Added in API level 1

TextWatcher


public interface TextWatcher
implements NoCopySpan

android.text.TextWatcher
AbsListView Base class that can be used to implement virtualized lists of items. 
ExpandableListView A view that shows items in a vertically scrolling two-level list. 
GridView A view that shows items in two-dimensional scrolling grid. 
ListView

Displays a vertically-scrollable collection of views, where each view is positioned immediatelybelow the previous view in the list. 

PasswordTransformationMethod  
PhoneNumberFormattingTextWatcher This class was deprecated in API level 35. This is a thin wrapper on a `libphonenumber` `AsYouTypeFormatter`; it is recommended to use that instead. 


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 void afterTextChanged(Editable s)

This method is called to notify you that, somewhere within s, the text has been changed.

abstract void beforeTextChanged(CharSequence s, int start, int count, int after)

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.

abstract void onTextChanged(CharSequence s, int start, int before, int count)

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.

Public methods

afterTextChanged

Added in API level 1
public abstract void afterTextChanged (Editable s)

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(CharSequence, int, int, int) to mark your place and then look up from here where the span ended up.

Parameters
s Editable

beforeTextChanged

Added in API level 1
public abstract void beforeTextChanged (CharSequence s, 
                int start, 
                int count, 
                int after)

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.

Parameters
s CharSequence

start int

count int

after int

onTextChanged

Added in API level 1
public abstract void onTextChanged (CharSequence s, 
                int start, 
                int before, 
                int count)

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.

Parameters
s CharSequence

start int

before int

count int