NumberKeyListener

Kotlin |Java

abstract class NumberKeyListener : BaseKeyListener, InputFilter

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

Known Direct 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.

For numeric text entry

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
`NumberKeyListener()`

Public methods
open CharSequence!	`filter(source: CharSequence!, start: Int, end: Int, dest: Spanned!, dstart: Int, dend: Int)` This method is called when the buffer is going to replace the range `dstart dend` of `dest` with the new text from the range `start end` of `source`.
open Boolean	`onKeyDown(view: View!, content: Editable!, keyCode: Int, event: KeyEvent!)` Handles presses of the meta keys.

Protected methods
abstract CharArray	`getAcceptedChars()` You can say which characters you can accept.
open Int	`lookup(event: KeyEvent!, content: Spannable!)`
open static Boolean	`ok(accept: CharArray!, c: Char)`

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 BaseKeyListener

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. 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.

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. 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.

Boolean

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

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

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

NumberKeyListener

NumberKeyListener()

Public methods

filter

Added in API level 1

open fun filter(
    source: CharSequence!, 
    start: Int, 
    end: Int, 
    dest: Spanned!, 
    dstart: Int, 
    dend: Int
): CharSequence!

This method is called when the buffer is going to replace the range dstart dend of dest with the new text from the range start end of source. Return the CharSequence that you would like to have placed there instead, including an empty string if appropriate, or null to accept the original replacement. Be careful to not to reject 0-length replacements, as this is what happens when you delete text. Also beware that you should not attempt to make any changes to dest from this method; you may only examine it for context. Note: If source is an instance of Spanned or Spannable, the span objects in the source should be copied into the filtered result (i.e. the non-null return value). TextUtils.copySpansFrom can be used for convenience if the span boundary indices would be remaining identical relative to the source.

onKeyDown

Added in API level 1

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

Handles presses of the meta keys.

Protected methods

getAcceptedChars

Added in API level 1

protected abstract fun getAcceptedChars(): CharArray

You can say which characters you can accept.

Return
`CharArray`	This value cannot be `null`.

lookup

Added in API level 1

protected open fun lookup(
    event: KeyEvent!, 
    content: Spannable!
): Int

ok

Added in API level 1

protected open static fun ok(
    accept: CharArray!, 
    c: Char
): Boolean

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

NumberKeyListener

Summary

Public constructors

NumberKeyListener

Public methods

filter

onKeyDown

Protected methods

getAcceptedChars

lookup

ok

More Android

Discover

Android Devices

Releases

Documentation and Downloads

Support