1. Lab 3: More Phone-Based Techniques
MIT D-Lab ICT4D
Lab 3: More Phone-Based Techniques
Luis F. G. Sarmenta
draft 1: 4/10/2008

2. Recap: What can you do with mobile phones?
Computation / logic
general-purpose language
limited only by processor speed and memory
Multimedia
Graphics
3D Graphics on new phones
Camera
Audio / Video recording and playback
Connectivity
SMS, MMS, Bluetooth, HTTP
connect to server-based resources/services
connect to other users
Other Features
NFC / RFID
Location / GPS
Sensors (e.g., accelerometer)

3. More References Examples
Note: Our lab sessions for this class are only meant to jump-start you and get you on your way. You should read further on your own!
Recommended Books
Li and Knudsen. Beginning J2ME: From Novice to Professional, Third Edition. Publisher: Apress. (
Hamer. Creating Mobile Games. Publisher: Apress. (
Examples
The Sun Wireless Toolkit has many examples!
See also
See also source code downloads available from Apress
See also
Some Lecture Notes by others

4. More References forum.nokia.com non-Java alternatives
SDKs, includes emulators, support for Nokia-specific features
non-Java alternatives
Symbian
“S60” or “Series 60” is a platform version of Symbian
“native” code – faster, and more features
harder to code in, and less portable
Python
runs on Symbian-based Nokia phones
Pros
may be easier to program
may provide access to more features
Cons
limited to Symbian phones
not easy to install for end-users

5. Generic Connection Framework

6. Connector and Connections
Many Features in J2ME MIDP are accessed via the Generic Connection Framework
Different classes implementing a subtype of interface Connection
HttpConnection
MessageConnection (SMS,MMS)
SocketConnection
StreamConnection
etc.

7. General Pattern Call Connector.open( url ) to get a Connection
url specifies connection type
Cast Connection to appropriate type
Each Connection type has specific methods
Open streams (input and output)

8. Other Features

9. Camera Part of Media API Camera is played like Video
To take photo, get snapshot of Video

10. Location Location API presents an abstraction Specify Criteria c
Then call LocationProvider.getInstance(c);

11. NFC (Contactless) NFC – Near Field Communications
communicate with contactless / “RFID” devices
Supported by Nokia 6131 NFC phone and a few others
Reading Unique ID is simple
You can also send more complex commands to the NFC
Download Nokia 6131 NFC SDK from forum.nokia.com
Get NFC tags from Rich Fletcher