Is it possible to merge pdf files into one with mupdf on android?

Question

I have many one page pdf files and I would like to merge it into one pdf file with mupdf library on android device. Is this possible?

If it is not possible, can you recommend something else that I can use on android?

Note: all pdf files are encrypted and the resulting pdf file must be also encrypted.

Answer 1

While the MuPDF library, on which the viewer is based, is capable of such a feat the viewer application cannot currently combine PDF files.

I'm not aware of any tool which will combine PDF files and runs on Android, though I could easily be wrong.

As regards encryption, you are going to have to decrypt all the input files, and encrypt the final file as separate operations. So in addition to a UI which allows you to specify multiple input files, the order in which they are to be combined (and indeed, potentially, the order in which pages from each are to be used), you also need to be able to specify passwords for decryption and a final encryption methodology. Quite a complex UI.