TextWatcher
interface TextWatcher : NoCopySpan
android.text.TextWatcher |
When an object of this type is attached to an Editable, its methods will be called when the text is changed.
Summary
Public methods | |
---|---|
abstract Unit |
afterTextChanged(s: Editable!) This method is called to notify you that, somewhere within |
abstract Unit |
beforeTextChanged(s: CharSequence!, start: Int, count: Int, after: Int) This method is called to notify you that, within |
abstract Unit |
onTextChanged(s: CharSequence!, start: Int, before: Int, count: Int) This method is called to notify you that, within |
Public methods
afterTextChanged
abstract fun afterTextChanged(s: Editable!): Unit
This method is called to notify you that, somewhere within s
, the text has been changed. It is legitimate to make further changes to s
from this callback, but be careful not to get yourself into an infinite loop, because any changes you make will cause this method to be called again recursively. (You are not told where the change took place because other afterTextChanged() methods may already have made other changes and invalidated the offsets. But if you need to know here, you can use Spannable#setSpan
in onTextChanged
to mark your place and then look up from here where the span ended up.
beforeTextChanged
abstract fun beforeTextChanged(
s: CharSequence!,
start: Int,
count: Int,
after: Int
): Unit
This method is called to notify you that, within s
, the count
characters beginning at start
are about to be replaced by new text with length after
. It is an error to attempt to make changes to s
from this callback.
onTextChanged
abstract fun onTextChanged(
s: CharSequence!,
start: Int,
before: Int,
count: Int
): Unit
This method is called to notify you that, within s
, the count
characters beginning at start
have just replaced old text that had length before
. It is an error to attempt to make changes to s
from this callback.