Back button and refreshing previous activity

Question

If we have two activities:

1. List of files and last modified time
2. File editing activity

A user selects a file from the list and is taken

Answer 1

If you want to refresh previous activity, this solution should work:

In previous activity where you want to refresh:

@Override
public void onRestart()
{
    super.onRestart();
    // do some stuff here
}