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

I would recommend overriding the onResume() method in activity number 1, and in there include code to refresh your array adapter, this is done by using [yourListViewAdapater].notifyDataSetChanged();

Read this if you are having trouble refreshing the list: Android List view refresh