Android okHttp addFormDataPart dynamically for Multiple Image

Hello AndroidUploaders,

I had given answer Uploading a large file in multipart using OkHttp but i am stuck with multiple image uploading.

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  • I want to upload dynamically 1 to 10 image at a time.

    RequestBody requestBody = new MultipartBuilder()
                        .addFormDataPart(KEY_PHOTO_CAPTION, photoCaption)
                        .addFormDataPart(KEY_FILE, "profile.png", RequestBody.create(MEDIA_TYPE_PNG, sourceFile))

    I have ArrayList of PhotoCaption class which has captionPhoto and urlPhoto so how can i addFormDataPart()

    I am thinking to make loop and call this function that many times of ArrayList size.

    Is there any solution to addFormDataPart() use dynamically?

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  • 2 Solutions collect form web for “Android okHttp addFormDataPart dynamically for Multiple Image”

    This answer is for OkHttp2

    For OkHttp3 You can see this post.

    For multiple image you just need to run the loop as per your requirement, remaining part related to request will be same as you do.

      //  final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png");
    final MediaType MEDIA_TYPE=MediaType.parse(AppConstant.arrImages.get(i).getMediaType());
    //If you can have multiple file types, set it in ArrayList
                        MultipartBuilder buildernew = new MultipartBuilder().type(MultipartBuilder.FORM)
                                .addFormDataPart("title", title)
                        for (int i = 0; i < AppConstants.arrImages.size(); i++) {
                            File f = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                                    TEMP_FILE_NAME + i + ".png");
                            if (f.exists()) {
                                buildernew.addFormDataPart(TEMP_FILE_NAME + i, TEMP_FILE_NAME + i + FILE_EXTENSION, RequestBody.create(MEDIA_TYPE, f));
                        RequestBody requestBody =;
                        Request request = new Request.Builder()
                                .url(Url.URL + Url.INSERT_NEWS)
                        OkHttpClient client = new OkHttpClient();
                        Response response = client.newCall(request).execute();
                        return response.body().string();

    Dont forget to delete temp. files that you uploaded if it is of no use.

    Here I have created Function to Upload Multiple Images.

     * Here I am uploading MultipleImages from List of photoCaption
     * Sending photoCaption with URL and Caption of Photo...
     * @param albumId
     * @param photoCaptions
     * @return
    public static JSONObject uploadAlbumImage(String albumId, ArrayList<PhotoCaption> photoCaptions) {
        try {
            MultipartBuilder multipartBuilder = new MultipartBuilder().type(MultipartBuilder.FORM);
            int length = photoCaptions.size();
            int noOfImageToSend = 0;
            for(int i = 0; i < length; i++) {
                 * Getting Photo Caption and URL
                PhotoCaption photoCaptionObj = photoCaptions.get(i);
                String photoUrl = photoCaptionObj.getPhotoUrl();
                String photoCaption = photoCaptionObj.getPhotoCaption();
                File sourceFile = new File(photoUrl);
                if(sourceFile.exists()) {
                    /** Changing Media Type whether JPEG or PNG **/
                    final MediaType MEDIA_TYPE = MediaType.parse(FileUtils.getExtension(photoUrl).endsWith("png") ? "image/png" : "image/jpeg");
                    /** Adding in MultipartBuilder **/
                    multipartBuilder.addFormDataPart(KEY_IMAGE_CAPTION + i, photoCaption);
                    multipartBuilder.addFormDataPart(KEY_IMAGE_NAME + i, sourceFile.getName(), RequestBody.create(MEDIA_TYPE, sourceFile));
                    /** Counting No Of Images **/
            RequestBody requestBody = multipartBuilder
                    .addFormDataPart(KEY_ALBUM_ID, albumId)
                    .addFormDataPart(KEY_IMAGE_COUNT, String.valueOf(noOfImageToSend))
            Request request = new Request.Builder()
            OkHttpClient client = new OkHttpClient();
            Response response = client.newCall(request).execute();
            /** Your Response **/
            String responseStr = response.body().string();
            Log.i(TAG, "responseStr : "+ responseStr);
            return new JSONObject(responseStr);
        } catch (UnknownHostException | UnsupportedEncodingException e) {
            Log.e(TAG, "Error: " + e.getLocalizedMessage());
        } catch (Exception e) {
            Log.e(TAG, "Other Error: " + e.getLocalizedMessage());
        return null;

    I hope it will helps you.

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