Simplest way to transfer files from PC to Android device (wireless) What's the simplest way to transfer files (often around 100 MB) from PC to Android device, with wireless connexion ?

Should I use an application for this?

Remark 1 : I want to set "wifi=off" after the file transfer is done, because I never use it except for the file transfer. Moreover I really would like to do a direct transfer PC -> Android device ; no Dropbox or similar tool.

Remark 2 : I have a Samsung Galaxy 3.6 Player YP-GS1CB (limited to Android 2.x as far as I know)

Remark 3 : If possible, I would like to be able to see the Android device's microSD card filesystem from computer, access to subdirectories, copy files there, etc.    Would a FTP server on the Android device be a good way to do it ? If so, with which app?
Airdroid can perform file transfers and it runs on 2.2 and above. 

All features:


SMS: send and receive individual or group messages.
Apps: Import and export .apk files.
Files: Manage files on Android and transferring files between Android and computer.
Photos: View and manage photos on Android and transferring photos between Android and computer.
Music &amp; Videos: Play and manage music &amp; videos on Android and transferring them between Android and computer.
Ringtones: Set music as ringtone and export any ringtone.
Contacts: View and edit all the contacts.
Screenshot: View the real time screen of Android devices, take static screenshots. (root required)
Camera: See through the lens of both front and back camera, also supports flashlight.
URL: Push url to Android and open automatically open it with Android browser.
Clipboard: Share clipboard content between Android and computer.