Common json interface for Android / Java

I am writing an Android application that can export the current state Activityor Fragmentto a JSON file, which has the following general format:

{
  "data": {
    "result": {
      <content depends on specific class>
    },
    "input": {
      <content depends on specific class>
    }
  },
  "identifier": <identifier depends on specific class>,
  "version": 1
}

This means that Activities/ Fragments, which have the ability to export the filling with marked content, implements the interface that I called "Exportable", and the general export function calls the methods defined in the interface. This is a complex solution that works quite well.

So far so good. Now I want to do the opposite direction. I want to upload a file and call the appropriate Activity/ Fragmentdepending on the contents of the identifier.

"" "" Activity/Fragment.

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