POST Multipart Form Data using Retrofit 2.0 including image

There is a correct way of uploading a file with its name with Retrofit 2, without any hack:

Define API interface:

@Multipart@POST("uploadAttachment")Call<MyResponse> uploadAttachment(@Part MultipartBody.Part filePart);                                    // You can add other parameters too

Upload file like this:

File file = // initialize file hereMultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), RequestBody.create(MediaType.parse("image/*"), file));Call<MyResponse> call = api.uploadAttachment(filePart);

This demonstrates only file uploading, you can also add other parameters in the same method with @Part annotation.

I am highlighting the solution in both 1.9 and 2.0 since it is useful for some

In 1.9, I think the better solution is to save the file to disk and use it as Typed file like:

RetroFit 1.9

(I don't know about your server-side implementation) have an API interface method similar to this

@POST("/en/Api/Results/UploadFile")void UploadFile(@Part("file") TypedFile file,                @Part("folder") String folder,                Callback<Response> callback);

And use it like

TypedFile file = new TypedFile("multipart/form-data",                                       new File(path));

For RetroFit 2 Use the following method

RetroFit 2.0 ( This was a workaround for an issue in RetroFit 2 which is fixed now, for the correct method refer jimmy0251's answer)

API Interface:

public interface ApiInterface {    @Multipart    @POST("/api/Accounts/editaccount")    Call<User> editUser(@Header("Authorization") String authorization,                        @Part("file\"; filename=\"pp.png\" ") RequestBody file,                        @Part("FirstName") RequestBody fname,                        @Part("Id") RequestBody id);}

Use it like:

File file = new File(imageUri.getPath());RequestBody fbody = RequestBody.create(MediaType.parse("image/*"),                                       file);RequestBody name = RequestBody.create(MediaType.parse("text/plain"),                                      firstNameField.getText()                                                    .toString());RequestBody id = RequestBody.create(MediaType.parse("text/plain"),                                    AZUtils.getUserId(this));Call<User> call = client.editUser(AZUtils.getToken(this),                                  fbody,                                  name,                                  id);call.enqueue(new Callback<User>() {    @Override    public void onResponse(retrofit.Response<User> response,                           Retrofit retrofit) {        AZUtils.printObject(response.body());    }    @Override    public void onFailure(Throwable t) {        t.printStackTrace();    }});

I used Retrofit 2.0 for my register users, send multipart/form File image and text from register account

In my RegisterActivity, use an AsyncTask

//AsyncTaskprivate class Register extends AsyncTask<String, Void, String> {    @Override    protected void onPreExecute() {..}    @Override    protected String doInBackground(String... params) {        new com.tequilasoft.mesasderegalos.dbo.Register().register(txtNombres, selectedImagePath, txtEmail, txtPassword);        responseMensaje = StaticValues.mensaje ;        mensajeCodigo = StaticValues.mensajeCodigo;        return String.valueOf(StaticValues.code);    }    @Override    protected void onPostExecute(String codeResult) {..}

And in my Register.java class is where use Retrofit with synchronous call

import android.util.Log;import com.tequilasoft.mesasderegalos.interfaces.RegisterService;import com.tequilasoft.mesasderegalos.utils.StaticValues;import com.tequilasoft.mesasderegalos.utils.Utilities;import java.io.File;import okhttp3.MediaType;import okhttp3.MultipartBody;import okhttp3.RequestBody;import okhttp3.ResponseBody;import retrofit2.Call; import retrofit2.Response;/**Created by sam on 2/09/16.*/public class Register {public void register(String nombres, String selectedImagePath, String email, String password){    try {        // create upload service client        RegisterService service = ServiceGenerator.createUser(RegisterService.class);        // add another part within the multipart request        RequestBody requestEmail =                RequestBody.create(                        MediaType.parse("multipart/form-data"), email);        // add another part within the multipart request        RequestBody requestPassword =                RequestBody.create(                        MediaType.parse("multipart/form-data"), password);        // add another part within the multipart request        RequestBody requestNombres =                RequestBody.create(                        MediaType.parse("multipart/form-data"), nombres);        MultipartBody.Part imagenPerfil = null;        if(selectedImagePath!=null){            File file = new File(selectedImagePath);            Log.i("Register","Nombre del archivo "+file.getName());            // create RequestBody instance from file            RequestBody requestFile =                    RequestBody.create(MediaType.parse("multipart/form-data"), file);            // MultipartBody.Part is used to send also the actual file name            imagenPerfil = MultipartBody.Part.createFormData("imagenPerfil", file.getName(), requestFile);        }        // finally, execute the request        Call<ResponseBody> call = service.registerUser(imagenPerfil, requestEmail,requestPassword,requestNombres);        Response<ResponseBody> bodyResponse = call.execute();        StaticValues.code  = bodyResponse.code();        StaticValues.mensaje  = bodyResponse.message();        ResponseBody errorBody = bodyResponse.errorBody();        StaticValues.mensajeCodigo  = errorBody==null                ?null                :Utilities.mensajeCodigoDeLaRespuestaJSON(bodyResponse.errorBody().byteStream());        Log.i("Register","Code "+StaticValues.code);        Log.i("Register","mensaje "+StaticValues.mensaje);        Log.i("Register","mensajeCodigo "+StaticValues.mensaje);    }    catch (Exception e){        e.printStackTrace();    }}}

In the interface of RegisterService

public interface RegisterService {@Multipart@POST(StaticValues.REGISTER)Call<ResponseBody> registerUser(@Part MultipartBody.Part image,                                @Part("email") RequestBody email,                                @Part("password") RequestBody password,                                @Part("nombre") RequestBody nombre);}

For the Utilities parse ofr InputStream response

public class Utilities {public static String mensajeCodigoDeLaRespuestaJSON(InputStream inputStream){    String mensajeCodigo = null;    try {        BufferedReader reader = new BufferedReader(                new InputStreamReader(                    inputStream, "iso-8859-1"), 8);        StringBuilder sb = new StringBuilder();        String line;        while ((line = reader.readLine()) != null) {            sb.append(line).append("\n");        }        inputStream.close();        mensajeCodigo = sb.toString();    } catch (Exception e) {        Log.e("Buffer Error", "Error converting result " + e.toString());    }    return mensajeCodigo;}}