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Please help!
I need to develop a mobile app (either Android or iOS) to do the following:

1- open up a pdf file with zoom capabilities,
2- there be three input boxes on top of the screen in a row,
3- when user clicks/touches any spot within the Pdf, then App marks the spot with "x" and then extracts the x and y coordinates of the spot and enters the values into the first and second boxes.
4- the user enters a numeric value (z coordinate) in the third box and the same value be recorded next to the "x" mark on the pdf.
5- App saves the pdf file with spot marks and related "z" coordinate as annotations, as well as exporting all the values (x,y,z coordinates for each and every spots) as CSV format.

What I have tried:

I'm a beginner and need guidance on how to do this. I appreciate your advice/suggestion/recommendation/input. Even it would be great if someone could develop the basics and I further develop the details. Thanks a lot!
Updated 17-May-20 21:25pm

1 solution

The first thing you need to do is to decide which platform you are going to target. If iOS then you need to learn Swift, if Android then you need to learn Java. If you want cross-platform support then you need C# and Xamarin forms.
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