Android: How to pass the data to sub-activities?

Question

The main activity includes some variables with set values. I created a sub-activity with the form which has to be filled with the data from main activity so I guess the data

Answer 1

Will this work in the main activity?

Intent i = new Intent(this, YourMainClass.class);
i.putExtra("key", value);

Followed by:

String value = getIntent().getExtras().getString("key");

And can you add multiple "Extras" like or something like this?

i.putExtra("key", value1); 
i.putExtra("key2", value2);
i.putExtra("key3", value3);

Thanks...