Accomodate changes in file list API in the server
Make the FilesView a fragment.

This will help in making sliding tabs using ViewPager.
Rename strings.xml to strings_activity_main.xml
Use ViewPager to allow swiping between tabs
Remove unnecessary autogenerated code
Add context menu in the files list view
Add sub directory navigation
Add header to the files list view
Set the header text and the 'Up to' text correctly
Save and restore Client settings
Forgot to add the listview header layout file
Client now return a Response object to allow cancellation
Remove API to get the password
Show a modal progress bar to show login progress
Show alert message if a file cannot be previewed by any app
Use ListView.getItemAtPosition instead of adapter.getItem()

The ListView header offsets the positions by 1. Querying the adapter
directly won't work since the ListView decorates our adapter with
another one.
Implement file delete

Also, retab all the things!
Implement file rename
Implement move

The popup dialog does not have the disabled color for file items.
Use ListViewFragment instead of Fragment

This gives us empty-text and progress indicator for free.