[SelectPathActivity]WebService && UI

a. Fix ListView and Bottom Form of SelectPathActivity
relative position at RelativeLayout.
b. Add onListItemClicked event handle, go into the clicked
folder item. And list its sub folders.

Signed-off-by: Ethan Shan <shan0xiao0xi@gmail.com>
[SelectPathActivity]Set list view empty widget

Signed-off-by: Ethan Shan <shan0xiao0xi@gmail.com>