PhotoUtil | Camera photos , Gallery photos | Computer Vision library

I am Building an App to Upload Images to my company server I am now working on Taking multiple images and converting them to PDF so images that are part of the same document can stay together

My Problem is I have No Idea How to make It so I can Add multiple images to the PDF creation I am Using a android Library PhotoUtils By Kosal Geek for Image processing and PDFdocument to create the pdf

At the moment a single image works but if I select Multiple images I get A null Pointer exception

Main Code

I have a 2 fragments in 1 activity, namely, fragment A and fragment B.

From fragment A, I move to fragment B with button (add fragment) and in fragment B I use startActivityOnResult() to intent image capture / camera.

Can I call onActivityOnresult in fragment A?

I want to finish the fragment B, so I get the imageUri on fragment A.

I have tried the following in fragment B, but not working

getActivity().getSupportFragmentManager().beginTransaction().remove(this).commit();

Can you guys tell me how to do it properly?

Here is my code:

Fragment A :

I would like to put in a string from a different class into the following code:

I have code that is designed to take a raw image, process it asynchronously, and let the user see their processed image. Sometimes, the image processing causes an OutOfMemory error, and I would then like to notify the user that their devices is out of memory.

I am getting a crash, however, when trying to catch the error and notify the subscriber. Furthermore, when I put breakpoints in the code, the OutOfMemory error is being caught, and the subscriber.onError(e) line is hit, but the onPhotoProcessingError(e) is never reached.

Here is where the subscription occurs:

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