BaseKeyListener

Kotlin |Java

abstract class BaseKeyListener : MetaKeyKeyListener, KeyListener

kotlin.Any
↳	android.text.method.MetaKeyKeyListener
	↳	android.text.method.BaseKeyListener

Known Direct Subclasses

MultiTapKeyListener, NumberKeyListener, QwertyKeyListener, TextKeyListener

MultiTapKeyListener	This is the standard key listener for alphabetic input on 12-key keyboards.
NumberKeyListener	For numeric text entry
QwertyKeyListener	This is the standard key listener for alphabetic input on qwerty keyboards.
TextKeyListener	This is the key listener for typing normal text.

Known Indirect Subclasses

DateKeyListener, DateTimeKeyListener, DialerKeyListener, DigitsKeyListener, TimeKeyListener

DateKeyListener	For entering dates in a text field.
DateTimeKeyListener	For entering dates and times in the same text field.
DialerKeyListener	For dialing-only text entry
DigitsKeyListener	For digits-only text entry
TimeKeyListener	For entering times in a text field.

Abstract base class for key listeners. Provides a basic foundation for entering and editing text. Subclasses should override onKeyDown and #onKeyUp to insert characters as keys are pressed.

As for all implementations of KeyListener, this class is only concerned with hardware keyboards. Software input methods have no obligation to trigger the methods in this class.

Summary

Inherited constants

From class MetaKeyKeyListener

`Int`	`META_ALT_LOCKED` Flag that indicates that the ALT key is locked.
`Int`	`META_ALT_ON` Flag that indicates that the ALT key is on. Value equals `KeyEvent.META_ALT_ON`.
`Int`	`META_CAP_LOCKED` Flag that indicates that the SHIFT key is locked in CAPS mode.
`Int`	`META_SHIFT_ON` Flag that indicates that the SHIFT key is on. Value equals `KeyEvent.META_SHIFT_ON`.
`Int`	`META_SYM_LOCKED` Flag that indicates that the SYM key is locked.
`Int`	`META_SYM_ON` Flag that indicates that the SYM key is on. Value equals `KeyEvent.META_SYM_ON`.

Public constructors
`BaseKeyListener()`

Public methods
open Boolean	`backspace(view: View!, content: Editable!, keyCode: Int, event: KeyEvent!)` Performs the action that happens when you press the `KeyEvent.KEYCODE_DEL` key in a `TextView`.
open Boolean	`forwardDelete(view: View!, content: Editable!, keyCode: Int, event: KeyEvent!)` Performs the action that happens when you press the `KeyEvent.KEYCODE_FORWARD_DEL` key in a `TextView`.
open Boolean	`onKeyDown(view: View!, content: Editable!, keyCode: Int, event: KeyEvent!)`
open Boolean	`onKeyOther(view: View!, content: Editable!, event: KeyEvent!)` Base implementation handles ACTION_MULTIPLE KEYCODE_UNKNOWN by inserting the event's text into the content.

Inherited functions

From class MetaKeyKeyListener

`Unit`	`adjustMetaAfterKeypress(content: Spannable!)` Call this method after you handle a keypress so that the meta state will be reset to unshifted (if it is not still down) or primed to be reset to unshifted (once it is released).
`Long`	`adjustMetaAfterKeypress(state: Long)` Call this method after you handle a keypress so that the meta state will be reset to unshifted (if it is not still down) or primed to be reset to unshifted (once it is released). Takes the current state, returns the new state.
`Unit`	`clearMetaKeyState(view: View!, content: Editable!, states: Int)`
`Long`	`clearMetaKeyState(state: Long, which: Int)` Clears the state of the specified meta key if it is locked.
`Unit`	`clearMetaKeyState(content: Editable!, states: Int)`
`Int`	`getMetaState(text: CharSequence!)` Gets the state of the meta keys.
`Int`	`getMetaState(text: CharSequence!, event: KeyEvent!)` Gets the state of the meta keys for a specific key event. For input devices that use toggled key modifiers, the `toggled' state is stored into the text buffer. This method retrieves the meta state for this event, accounting for the stored state. If the event has been created by a device that does not support toggled key modifiers, like a virtual device for example, the stored state is ignored.
`Int`	`getMetaState(text: CharSequence!, meta: Int)` Gets the state of a particular meta key.
`Int`	`getMetaState(text: CharSequence!, meta: Int, event: KeyEvent!)` Gets the state of a particular meta key to use with a particular key event. If the key event has been created by a device that does not support toggled key modifiers, like a virtual keyboard for example, only the meta state in the key event is considered.
`Int`	`getMetaState(state: Long)` Gets the state of the meta keys.
`Int`	`getMetaState(state: Long, meta: Int)` Gets the state of a particular meta key.
`Long`	`handleKeyDown(state: Long, keyCode: Int, event: KeyEvent!)` Handles presses of the meta keys.
`Long`	`handleKeyUp(state: Long, keyCode: Int, event: KeyEvent!)` Handles release of the meta keys.
`Boolean`	`isMetaTracker(text: CharSequence!, what: Any!)` Returns true if this object is one that this class would use to keep track of any meta state in the specified text.
`Boolean`	`isSelectingMetaTracker(text: CharSequence!, what: Any!)` Returns true if this object is one that this class would use to keep track of the selecting meta state in the specified text.
`Boolean`	`onKeyUp(view: View!, content: Editable!, keyCode: Int, event: KeyEvent!)` Handles release of the meta keys.
`Unit`	`resetLockedMeta(content: Spannable!)` Call this if you are a method that ignores the locked meta state (arrow keys, for example) and you handle a key.
`Long`	`resetLockedMeta(state: Long)` Call this if you are a method that ignores the locked meta state (arrow keys, for example) and you handle a key.
`Unit`	`resetMetaState(text: Spannable!)` Resets all meta state to inactive.

From class KeyListener

Int

getInputType()

Return the type of text that this key listener is manipulating, as per android.text.InputType. This is used to determine the mode of the soft keyboard that is shown for the editor.

If you return android.text.InputType#TYPE_NULL then no soft keyboard will provided. In other words, you must be providing your own key pad for on-screen input and the key listener will be used to handle input from a hard keyboard.

If you return any other value, a soft input method will be created when the user puts focus in the editor, which will provide a keypad and also consume hard key events. This means that the key listener will generally not be used, instead the soft input method will take care of managing key input as per the content type returned here.

Public constructors

BaseKeyListener

BaseKeyListener()

Public methods

backspace

Added in API level 1

open fun backspace(
    view: View!, 
    content: Editable!, 
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Performs the action that happens when you press the KeyEvent.KEYCODE_DEL key in a TextView. If there is a selection, deletes the selection; otherwise, deletes the character before the cursor, if any; ALT+DEL deletes everything on the line the cursor is on.

Return
`Boolean`	true if anything was deleted; false otherwise.

forwardDelete

Added in API level 11

open fun forwardDelete(
    view: View!, 
    content: Editable!, 
    keyCode: Int, 
    event: KeyEvent!
): Boolean

Performs the action that happens when you press the KeyEvent.KEYCODE_FORWARD_DEL key in a TextView. If there is a selection, deletes the selection; otherwise, deletes the character before the cursor, if any; ALT+FORWARD_DEL deletes everything on the line the cursor is on.

Return
`Boolean`	true if anything was deleted; false otherwise.

onKeyDown

Added in API level 1

open fun onKeyDown(
    view: View!, 
    content: Editable!, 
    keyCode: Int, 
    event: KeyEvent!
): Boolean

onKeyOther

Added in API level 3

open fun onKeyOther(
    view: View!, 
    content: Editable!, 
    event: KeyEvent!
): Boolean

Base implementation handles ACTION_MULTIPLE KEYCODE_UNKNOWN by inserting the event's text into the content.