InputFilter.LengthFilter

Page Summary

• InputFilter.LengthFilter is a class in Android that limits the maximum length of text input.

• It uses the filter() method to control text modifications, preventing exceeding the specified length.

• The maximum allowed length is set through the constructor LengthFilter(int max).

• The filter() method examines and modifies text input, ensuring it adheres to the length constraint.

public static class InputFilter.LengthFilter extends Object
implements InputFilter

This filter will constrain edits not to make the length of the text greater than the specified length.

Public Constructor Summary

LengthFilter(int max)

Public Method Summary

CharSequence

filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) 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.

Inherited Method Summary

From class java.lang.Object

Object	clone()
boolean	equals(Object arg0)
void	finalize()
final Class<?>	getClass()
int	hashCode()
final void	notify()
final void	notifyAll()
String	toString()
final void	wait(long arg0, int arg1)
final void	wait(long arg0)
final void	wait()

From interface android.text.InputFilter

abstract CharSequence

filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) 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.

Public Constructors

public LengthFilter (int max)

Parameters

max

Public Methods

public CharSequence filter (CharSequence source, int start, int end, Spanned dest, int dstart, int dend)

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(Spanned, int, int, Class, Spannable, int) can be used for convenience.

Parameters

source
start
end
dest
dstart
dend