Back button and refreshing previous activity
<p>If we have two activities:</p>

<ol>
<li>List of files and last modified time</li>
<li>File editing activity</li>
</ol>

<p>A user selects a file from the list and is taken to the file editing activity. When done editing, the user presses the back button to return to the file list.</p>

<p>The list is not reloaded and therefore an incorrect value is displayed for the just edited files modified time.</p>

<p>What is the proper method of causing the file list to refresh after the back button is pressed? </p>

<p>This example assumes that no database is being used, just an ArrayAdapter.</p>
