How to upload multipart form data and image to server in android?

Question

Status code 500 during upload multipart entity image to server in android code

Html form: (can add successfully image to server)

Answer 1

I know I am late for posting this answer but still if someone wants to upload multiple images to the server in android

String uploadMultipleFiles(Api api, HashMap> fileListMap)
            throws IOException {

        String responseS;
        OkHttpClient timeOut = getOkHttpClient(api.getTimeOut());

        MultipartBody.Builder multipartBuilder = new MultipartBody.Builder()
                .setType(MultipartBody.FORM);
        int j = 0;
        ArrayList fileList;
        for (Map.Entry> entry : fileListMap.entrySet()) {
            String key = entry.getKey();
            fileList = entry.getValue();

            multipartBuilder.addFormDataPart("data[" + j + "].name", key);

            if (fileList != null) {
                for (int i = 0; i < fileList.size(); i++) {

                    File fileListRequest = fileList.get(i);

                    if (fileListRequest.exists()) {
                        String ext = CommonUtils.getExtension(fileListRequest.getName());
                        /* Changing Media Type whether JPEG or PNG **/
                        final MediaType MEDIA_TYPE = ext.endsWith("png") ? MEDIA_TYPE_PNG :
                                ext.endsWith("jpg") ? MEDIA_TYPE_JPG : MEDIA_TYPE_JPEG;

                        multipartBuilder.addFormDataPart("data[" + j + "].files[" + i + "]",
                                fileListRequest.getName(),
                                RequestBody.create(MEDIA_TYPE, fileListRequest));

                    }
                }
            }
            j++;
        }
        RequestBody requestBody = multipartBuilder.build();
        Request.Builder requestBuilder = new Request.Builder()
                .url(Objects.requireNonNull(api.getUrl()))
                .post(requestBody);
        buildHeaders(requestBuilder);
        Response response = timeOut.newCall(requestBuilder.build()).execute();
        responseS = response.body().string();
        Log.i(api.getName().name(), responseS);
        return responseS;
    } 

Above code is for uploading multiple images to the server and for a single image you need to add only a single line below

multipartBuilder.addFormDataPart("fileName",fileListRequest.getName(),RequestBody create(MEDIA_TYPE,fileListRequest));