Develop Reference

Why response.body() its null?

Im using retrofit to send a a json object to the server, im trying to create a user, im sending this json object
{"apellido":"prueba","email":"prueba#hotmail.com","fechaDeNacimiento":"11/29/1998","formaDeRegistro":"Android","nombre":"prueba","password":"12345678","username":"prueba"}
In this example i create a invalid user , so the server response with a json object where code its the code error and message its the explication of the error
[{"code":"5","message":"The email is in use"}]
Interface
public interface UserClient {
#POST("usuarios")
Call<Usuarios> create(#Body Usuarios usuario);
}
Data model
import com.google.gson.annotations.SerializedName;
public class Usuarios {
#SerializedName("username")
String username;
#SerializedName("email")
String email;
#SerializedName("password")
String password;
#SerializedName("nombre")
String nombre;
#SerializedName("apellido")
String apellido;
#SerializedName("fechaDeNacimiento")
String fechaDeNacimiento;
#SerializedName("formaDeRegistro")
String formaDeRegistro;
String message;
public Usuarios(String email, String username, String password, String nombre, String apellido, String fechaDeNacimiento, String formaDeRegistro){
this.username=username;
this.email=email;
this.password=password;
this.nombre = nombre;
this.apellido= apellido;
this.fechaDeNacimiento = fechaDeNacimiento;
this.formaDeRegistro = formaDeRegistro;
}
public String getMessage(){
return message;
}
}
and Retrofit implement
OkHttpClient.Builder okhttpClientBuilder=new OkHttpClient.Builder();
HttpLoggingInterceptor loggin=new HttpLoggingInterceptor();
loggin.setLevel(HttpLoggingInterceptor.Level.BODY);
okhttpClientBuilder.addInterceptor(loggin);
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl("https://intense-lake-39874.herokuapp.com")
.addConverterFactory(GsonConverterFactory.create())
.client(okhttpClientBuilder.build());
Retrofit retrofit = builder.build();
UserClient service = retrofit.create(UserClient.class);
Call<Usuarios> call = service.create(usuario);
call.enqueue(new Callback<Usuarios>() {
#Override
public void onResponse(Call<Usuarios> call, Response<Usuarios> response) {
Toast.makeText(Main2Activity.this,"Usuario Registrado! "+response.body().getMessage,Toast.LENGTH_SHORT).show();
}
#Override
public void onFailure(Call<Usuarios> call, Throwable t) {
Toast.makeText(Main2Activity.this,"Algo fallo..",Toast.LENGTH_SHORT).show();
}
});
}
So i can see the logcat response but in the body its appoint to null, how i can acces to the "message"?
This is the logcat

That error is because your response is not successful therefore you need to parse the error body, try with this code:
if (response.isSuccessful()) {
// Do your success stuff...
} else
{
try
{
JSONObject jObjError = new JSONObject(response.errorBody().string());
Toast.makeText(getContext(), jObjError.getString("message"), Toast.LENGTH_LONG).show();
} catch (Exception e) {
Toast.makeText(getContext(), e.getMessage(), Toast.LENGTH_LONG).show();
}
}
Of course that you can use another parser like Gson .

Get OAuth Token from Web API to android

I'm trying to get ِِOAuth token in android from my web api. I have tested the api in Postman and it's working perfect.
Screenshot for the successful call from Postman
now I need to call this Api from my android app using retrofit 2 to get the token, for that I tried to use the following interface but it's not working.
#FormUrlEncoded
#POST("/Token")
public Call<String> Token(#Field("grant_type") String grant_type, #Field("username") String username, #Field("password") String password);
How can I get this done?

In my case I using this below way to call Web Api in Android Application.
Note : I am using OkHttp library.
Create Token class
public class Token {
public String access_token;
public String token_type;
public int expires_in;
public Token(){
}
}
Now add OkHttp library jar to your Project.
for more detail visit this :
http://square.github.io/okhttp/
Now to get OAuth Token call this way
OkHttpClient client = new OkHttpClient();
Request.Builder builder = new Request.Builder();
builder.url(write your url here);
builder.addHeader("Content-Type", "application/x-www-form-urlencoded");
builder.addHeader("Accept", "application/json");
FormEncodingBuilder parameters = new FormEncodingBuilder();
parameters.add("grant_type", "password");
parameters.add("username", edituser);
parameters.add("password", editpassword);
builder.post(parameters.build());
try {
Response response = client.newCall(builder.build()).execute();
if (response.isSuccessful()) {
String json = response.body().string();
}
catch(Exception e){
// catch Exception here
}
finally in response you will get your Token.

Late but it might help someone
Interface class
#FormUrlEncoded
#POST("/Token")
void getTokenAccess(#Field("grant_type") String grantType, #Field("username") String username, #Field("password") String password, Callback<TokenResponse> callback);
TokenResponse class
public class TokenResponse {
private String access_token,token_type,expires_in,userName;
public String getAccess_token() {
return access_token;
}
public String getToken_type() {
return token_type;
}
public String getExpires_in() {
return expires_in;
}
public String getUserName() {
return userName;
}
}
I am using retrofit 1.9.0
RestAdapter adapter = new RestAdapter.Builder()
.setEndpoint(ENDPOINT_URL).setLogLevel(RestAdapter.LogLevel.FULL)
.build();
NetApi api = adapter.create(NetApi.class);
api.getTokenAccess("password", email, password, new Callback<TokenResponse>() {
#Override
public void success(TokenResponse tokenResponse, Response response) {
showProgress(false);
try{
MainActivity.tokenResponse = tokenResponse;
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}catch (Exception e){
Toast.makeText(LoginActivity.this,"Unknown Error",Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}
#Override
public void failure(RetrofitError error) {
Toast.makeText(LoginActivity.this,""+error.getMessage(),Toast.LENGTH_LONG).show();
showProgress(false);
}
});

Simple login form with Retrofit

I'm starting to work with Retrofit but I'm stuck on this simple step. I have a login form and I'm trying to authenticate with the server but I just can't send the request.
This is what I've tried:
My Retrofit client:
private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
private static Retrofit.Builder builder =
new Retrofit.Builder()
.baseUrl(API_BASE_URL)
.addConverterFactory(GsonConverterFactory.create());
public static <S> S createService(Class<S> serviceClass) {
Retrofit retrofit = builder.client(httpClient.build()).build();
return retrofit.create(serviceClass);
}
My login interface:
public interface Login {
#POST(LOGIN)
Call<String> loginWithCredentials(#Body LoginCredentials data);
}
The LoginCredentials class:
public class LoginCredentials {
private String name;
private String pass;
public LoginCredentials(String name, String pass) {
this.name = name;
this.pass = pass;
}
}
And the part where I call it:
#Override
public void onClick(View v) {
showProgress(true);
String username = userField.getText().toString();
String password = passField.getText().toString();
ApiController.Login loginClient = ApiController.createService(ApiController.Login.class);
Call<String> call =loginClient.loginWithCredentials(new LoginCredentials(username, password));
call.enqueue(new Callback<String>() {
#Override
public void onResponse(Call<String> call, Response<String> response) {
handleResponse(response.body());
}
#Override
public void onFailure(Call<String> call, Throwable t) {
showProgress(false);
Log.e(TAG, t.getLocalizedMessage());
}
});
}
And I keep getting the error Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $but I have no idea what it means.

I figured it out. It was easier than I thought. You can skip the parsing that Retrofit does by setting the response type of the method as ResponseBody. Them you just need to read the response and use the string() method that provides. That's it!
Example:
public interface Login {
#POST(LOGIN)
Call<ResponseBody> loginWithCredentials(#Body LoginCredentials data);
}
Then use like this:
String username = userField.getText().toString();
String password = passField.getText().toString();
ApiController.Login loginClient = ApiController.createService(ApiController.Login.class);
Call<ResponseBody> call = loginClient.loginWithCredentials(new LoginCredentials(username, password));
call.enqueue(new Callback<ResponseBody>() {
#Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
if (response.isSuccessful()) {
try {
// get String from response
String stringResponse = response.body().string();
// Do whatever you want with the String
} catch (IOException e) {
e.printStackTrace();
}
}
}
#Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
// handle error
}
});

This error means that gson trying to parse string from server as JSON object and can't find the opening bracket.
I think you could return actual JSON from server like
{"api_token": "token"}
Also this bug could possibly be solved by importing latest GSON version mentioned here

Extracting JSON data with Retrofit and Gson

I'm trying to figure out how to extract data from my JSON response and loop through the data. I have the following Retrofit code to request the JSON data from my REST API:
final RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(URL)
.build();
final ApiEndpointInterface apiService = restAdapter.create(ApiEndpointInterface.class);
apiService.getJsonData(1, new Callback<User>() {
#Override
public void success(User user, Response response) {
Gson gson = new GsonBuilder().registerTypeAdapter(User.class, new Deserializer()).create();
User c = gson.fromJson(response.getBody().toString(), User.class);
}
#Override
public void failure(RetrofitError retrofitError) {
retrofitError.printStackTrace();
}
});
And my deserializer:
class Deserializer implements JsonDeserializer<User> {
#Override
public User deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
throws JsonParseException {
// Get the "content" element from the parsed JSON
JsonElement content = je.getAsJsonObject().get("data");
// Deserialize it. You use a new instance of Gson to avoid infinite recursion
// to this deserializer
return new Gson().fromJson(content, User.class);
}
}
The JSON response:
{
"success":true,
"data":[
{
"id":"1",
"username":"User1"
},
{
"id":"2",
"username":"User2"
}
]
}
Within Retrofit's success callback, I'm not sure how to actually loop through the data's items and extract the data from it (like the person's username).

Create this model classes:
private class ResponseData {
public boolean success;
public List<User> data;
}
private class User {
public String id;
public String username;
}
Now you can do this:
final RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(URL)
.build();
final ApiEndpointInterface apiService = restAdapter.create(ApiEndpointInterface.class);
apiService.getJsonData(1, new Callback<ResponseData>() {
#Override
public void success(ResponseData responseData, Response response) {
for (User u : responseData.data) {
String name = u.username;
// etc
}
}
#Override
public void failure(RetrofitError retrofitError) {
retrofitError.printStackTrace();
}
});

Getting simple JSON object response using Retrofit library

I have a web query with JSON response as:
{
"status":true,
"result":
{
"id":"1",
"name":"ABC 1",
"email":"info#ABc.dcom",
"password":"123456",
"status":false,
"created":"0000-00-00 00:00:00"
},
"message":"Login successfully"
}
I am using the following code for:
#GET("/stockers/login")
public void login(
#Query("email") String email,
#Query("password") String password,
Callback<JSONObject> callback);
In Debugger the query made by the Retrofit library is correct, however I get an empty JSON in response.
ApiManager.getInstance().mUrlManager.login(
email.getText().toString().trim(),
password.getText().toString().trim(),
new Callback<JSONObject>()
{
#Override
public void success(JSONObject jsonObj, Response response)
{
mDialog.dismiss();

Simply use JsonElement insted of JSONobject. Like:
#GET("/stockers/login")
Call<JsonElement> getLogin(
#Query("email") String email,
#Query("password") String password
);

The answers seam kinda old and for Retrofit 1, if you are using Retrofit 2 and don't want to use a converter you have to use ResponseBody.
#GET("/stockers/login")
public void login(
#Query("email") String email,
#Query("password") String password,
Callback<ResponseBody> callback);
And then in your callback in the onResponse method call string on the body and create a JSONObject from it.
if(response.isSuccessful())
JSONObject json = new JSONObject(response.body().string());

Instead of Callback with JSONObject class, you could use the Retrofit basic callback which use the Response class and then, once you get the response, you had to create the JSONObject from it.
See this:
https://stackoverflow.com/a/30870326/2037304
Otherwise you can create your own model class to handle the response.
First the Result class:
public class Result {
public int id;
public String name;
public String email;
public String password;
public boolean status;
public Date created;
}
And then your response class to use with Retrofit
public class MyResponse {
public boolean status;
public Result result;
public String message;
}
Now you can call:
#GET("/stockers/login")
public void login(
#Query("email") String email,
#Query("password") String password,
Callback<MyResponse> callback);

You can create custom factory like belowe or copy it from here :
https://github.com/marcinOz/Retrofit2JSONConverterFactory
public class JSONConverterFactory extends Converter.Factory {
public static JSONConverterFactory create() {
return new JSONConverterFactory();
}
private JSONConverterFactory() {
}
#Override public Converter<?, RequestBody> requestBodyConverter(Type type,
Annotation[] parameterAnnotations, Annotation[] methodAnnotations, Retrofit retrofit) {
if (type == JSONObject.class
|| type == JSONArray.class) {
return JSONRequestBodyConverter.INSTANCE;
}
return null;
}
#Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
Retrofit retrofit) {
if (type == JSONObject.class) {
return JSONResponseBodyConverters.JSONObjectResponseBodyConverter.INSTANCE;
}
if (type == JSONArray.class) {
return JSONResponseBodyConverters.JSONArrayResponseBodyConverter.INSTANCE;
}
return null;
}
}
public class JSONRequestBodyConverter<T> implements Converter<T, RequestBody> {
static final JSONRequestBodyConverter<Object> INSTANCE = new JSONRequestBodyConverter<>();
private static final MediaType MEDIA_TYPE = MediaType.parse("text/plain; charset=UTF-8");
private JSONRequestBodyConverter() {
}
#Override public RequestBody convert(T value) throws IOException {
return RequestBody.create(MEDIA_TYPE, String.valueOf(value));
}
}
public class JSONResponseBodyConverters {
private JSONResponseBodyConverters() {}
static final class JSONObjectResponseBodyConverter implements Converter<ResponseBody, JSONObject> {
static final JSONObjectResponseBodyConverter INSTANCE = new JSONObjectResponseBodyConverter();
#Override public JSONObject convert(ResponseBody value) throws IOException {
try {
return new JSONObject(value.string());
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
static final class JSONArrayResponseBodyConverter implements Converter<ResponseBody, JSONArray> {
static final JSONArrayResponseBodyConverter INSTANCE = new JSONArrayResponseBodyConverter();
#Override public JSONArray convert(ResponseBody value) throws IOException {
try {
return new JSONArray(value.string());
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
}
}

try this instead :
#GET("/stockers/login")
public void login(
#Query("email") String email,
#Query("password") String password,
Callback<Response> callback); // set the callback generic parameter to Response
ApiManager.getInstance().mUrlManager.login(
email.getText().toString().trim(),
password.getText().toString().trim(),
new Callback<Response>()
{
#Override
public void success(Response response, Response response1)
{
String json = response.getBody();
try {
JSONObject jsonObj = new JSONObject(json);
} catch(JSONException e) {
}
alog.dismiss();

Just define the type of the object you want to get as a String as com.google.gson.JsonObject instead of String and call .toString() on that object to get the JSON string itself.

I`m using this site to create my classes (POJO) from JSON.
http://www.jsonschema2pojo.org/
just be sure to set to JSON insted of JSON Schema and check GSON, because retrofit is using GSON as well for parsing.
your retrofit code looks fine.

Use JacksonConverterFactory instead of GsonConverterFactory while setting up Retrofit. Now you can directly work with JsonObject responses.
compile 'com.squareup.retrofit2:converter-jackson:2.1.0'