title: Android activity to show a directory explorer to browse content of sdcard
body: <p>In android, is there an activity show a directory explorer to browse content of sdcard ?
  Like a File explorer in Java, it can show the content of current directory and I can move up to its parent by clicking '..' and move down to a child directory by clicking the name of the child directory?</p>
  
  <p>Thank you.</p>