Retrofit Uploading multiple images to a single key

We can use MultipartBody.Part array to upload an array of images to a single key. Here is the solution
WebServicesAPI

@Multipart
@POST(WebServices.UPLOAD_SURVEY)
Call<UploadSurveyResponseModel> uploadSurvey(@Part MultipartBody.Part[] surveyImage,
                                             @Part MultipartBody.Part propertyImage,
                                             @Part("DRA") RequestBody dra);

Here is the method for uploading the files.

private void requestUploadSurvey () {
    File propertyImageFile = new File(surveyModel.getPropertyImagePath());
    RequestBody propertyImage = RequestBody.create(MediaType.parse("image/*"),
                                                   propertyImageFile);
    MultipartBody.Part propertyImagePart = MultipartBody.Part.createFormData("PropertyImage",
                                                                             propertyImageFile.getName(),
                                                                             propertyImage);

    MultipartBody.Part[] surveyImagesParts = new MultipartBody.Part[surveyModel.getPicturesList()
                                                                               .size()];

    for (int index = 0; index <
                        surveyModel.getPicturesList()
                                   .size(); index++) {
        Log.d(TAG,
              "requestUploadSurvey: survey image " +
              index +
              "  " +
              surveyModel.getPicturesList()
                         .get(index)
                         .getImagePath());
        File file = new File(surveyModel.getPicturesList()
                                        .get(index)
                                        .getImagePath());
        RequestBody surveyBody = RequestBody.create(MediaType.parse("image/*"),
                                                    file);
        surveyImagesParts[index] = MultipartBody.Part.createFormData("SurveyImage",
                                                                     file.getName(),
                                                                     surveyBody);
    }

    final WebServicesAPI webServicesAPI = RetrofitManager.getInstance()
                                                         .getRetrofit()
                                                         .create(WebServicesAPI.class);
    Call<UploadSurveyResponseModel> surveyResponse = null;
    if (surveyImagesParts != null) {
        surveyResponse = webServicesAPI.uploadSurvey(surveyImagesParts,
                                                     propertyImagePart,
                                                     draBody);
    }
    surveyResponse.enqueue(this);
}

I wasted a lot timing on accepted ans. but that didn't work in my case. So after a lot of search i found this one. And its working 100% in my case.

private void uploadMultiFile() {


    ArrayList<String> filePaths = new ArrayList<>();
    filePaths.add("storage/emulated/0/DCIM/Camera/IMG_20170802_111432.jpg");
    filePaths.add("storage/emulated/0/Pictures/WeLoveChat/587c4178e4b0060e66732576_294204376.jpg");
    filePaths.add("storage/emulated/0/Pictures/WeLoveChat/594a2ea4e4b0d6df9153028d_265511791.jpg");

    MultipartBody.Builder builder = new MultipartBody.Builder();
    builder.setType(MultipartBody.FORM);

    builder.addFormDataPart("user_name", "Robert");
    builder.addFormDataPart("email", "[email protected]");

    // Map is used to multipart the file using okhttp3.RequestBody
    // Multiple Images
    for (int i = 0; i < filePaths.size(); i++) {
        File file = new File(filePaths.get(i));
        builder.addFormDataPart("file[]", file.getName(), RequestBody.create(MediaType.parse("multipart/form-data"), file));
    }


    MultipartBody requestBody = builder.build();
    Call<ResponseBody> call = uploadService.uploadMultiFile(requestBody);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

            Toast.makeText(MainActivity.this, "Success " + response.message(), Toast.LENGTH_LONG).show();




        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {

            Log.d(TAG, "Error " + t.getMessage());
        }
    });


}

and this is interface

@POST("/upload_multi_files/MultiPartUpload.php")
Call<ResponseBody> uploadMultiFile(@Body RequestBody file);