Control objects are used for controlling content-type-specific media processing operations. The set of operations are usually functionally related. Thus a Control object provides a logical grouping of media-processing functions.
All Control classes implement the interface Controllable, and the Player interface is a subinterface of Controllable. Therefore, a Player implementation can use the Control interface to extend its media-processing functions. For example, a Player can expose a VolumeControl to allow the volume level to be set.
The javax.microedition.media.control package specifies a set of predefined Controls classes. In MIDP 2.0, two controls are specified and required: ToneControl and VolumeControl.
The Controllable ...