Code for https://developers.facebook.com/bugs/422732214727758

KPCExplorer.java

public static void PostToGroup(final Activity activity, final byte[] image, final String caption, final PostDelegate postDelegate)              
    {
            String post_request = "/" + "1631546380475418";
        if(image != null) post_request +=  "/photos";
        else post_request += "/feed";
            Bundle params = new Bundle();
            params.putString("message", caption);
            if(image != null) params.putByteArray("source", image);
            FacebookSdk.setOnProgressThreshold(1l);
            GraphRequest.OnProgressCallback gCallBack = new GraphRequest.OnProgressCallback() {
                @Override
                public void onProgress(long current, long max) {
                    Log.d("ONProgress", "onProgress() called with: current = [" + current + "], max = [" + max + "]");
                    int progress = Math.round((current * 100) / max);
                    Log.d("Progress: " ,String.valueOf(progress));
                }

                @Override
                public void onCompleted(GraphResponse response) {
                    JSONObject jsonObject = response.getJSONObject();
                    if(jsonObject != null && jsonObject.has("id")) {
                        postDelegate.onSuccess(jsonObject.optString("id"));
                    }
                    else
                    {
                        postDelegate.onError();
                    }
                }
            };

            final GraphRequest graphRequest = new GraphRequest(
                    AccessToken.getCurrentAccessToken(),
                    post_request,
                    params,
                    HttpMethod.POST,
                    gCallBack);

            graphRequest.executeAsync();
    }

public void PostButtonClick(View v){
  //KPCExplorer.internet is a boolean to check for internet connection
        if (KPCExplorer.internet) {
            if (!facebookManager.hasPublishPermission()) {
                    getPublishPermission(((PostPhoto) mContext), new FacebookManager.PostDelegate() {
                        @Override
                        public void onSuccess(LoginResult loginResult) {
                            //photoBitmap has the photo to be uploaded
                            Toasty.success(mContext, "Login Successful", Toast.LENGTH_SHORT, true).show();
                            if(photoBitmap !=null){
                            ByteArrayOutputStream stream = new ByteArrayOutputStream();
                            photoBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
                            byte[] byteArray = stream.toByteArray();
                            PostPhotoService.bitmapArray = byteArray;
                            PostPhotoService.caption = caption.getText().toString();
                            Intent intent = new Intent(getBaseContext(), PostPhotoService.class);
                            startService(intent);
                            }else{
                                PostToGroup((PostPhoto) mContext, null, caption.getText().toString(), new PostDelegate() {
                                    @Override
                                    public void onSuccess(String id) {
                                        Toasty.success(mContext, "Your post has been posted", Toast.LENGTH_SHORT,true).show();
                                    }

                                    @Override
                                    public void onError() {
                                        Toasty.error(mContext, "An error occurred while posting", Toast.LENGTH_SHORT,true).show();
                                    }
                                });
                            }
                        }

                        @Override
                        public void onCancel() {
                            Toasty.info(mContext, "Login Cancelled", Toast.LENGTH_SHORT, true).show();
                        }

                        @Override
                        public void onError(FacebookException error) {
                            Toasty.error(mContext, "Login Error", Toast.LENGTH_SHORT, true).show();
                        }
                    });

            }
            else if (facebookManager.hasPublishPermission()) {
                if(photoBitmap != null){
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                photoBitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
                byte[] byteArray = stream.toByteArray();
                PostPhotoService.bitmapArray = byteArray;
                PostPhotoService.caption = caption.getText().toString();
                Intent intent = new Intent(getBaseContext(), PostPhotoService.class);
                startService(intent);}
                else{
                    PostToGroup((PostPhoto) mContext, null, caption.getText().toString(), new PostDelegate() {
                        @Override
                        public void onSuccess(String id) {
                            Toasty.success(mContext, "Your post has been posted", Toast.LENGTH_SHORT,true).show();
                        }

                        @Override
                        public void onError() {
                            Toasty.error(mContext, "An error occurred while posting", Toast.LENGTH_SHORT,true).show();
                        }
                    });
                }
            }
        }
        else
        {
            Toasty.info(this, "Please connect to the internet", Toast.LENGTH_SHORT, true).show();
        }

    }



    public static class PostPhotoService extends IntentService {

        public static  byte[] bitmapArray;
        public static  String caption;
        private boolean failed = true;
        public PostPhotoService(){
            super("PostPhotoService");
        }

        @Nullable
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }

        @Override
        protected void onHandleIntent(Intent intent) {

            Intent notificationIntent = new Intent(this, MainActivity.class);
            PendingIntent contentIntent = PendingIntent.getActivity(this, 1, notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

        }

        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {

            notificationManager.Update("Uploading Photo", "Your photo will be uploaded in a while", true);
            final Snackbar snackbar = Snackbar.make(post_photo_layout, "Started photo upload", Snackbar.LENGTH_SHORT);
            ((TextView)snackbar.getView().findViewById(android.support.design.R.id.snackbar_text)).setTextColor(Color.GREEN);
            snackbar.show();
            PostToGroup((PostPhoto) mContext, bitmapArray, this.caption, new PostDelegate() {
                @Override
                public void onSuccess(String id) {
                    Toasty.success(mContext, "Your photo has been posted", Toast.LENGTH_SHORT,true).show();
                    notificationManager.Update("Photo uploaded", "Your photo has been uploaded",false);
                
                    failed = false;
                    stopSelf();
                }

                @Override
                public void onError() {
                    Toasty.error(mContext, "An error occurred while uploading your photo", Toast.LENGTH_SHORT,true).show();
                    notificationManager.Update("Uploading Photo Failed!", "Your photo wasn't uploaded",false);
                    failed = true;
                    stopSelf();
                }
            });
            return START_NOT_STICKY;
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            if(failed)
            {
                notificationManager.Update("Uploading Photo Failed!", "Your photo wasn't uploaded",false);

            }
        }
    }