interface ApiInterface {

    @GET("getAllUser.php")
    Call<List<Workers>> getWorkers();


}

我的 POJO 或工人类：

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;
    }
} 

最后是我的 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);
        }
    }
}

我已经卡了两天了，我仍然无法解决它。请帮忙！

Answer 1

创建一个名为 Result 的类模型，并在 Interface 类中编写以下代码：

 @GET("your endpoint")
 Call<Result>getResult();

并在 Result 类中编写以下代码：

 @SerializedName("result") 
 private List<UserInfo> userInfo;

祝你好运。

Answer 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;
}}

使用this 网站制作一些模型。我已经使用这个网站完成了上述代码。

现在，这样做

@Get<"url">
call<Example> get()

Answer 3

如果一定要使用这个json格式

{"result":[{"userid":"1","username":"Luis","job":"developer","age":"23"}]}

你必须像这样创建两个模型：

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
}

将 GsonConverterFactory 添加到您的应用 build.gradle

com.squareup.retrofit2:converter-gson:2.14

现在构建改造实例：

 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();
 }

最后得到这样的结果：

retrofit.getResult().enqueue(.....)

Answer 4

在给出的 3 个答案和一些视频教程的指导下进行了大量测试后，我终于弄明白了。

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;
    }

}

API接口：

public interface ApiInterface {

    //this could be test1_database/getAllUser.json
    @GET("test1_database/getAllUser.php")
    Call<Result> getWorkers();


}

工人（POJO）类：

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;
    }

}

结果（POJO）类：

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 类：

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) {

           }
       });

    }}

我正在使用此适配器在 recyclerview 中显示结果：

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);
        }
    }
}

感谢大家的帮助！