pass extra trough activity result is always null

Question

I am trying to pass a unique id between activity, so i do something like this on activity1:

    Intent i = new Intent(this,FotosForPlant.class);
    i.putExtra("plantId",id);
    startActivity(i);

on the FotosForPlant acitivity oncreate i should receive the extra with the plantId.

So i did this:

String id = getIntent().getExtras().getString("plantId");

but i keep get a null value from the key, as you guys can see the keys are the same, what is going on? :S