Chapter 3. The Mobile InformationDevice Profile (MIDP)
The Mobile Information Device Profile
(MIDP) is built on top of the CLDC, and defines an open application
development environment for what Sun calls
Information Devices (MIDs). In simpler terms, MIDP is the
J2ME profile that is used for wireless devices, such as mobile phones
and pagers. This chapter expands on the previous chapter by
introducing some of the fundamental concepts of MIDP and offering
programming guidelines that are used throughout the remainder of this
As we mentioned in Chapter 1, the MIDP is governed by the Java Community Process. The MIDP is JSR 37, which is part of the Java Community Process. Like the CLDC, the MIDP is an ever-changing standard that actively solicits input from corporations and the general programming community. You can find more information on the MIDP at the following URL: http://java.sun.com/products/midp.
Mobile Information Devices
Again, let’s start off with some specifics. The MIDP standard defines a MID as a device with the following minimum characteristics:
A screen size of at least 96 x 54 pixels with at least a 1-bit display depth
A one-handed keyboard, two-handed keyboard, or touch screen
32 KB of volatile memory for the Java runtime (heap); 128 KB of non-volatile memory for the MIDP components; and 8 KB of non-volatile memory for application-created persistent data
A two-way intermittent connection, usually wireless, with limited ...