Have you worked with documents confirming military service?

As a rule, in Android application development, developers do not work directly with documents confirming military service, unless it is a specialized application for the military sector or government services. However, if the application requires uploading or processing such documents, it usually involves working with files (e.g., PDFs, images) through standard APIs for reading, storing, and displaying documents.

Example: uploading a document image via Intent and displaying it in an ImageView.

val intent = Intent(Intent.ACTION_PICK)
intent.type = "image/*"
startActivityForResult(intent, REQUEST_CODE)

// In onActivityResult
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if (requestCode == REQUEST_CODE && resultCode == Activity.RESULT_OK) {
        val uri = data?.data
        imageView.setImageURI(uri)
    }
}

Thus, working with such documents boils down to processing files and displaying or sending them to a server.