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User Display Interface
Volume Key
Volume keys will not be supported in the first release of J2ME, Java 1.0. In following releases, when the Volume key (s) is pressed and held down, it should always control the speaker/ accessory volume regardless of application.
Game Key Mapping
Games require the use of UP/DOWN/LEFT/RIGHT and FIRE as a basic set of keys in order to play. For handsets that have a four direction navigational device (joystick), UP/DOWN/LEFT/ RIGHT should be mapped to that. Otherwise, the keypad should return game action by mapping the 2 key to UP command, 8 key to DOWN command, 4 key to LEFT command, and 6 key to RIGHT command. In addition, the FIRE key should be mapped to the SELECT key if present otherwise to the right soft key and the 5 key. Additional game action keys exist, these are the GAME A, GAME B, GAME C, and GAME D keys. They perform different game actions depending on the game being played. GAME A should be mapped to the 1 key. GAME B should be mapped to the 3 key. GAME C should be mapped to the 7 key. GAME D should be mapped to the 9 key. For hardware implementations that support multiple key presses, such as Talon, the following keys must be supported when pressed simultaneously: Four direction navigational device (i.e. joystick), 1, 3, 5, 7, & 9 keys.
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