MIDlets

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The Mobile Information Device Profile (MIDP) is a set of Java APIs targeted at mobile information devices such as mobile phones and entry-level palmtop devices. A MIDlet is a MIDP application. Throughout this article, the terms MIDlet and MID application are used interchangeably. MIDlets form the building blocks of the Java 2 Platform, Micro Edition (J2ME) runtime environment.

The MIDlet is designed to be run and controlled by the application manager in the K Virtual Machine (KVM), a stripped-down version of the Java Virtual Machine designed to run on mobile devices. The javax.microedition.midlet.MIDlet class acts as an interface between the MIDlet and the application manager. The methods of this class allow the application manager to create, start, pause, and destroy a MIDlet.

J2ME applications must extend the javax.microedition.midlet.MIDlet class, which provides a framework for the following actions:

• To allow the application manager to control the MIDlet by notifying and requesting MIDlet state changes.
• To allow the MIDlet to retrieve properties from the application descriptor, a registry of applications maintained by the application manager.