Question

From ActivityA I’m starting ActivityB.
In ActivityB I’m creating a new Serializable object.
After the object has been created I want to close ActivityB and pass the new object to ActivityA.

How can I do it?

Answer 1

start Activity B with startActivityForResult().
In activity B, when the object is created create an Intent to pack the object in:

Intent result = new Intent();
result.putExtra("result", object);
setResult(RESULT_OK, result);

Then you will receive that intent in the onActivityResult() method of Activity A, where you can extract it like so:

data.getSerializableExtra("result");