Retrofit 2 Get JSON from Response body

Question

I want to get string json from my api using retrofit 2  I have no problem when using retrofit 1 to get this json but using retrofit 2 returns null for me   This is what my json looks like    id  1  Username   admin   Level   Administrator     This is my API   FormUrlEncoded  POST   api level   Call lt ResponseBody gt  checkLevel  Field  id   int id     This is how my code looks like  Retrofit retrofit   new Retrofit Builder                    baseUrl Config BASE URL                   addConverterFactory GsonConverterFactory create                     build            Api api   retrofit create Api class           Call lt ResponseBody gt  call   api checkLevel 1           call enqueue new Callback lt ResponseBody gt                   Override             public void onResponse Call lt ResponseBody gt  call  Response lt ResponseBody gt  response                    JsonObject post   new JsonObject   get response body   toString    getAsJsonObject                        if  post get  Level   getAsString   contains  Administrator                                                         Override             public void onFailure Call lt ResponseBody gt  call  Throwable t                                I m new to retrofit 2 and using above code  it always make my apps crash because response body   toString   returns null   Please guide me on how to get that json string so I can convert it into JsonObject

User · Answer

If you want to get whole response in JSON format  try this   I have tried a new way to get whole response from server in JSON format without creating any model class  I am not using any model class to get data from server because I don t know what response I will get or it may change according to requirements   this is JSON response     contacts                    id    c200            name    sunil            email    email gmail com            address    xx-xx-xxxx x - street  x - country            gender     male            phone                  mobile     91 0000000000                home    00 000000                office    00 000000                                  id    c201            name    Johnny Depp            email    johnny depp gmail com            address    xx-xx-xxxx x - street  x - country            gender     male            phone                  mobile     91 0000000000                home    00 000000                office    00 000000                                           In your API interface change the parameter  public interface ApiInterface    POST   index php User login    your api link   FormUrlEncoded Call lt Object gt  getmovies  Field  user email address   String title                   Field  user password   String body      in your main activity where you are calling this  ApiInterface apiService           ApiClient getClient   create ApiInterface class    Call call   apiService getmovies  a gmail com   123456    call enqueue new Callback          Override     public void onResponse Call call  Response response            Log e  TAG    response 33    new Gson   toJson response body                   Override     public void onFailure Call call  Throwable t            Log e  TAG    onFailure    t toString                 Log error here since request failed            after that you can normally get parameter using JSON object and JSON array   Output

User · Answer

If you don t have idea about What could be the response from the API  Follow the steps to convert the responsebody response value into bytes and print in the String format You can get the entire response printed in the console    Then you can convert string to JSONObject easily         apiService getFeeds headerMap  map  enqueue object   Callback  retrofit2 Callback lt ResponseBody gt                override fun onFailure call  Call lt ResponseBody gt    t  Throwable                                override fun onResponse call  Call lt ResponseBody gt    response  Response lt ResponseBody gt                      val bytes    response   body     bytes                    Log d  Retrofit Success          String bytes

User · Answer

add dependency for retrofit2   compile  com google code gson gson 2 6 2  compile  com squareup retrofit2 retrofit 2 0 2  compile  com squareup retrofit2 converter-gson 2 0 2    create class for base url  public class ApiClient        public static final String BASE URL    base url    private static Retrofit retrofit   null   public static Retrofit getClient         if  retrofit  null            retrofit   new Retrofit Builder                    baseUrl BASE URL                   addConverterFactory GsonConverterFactory create                     build              return retrofit         after that create class model to get value  public class ApprovalModel     SerializedName  key parameter   private String approvalName  public String getApprovalName         return approvalName        create interface class  public interface ApiInterface     GET  append url   Call lt CompanyDetailsResponse gt  getCompanyDetails        after that in main class   if Connectivity isConnected mContext                final ProgressDialog mProgressDialog   new ProgressDialog mContext               mProgressDialog setIndeterminate true               mProgressDialog setMessage  Loading                   mProgressDialog show                 ApiInterface apiService                       ApiClient getClient   create ApiInterface class                Call lt CompanyDetailsResponse gt  call   apiService getCompanyDetails                call enqueue new Callback lt CompanyDetailsResponse gt                       Override                 public void onResponse Call lt CompanyDetailsResponse gt call  Response lt CompanyDetailsResponse gt  response                        mProgressDialog dismiss                        if response  null  amp  amp  response isSuccessful                              List lt CompanyDetails gt  companyList   response body   getCompanyDetailsList                             if  companyList    null amp  amp companyList size   gt 0                                for  int i   0  i  lt  companyList size    i                                      Log d TAG       companyList get i                                                             get values                          else                                show alert not get value                                                else                            show error message                                                            Override                 public void onFailure Call lt CompanyDetailsResponse gt call  Throwable t                           Log error here since request failed                     Log e TAG  t toString                         mProgressDialog dismiss                                               else                network error alert box

User · Answer

use this to get String   String res   response body   string      instead of  String res   response body   toString      and always keep a check for null before converting responsebody to string  if response body      null          do your stuff

User · Answer

You can use it like this    public void onResponse Call lt JsonObject gt  call  Response lt JsonObject gt  response                if  response isSuccessful                      try                       JSONObject jsonObject   new JSONObject new Gson   toJson response body                          msg   jsonObject getString  msg                        status   jsonObject getBoolean  status                         msg   jsonObject getString  msg                        status   jsonObject getBoolean  status                      catch  JSONException e                        e printStackTrace                                       Toast makeText MainActivity this  msg  Toast LENGTH SHORT  show                    Log e  cvbnop  response body   toString                   else                   Toast makeText MainActivity this   Some error occurred      Toast LENGTH LONG  show

User · Answer

try                                                                                  JSONObject jsonObject   new JSONObject response body   string                    System out println jsonObject                                                  catch  JSONException   IOException e                                               e printStackTrace

User · Answer

A better approach is to let Retrofit generate POJO for you from the json  using gson    First thing is to add  addConverterFactory GsonConverterFactory create    when creating your Retrofit instance   For example  if you had a User java class  such as shown below  that corresponded to your json  then your retrofit api could return Call lt User gt   class User       private String id      private String Username      private String Level

User · Answer

So  here is the deal   When making   Retrofit retrofit   new Retrofit Builder                    baseUrl Config BASE URL                   addConverterFactory GsonConverterFactory create                     build      You are passing GsonConverterFactory create   here  If you do it like this  Gson will automatically convert the json object you get in response to your object  lt ResponseBody gt   Here you can pass all other converters such as Jackson  etc

User · Answer

I found that a combination of the other answers works   interface ApiInterface        GET   someurl       Call lt ResponseBody gt  getdata      apiService getdata   enqueue object   Callback       override fun onResponse call  Call  response  Response            val rawJsonString   response body    string              The important part are that the response type should be ResponseBody and use response body    string   to get the raw string   https   stackoverflow com a 33286112 860488

User · Answer

you can change your interface with code given below  if you need json String response     FormUrlEncoded  POST   api level   Call lt JsonObject gt  checkLevel  Field  id   int id       and retrofit function with this  Call lt JsonObject gt  call   api checkLevel 1       call enqueue new Callback lt JsonObject gt               Override         public void onResponse Call lt JsonObject gt  call  Response lt JsonObject gt  response                Log d  res   response body   toString                         Override         public void onFailure Call lt JsonObject gt  call  Throwable t                Log d  error  t getMessage

User · Answer

use this  response body   get 0  getUsername   toString

User · Answer

Use this link to convert your JSON into POJO with select options as selected in image below    You will get a POJO class for your response like this  public class Result         SerializedName  id        Expose     private Integer id       SerializedName  Username        Expose     private String username       SerializedName  Level        Expose     private String level                         return       The id            public Integer getId             return id                               param id       The id            public void setId Integer id            this id   id                               return       The username            public String getUsername             return username                               param username       The Username            public void setUsername String username            this username   username                               return       The level            public String getLevel             return level                               param level       The Level            public void setLevel String level            this level   level             and use interface like this    FormUrlEncoded  POST   api level   Call lt Result gt  checkLevel  Field  id   int id     and call like this   Call lt Result gt  call   api checkLevel 1   call enqueue new Callback lt Result gt           Override     public void onResponse Call lt Result gt  call  Response lt Result gt  response          if response isSuccessful             response body       have your all data         int id  response body   getId            String userName   response body   getUsername            String level   response body   getLevel             else   Toast makeText context response errorBody   string   Toast LENGTH SHORT  show       this will tell you why your api doesnt work most of time              Override     public void onFailure Call lt Result gt  call  Throwable t         Toast makeText context t toString   Toast LENGTH SHORT  show       ALL NETWORK ERROR HERE              and use dependencies in Gradle   compile  com squareup retrofit2 retrofit 2 3 0  compile  com squareup retrofit2 converter-gson 2      NOTE  The error occurs because you changed your JSON into POJO  by use of addConverterFactory GsonConverterFactory create    in retrofit   If you want response in JSON then remove the addConverterFactory GsonConverterFactory create    from Retrofit  If not then use the above solution

[android] Retrofit 2: Get JSON from Response body

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