title: periodic wifi scan and export result to a txt file
body: <p>I want to make periodic wifi scan(maybe every 5 mins) and export result to a txt file, so it shows the AP SSID and MAC and Signal Strength received.
  I'm very new to Android development so I only know the basics.
  my progress for now is copying the same exact steps in this <a href="http://androidexample.com/Scan_wifi_connections_or_Get_number_of_available_wifi_connections/index.php?view=article_discription&amp;aid=90&amp;aaid=114" rel="nofollow">this</a>link.</p>