How to parse a json using retrofit 2.0?

Question

Am having a doubt on parsing json objects using retrofit my json response will be like this:

{"loginResult":"{\"Result\":2,\"UserID\":0,\"ModuleID\":1,\"ModuleName\":\"CRM\"}"}

My doubt is if result from response is 2 it should redirect to next page . How to create pojo for this json response ?

penkzhou · Answer 1 · 2015-11-11T07:21:55.207

Simply,use GsonConverterFactory, before use that you need add this to your gradle file:

compile 'com.squareup.retrofit:converter-gson'

Let's say you have a Object called LoginResponse and it has a attribute called loginResult:

public class LoginResponse{
    LoginResult loginResult;
}

The LoginResult object define is like this:

public class LoginResult{
    int result;
    long userId;
    ...
}

Then use Retrofit to request:

    public interface APIService {
        @POST("SOMETHING/login")
        Call<LoginResponse> doLogin();

    }

    public void doSomething() {
        Retrofit retrofit = new Retrofit.Builder()
            .baseUrl("YOUR LOGIN BASE URL")
            .addConverterFactory(GsonConverterFactory.create())
            .build();

        APIService service = retrofit.create(APIService.class);
        Call<LoginResponse> loginCall = service.doLogin();
        //if you want to request synchronous:
        LoginResponse response = loginCall.execute();
        //if you want to request asynchronous:
        LoginResponse response = loginCall.enqueue(new Callback<LoginResponse>() {
          @Override void onResponse(/* ... */) {
               // ...
           }

          @Override void onFailure(Throwable t) {
             // ...
          }
        });
    }

When you get the LoginResponse, you can do you work:

if(response.loginResult.result == 2){
    //do work here.something like startActivity(...);
}

Reference:

how to call like if result is 2 it will redirect to next activity in the main asynchronous retrofit — M.Yogeshwaran, Nov 11 '15 at 07:10
If you don't want to create POJOs, you can set the response type to JSONObject, and process it. — Fustigador, Nov 11 '15 at 07:25
http://stackoverflow.com/questions/33579523/unable-to-resolve-static-method/33603183#33603183 this is my code — M.Yogeshwaran, Nov 11 '15 at 07:31

score 1 · Answer 2 · answered Nov 11 '15 at 06:01

1

Use http://www.jsonschema2pojo.org/ to create pojo class easily for your needs. In that set source type as json and Annotation style Gson. Adding yourjson as pojo created from there

     -----------------------------------com.example.Example.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("org.jsonschema2pojo")
public class Example {

@SerializedName("loginResult")
@Expose
private LoginResult loginResult;

/**
* 
* @return
* The loginResult
*/
public LoginResult getLoginResult() {
return loginResult;
}

/**
* 
* @param loginResult
* The loginResult
*/
public void setLoginResult(LoginResult loginResult) {
this.loginResult = loginResult;
}

}
-----------------------------------com.example.LoginResult.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("org.jsonschema2pojo")
public class LoginResult {

@SerializedName("Result")
@Expose
private Integer Result;
@SerializedName("UserID")
@Expose
private Integer UserID;
@SerializedName("ModuleID")
@Expose
private Integer ModuleID;
@SerializedName("ModuleName")
@Expose
private String ModuleName;

/**
* 
* @return
* The Result
*/
public Integer getResult() {
return Result;
}

/**
* 
* @param Result
* The Result
*/
public void setResult(Integer Result) {
this.Result = Result;
}

/**
* 
* @return
* The UserID
*/
public Integer getUserID() {
return UserID;
}

/**
* 
* @param UserID
* The UserID
*/
public void setUserID(Integer UserID) {
this.UserID = UserID;
}

/**
* 
* @return
* The ModuleID
*/
public Integer getModuleID() {
return ModuleID;
}

/**
* 
* @param ModuleID
* The ModuleID
*/
public void setModuleID(Integer ModuleID) {
this.ModuleID = ModuleID;
}

/**
* 
* @return
* The ModuleName
*/
public String getModuleName() {
return ModuleName;
}

/**
* 
* @param ModuleName
* The ModuleName
*/
public void setModuleName(String ModuleName) {
this.ModuleName = ModuleName;
}

}

answered Nov 11 '15 at 06:01

Jackson Chengalai

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do i need to create two pojo – M.Yogeshwaran Nov 11 '15 at 06:52
how to call like if result is 2 it will redirect to next activity in the main asynchronous retrofit – M.Yogeshwaran Nov 11 '15 at 07:05
You need to implement to callback for that.. after successful request the callback's success method will execute.. In that callback you can redirect in to new activity – Jackson Chengalai Nov 11 '15 at 07:09
check above code.. In that logincall.enque method will execute – Jackson Chengalai Nov 11 '15 at 07:13
do i need to create object for Login result then do i need call getresult method or is there any other procedure – M.Yogeshwaran Nov 11 '15 at 07:20
http://stackoverflow.com/questions/33579523/unable-to-resolve-static-method/33603183#33603183 this is my code – M.Yogeshwaran Nov 11 '15 at 07:33
are you getting any response from the server.. Please debug using studio ..then you can easily find out where is error happening..but in that question's log its not appearing to be a network related issue.. – Jackson Chengalai Nov 11 '15 at 07:42
i have resolved that issue now my prob is need to check with result which is coming as json response if it is 2 need to redirect to next activity need to post the user entered value from edittext – M.Yogeshwaran Nov 11 '15 at 08:20
Added the answer for that question check it – Jackson Chengalai Nov 11 '15 at 08:31
need to get and validate result alone – M.Yogeshwaran Nov 11 '15 at 08:50
if you use this pojo you can get the result by using loginresultobject.getLoginResult().getResult() – Jackson Chengalai Nov 11 '15 at 09:30

How to parse a json using retrofit 2.0?

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