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    <p><strong>public void afterTextChanged(Editable s)</strong></p> <blockquote> <p>This method is called to notify you that, somewhere within <code>s</code>, the text has been changed. It is legitimate to make further changes to <code>s</code> 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 <code>setSpan(Object, int, int, int)</code> in <code>onTextChanged(CharSequence, int, int, int)</code> to mark your place and then look up from here where the span ended up.</p> </blockquote> <p><strong>public void beforeTextChanged(CharSequence s, int start, int count, int after)</strong></p> <blockquote> <p>This method is called to notify you that, within <code>s</code>, the <code>count</code> characters beginning at <code>start</code> are about to be replaced by new text with length <code>after</code>. It is an error to attempt to make changes to <code>s</code> from this callback.</p> </blockquote> <p><strong>public void onTextChanged(CharSequence s, int start, int before, int count)</strong></p> <blockquote> <p>This method is called to notify you that, within <code>s</code>, the <code>count</code> characters beginning at <code>start</code> have just replaced old text that had length <code>before</code>. It is an error to attempt to make changes to <code>s</code> from this callback.</p> </blockquote> <p>Right from <a href="http://code.google.com/android/reference/android/text/TextWatcher.html" rel="nofollow noreferrer">Android's Reference for TextWatcher</a>.</p>
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