Can I use my Android device for wireless multitouch?

Hi ethana2

I don't think the Android devices provide an HID (Human interface device) bluetooth profile just yet. Maybe 2.2 devices do ? You could provide us with the output of such profiles on your device:
1) Install the bluez package
2) Find out what MAC address corresponds to your phone:
hcitool scan
3) Find out which bluetooth profiles it povides:
$ sdptool browse XX:XX:XX:XX:XX:XX

On the Apple Magic Mouse, this is the result:

Browsing XX:XX:XX:XX:XX:XX...
Service Name: Apple Wireless Mouse
Service Description: Apple Wireless Mouse
Service Provider: Apple Inc.
Service RecHandle: 0x10000
Service Class ID List:
  "Human Interface Device" (0x1124)
Protocol Descriptor List:
  "L2CAP" (0x0100)
    PSM: 17
  "HIDP" (0x0011)
Language Base Attr List:
  code_ISO639: 0x656e
  encoding: 0x6a
  base_offset: 0x100
Profile Descriptor List:
  "Human Interface Device" (0x1124)
    Version: 0x0100

Here is the output I got on a Nexus One running Android 2.1 - as you can see there is no HID profile:

Browsing XX:XX:XX:XX:XX:XX ...
Service RecHandle: 0x10000
Service Class ID List:
  "PnP Information" (0x1200)
Profile Descriptor List:
  "PnP Information" (0x1200)
    Version: 0x0102

Service Name: Audio Source
Service RecHandle: 0x10001
Service Class ID List:
  "Audio Source" (0x110a)
Protocol Descriptor List:
  "L2CAP" (0x0100)
    PSM: 25
  "AVDTP" (0x0019)
    uint16: 0x100
Profile Descriptor List:
  "Advanced Audio" (0x110d)
    Version: 0x0100

Service Name: AVRCP TG
Service RecHandle: 0x10002
Service Class ID List:
  "AV Remote Target" (0x110c)
Protocol Descriptor List:
  "L2CAP" (0x0100)
    PSM: 23
  "AVCTP" (0x0017)
    uint16: 0x100
Profile Descriptor List:
  "AV Remote" (0x110e)
    Version: 0x0100

Service Name: Voice Gateway
Service RecHandle: 0x10003
Service Class ID List:
  "Handsfree Audio Gateway" (0x111f)
  "Generic Audio" (0x1203)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 10
Profile Descriptor List:
  "Handsfree" (0x111e)
    Version: 0x0105

Service Name: Voice Gateway
Service RecHandle: 0x10004
Service Class ID List:
  "Headset Audio Gateway" (0x1112)
  "Generic Audio" (0x1203)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 11
Profile Descriptor List:
  "Headset" (0x1108)
    Version: 0x0100

Service Name: OBEX Object Push
Service RecHandle: 0x10005
Service Class ID List:
  "OBEX Object Push" (0x1105)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 12
  "OBEX" (0x0008)
Profile Descriptor List:
  "OBEX Object Push" (0x1105)
    Version: 0x0100

Service Name: OBEX Phonebook Access Server
Service RecHandle: 0x10006
Service Class ID List:
  "Phonebook Access - PSE" (0x112f)
Protocol Descriptor List:
  "L2CAP" (0x0100)
  "RFCOMM" (0x0003)
    Channel: 19
  "OBEX" (0x0008)
Profile Descriptor List:
  "Phonebook Access" (0x1130)
    Version: 0x0100

I hope this answers your question, I'll gladly be corrected if this can be achieved otherwise.

I've created an input server called rinputd and a client for the iPhone called Remotux. I haven't updated Remotux to send raw multitouch events to the server yet, but I will soon as it's trivial.

If someone were to create a version of Remotux for Android, then that would be all you need. The rinputd server and protocol are documented at https://wiki.ubuntu.com/RemoteInput.