KeyListener (Java(TM) ME Embedded Profile, Final Release)

```
public interface KeyListener
```
Classes implementing this interface provide methods that are called when user of the device will generate key events, for example, pressing the keys available in a system keypad or keyboard. When a key is pressed, held down or released, the appropriate method will be invoked. The methods have following parameters:
- keyCode: keyCodes often represent the character of the key that was typed. This is the final character that results after all modifiers have been applied.
- keyModifier: carries the key modifier (Alt, Shift, Ctrl, Chr etc.) information. Modifier keys are only available in some devices, especially those with full keyboards.
Since:

MEEP-8.0.0

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`DOWN` Constant for the `DOWN` action.
`static int`	`KEY_BACKSPACE` keyCode for the backspace key, U+0008 BACKSPACE.
`static int`	`KEY_DELETE` keyCode for the delete key, U+007F DELETE.
`static int`	`KEY_DOWN` keyCode for the down key.
`static int`	`KEY_ENTER` keyCode for the enter key, U+000A LINE FEED.
`static int`	`KEY_ESCAPE` keyCode for the escape key, U+001B ESCAPE.
`static int`	`KEY_LEFT` keyCode for the left key.
`static int`	`KEY_NUM0` keyCode for ITU-T key `0`.
`static int`	`KEY_NUM1` keyCode for ITU-T key `1`.
`static int`	`KEY_NUM2` keyCode for ITU-T key `2`.
`static int`	`KEY_NUM3` keyCode for ITU-T key `3`.
`static int`	`KEY_NUM4` keyCode for ITU-T key `4`.
`static int`	`KEY_NUM5` keyCode for ITU-T key `5`.
`static int`	`KEY_NUM6` keyCode for ITU-T key `6`.
`static int`	`KEY_NUM7` keyCode for ITU-T key `7`.
`static int`	`KEY_NUM8` keyCode for ITU-T key `8`.
`static int`	`KEY_NUM9` keyCode for ITU-T key `9`.
`static int`	`KEY_POUND` keyCode for ITU-T key "pound" (`#`).
`static int`	`KEY_RIGHT` keyCode for the right key.
`static int`	`KEY_SELECT` keyCode for the select key.
`static int`	`KEY_SPACE` keyCode for the space key, U+0020 SPACE.
`static int`	`KEY_STAR` keyCode for ITU-T key "star" (`*`).
`static int`	`KEY_TAB` keyCode for the tabulation key, U+0009 HORIZONTAL TABULATION.
`static int`	`KEY_UP` keyCode for the up key.
`static int`	`LEFT` Constant for the `LEFT` action.
`static int`	`MODIFIER_ALT` Key modifier mask indicating the Alt key.
`static int`	`MODIFIER_CHR` Key modifier mask indicating the Chr key.
`static int`	`MODIFIER_COMMAND` Key modifier mask indicating the Command key.
`static int`	`MODIFIER_CTRL` Key modifier mask indicating the Control / Ctrl key.
`static int`	`MODIFIER_MASK` A bitmask for all key modifiers.
`static int`	`MODIFIER_SHIFT` Key modifier mask indicating the SHIFT key.
`static int`	`RIGHT` Constant for the `RIGHT` action.
`static int`	`UP` Constant for the `UP` action.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`keyPressed(InputDevice source, int keyCode, int keyModifier)` Called when a key is pressed.
`void`	`keyReleased(InputDevice source, int keyCode, int keyModifier)` Called when a key is released.
`void`	`keyRepeated(InputDevice source, int keyCode, int keyModifier)` Called when a key is repeated (held down).

- Field Detail
  - UP
```
static final int UP
```
    Constant for the UP action.
    Constant value 1 is set to UP.
    
    See Also:
    Constant Field Values
  - DOWN
```
static final int DOWN
```
    Constant for the DOWN action.
    Constant value 6 is set to DOWN.
    
    See Also:
    Constant Field Values
  - LEFT
```
static final int LEFT
```
    Constant for the LEFT action.
    Constant value 2 is set to LEFT.
    
    See Also:
    Constant Field Values
  - RIGHT
```
static final int RIGHT
```
    Constant for the RIGHT action.
    Constant value 5 is set to RIGHT.
    
    See Also:
    Constant Field Values
  - KEY_NUM0
```
static final int KEY_NUM0
```
    keyCode for ITU-T key 0.
    Constant value 48 is set to KEY_NUM0.
    
    See Also:
    Constant Field Values
  - KEY_NUM1
```
static final int KEY_NUM1
```
    keyCode for ITU-T key 1.
    Constant value 49 is set to KEY_NUM1.
    
    See Also:
    Constant Field Values
  - KEY_NUM2
```
static final int KEY_NUM2
```
    keyCode for ITU-T key 2.
    Constant value 50 is set to KEY_NUM2.
    
    See Also:
    Constant Field Values
  - KEY_NUM3
```
static final int KEY_NUM3
```
    keyCode for ITU-T key 3.
    Constant value 51 is set to KEY_NUM3.
    
    See Also:
    Constant Field Values
  - KEY_NUM4
```
static final int KEY_NUM4
```
    keyCode for ITU-T key 4.
    Constant value 52 is set to KEY_NUM4.
    
    See Also:
    Constant Field Values
  - KEY_NUM5
```
static final int KEY_NUM5
```
    keyCode for ITU-T key 5.
    Constant value 53 is set to KEY_NUM5.
    
    See Also:
    Constant Field Values
  - KEY_NUM6
```
static final int KEY_NUM6
```
    keyCode for ITU-T key 6.
    Constant value 54 is set to KEY_NUM6.
    
    See Also:
    Constant Field Values
  - KEY_NUM7
```
static final int KEY_NUM7
```
    keyCode for ITU-T key 7.
    Constant value 55 is set to KEY_NUM7.
    
    See Also:
    Constant Field Values
  - KEY_NUM8
```
static final int KEY_NUM8
```
    keyCode for ITU-T key 8.
    Constant value 56 is set to KEY_NUM8.
    
    See Also:
    Constant Field Values
  - KEY_NUM9
```
static final int KEY_NUM9
```
    keyCode for ITU-T key 9.
    Constant value 57 is set to KEY_NUM09.
    
    See Also:
    Constant Field Values
  - KEY_STAR
```
static final int KEY_STAR
```
    keyCode for ITU-T key "star" (*).
    Constant value 42 is set to KEY_STAR.
    
    See Also:
    Constant Field Values
  - KEY_POUND
```
static final int KEY_POUND
```
    keyCode for ITU-T key "pound" (#).
    Constant value 35 is set to KEY_POUND.
    
    See Also:
    Constant Field Values
  - KEY_UP
```
static final int KEY_UP
```
    keyCode for the up key.
    Constant value -1 is set to KEY_UP.
    
    See Also:
    Constant Field Values
  - KEY_DOWN
```
static final int KEY_DOWN
```
    keyCode for the down key.
    Constant value -2 is set to KEY_DOWN.
    
    See Also:
    Constant Field Values
  - KEY_LEFT
```
static final int KEY_LEFT
```
    keyCode for the left key.
    Constant value -3 is set to KEY_LEFT.
    
    See Also:
    Constant Field Values
  - KEY_RIGHT
```
static final int KEY_RIGHT
```
    keyCode for the right key.
    Constant value -4 is set to KEY_RIGHT.
    
    See Also:
    Constant Field Values
  - KEY_SELECT
```
static final int KEY_SELECT
```
    keyCode for the select key.
    Constant value -5 is set to KEY_SELECT.
    
    See Also:
    Constant Field Values
  - KEY_ENTER
```
static final int KEY_ENTER
```
    keyCode for the enter key, U+000A LINE FEED.
    Constant value 10 is set to KEY_ENTER.
    
    See Also:
    Constant Field Values
  - KEY_SPACE
```
static final int KEY_SPACE
```
    keyCode for the space key, U+0020 SPACE.
    Constant value 32 is set to KEY_SPACE.
    
    See Also:
    Constant Field Values
  - KEY_BACKSPACE
```
static final int KEY_BACKSPACE
```
    keyCode for the backspace key, U+0008 BACKSPACE.
    Constant value 8 is set to KEY_BACKSPACE.
    
    See Also:
    Constant Field Values
  - KEY_DELETE
```
static final int KEY_DELETE
```
    keyCode for the delete key, U+007F DELETE.
    Constant value 127 is set to KEY_DELETE.
    
    See Also:
    Constant Field Values
  - KEY_ESCAPE
```
static final int KEY_ESCAPE
```
    keyCode for the escape key, U+001B ESCAPE.
    Constant value 27 is set to KEY_ESCAPE.
    
    See Also:
    Constant Field Values
  - KEY_TAB
```
static final int KEY_TAB
```
    keyCode for the tabulation key, U+0009 HORIZONTAL TABULATION.
    Constant value 9 is set to KEY_TAB.
    
    See Also:
    Constant Field Values
  - MODIFIER_ALT
```
static final int MODIFIER_ALT
```
    Key modifier mask indicating the Alt key.
    
    See Also:
    Constant Field Values
  - MODIFIER_SHIFT
```
static final int MODIFIER_SHIFT
```
    Key modifier mask indicating the SHIFT key.
    
    See Also:
    Constant Field Values
  - MODIFIER_CTRL
```
static final int MODIFIER_CTRL
```
    Key modifier mask indicating the Control / Ctrl key.
    
    See Also:
    Constant Field Values
  - MODIFIER_COMMAND
```
static final int MODIFIER_COMMAND
```
    Key modifier mask indicating the Command key.
    
    See Also:
    Constant Field Values
  - MODIFIER_CHR
```
static final int MODIFIER_CHR
```
    Key modifier mask indicating the Chr key.
    
    See Also:
    Constant Field Values
  - MODIFIER_MASK
```
static final int MODIFIER_MASK
```
    A bitmask for all key modifiers. Not initialized in the declaration to stop the compiler from inlining the value.
    
    See Also:
    Constant Field Values
- Method Detail
  - keyPressed
```
void keyPressed(InputDevice source,
              int keyCode,
              int keyModifier)
```
    Called when a key is pressed.
    
    Parameters:
    source - the InputDevice on which the key has been pressed
    keyCode - the key code of the key that was pressed
    keyModifier - the key modifier mask of the modifier key that was pressed
  - keyReleased
```
void keyReleased(InputDevice source,
               int keyCode,
               int keyModifier)
```
    Called when a key is released.
    
    Parameters:
    source - the InputDevice on which the key has been released
    keyCode - the key code of the key that was released
    keyModifier - the key modifier mask of the modifier key that was released
  - keyRepeated
```
void keyRepeated(InputDevice source,
               int keyCode,
               int keyModifier)
```
    Called when a key is repeated (held down).
    
    Parameters:
    source - the InputDevice on which the key has been held down
    keyCode - the key code of the key that was held down
    keyModifier - the key modifier mask of the modifier key that was held down

Interface KeyListener

Field Summary

Method Summary

Field Detail

UP

DOWN

LEFT

RIGHT

KEY_NUM0

KEY_NUM1

KEY_NUM2

KEY_NUM3

KEY_NUM4

KEY_NUM5

KEY_NUM6

KEY_NUM7

KEY_NUM8

KEY_NUM9

KEY_STAR

KEY_POUND

KEY_UP

KEY_DOWN

KEY_LEFT

KEY_RIGHT

KEY_SELECT

KEY_ENTER

KEY_SPACE

KEY_BACKSPACE

KEY_DELETE

KEY_ESCAPE

KEY_TAB

MODIFIER_ALT

MODIFIER_SHIFT

MODIFIER_CTRL

MODIFIER_COMMAND

MODIFIER_CHR

MODIFIER_MASK

Method Detail

keyPressed

keyReleased

keyRepeated