setText for edittext causing crash in addTextChangedListener

Im trying to strip all non standard letter characters from an edittext textbox on an android app im making. I am successfully creating a listener, obtaining the value and removing bad chrs via a regex. however, the .setText line below causes the app to crash. Anyone got any ideas how to get around this and dynamically mask certain chrs?

filenameTextBox.addTextChangedListener(new TextWatcher() { 

    public voi开发者_StackOverflowd onTextChanged(CharSequence s, int start, int before, int count) {

        FILENAME=s.toString();
        FILENAME = FILENAME.replaceAll("[^a-zA-Z]", "");
        filenameTextBox.setText(FILENAME);
   }
}

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Hope this snippet will help you if i understand your problem clearly

        public void afterTextChanged(Editable editable)
        {
            if (editable.length() != 0)
            {
                chatTextArea.removeTextChangedListener(this);
                chatTextArea.setText("your text");
                chatTextArea.addTextChangedListener(this);
            }
        }

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Aren't you creating an infinite loop? You can log each time the handler is called and see how many times it's called.

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public void onTextChanged(CharSequence s, int start, int before, int count)
    {
        chatTextArea.removeTextChangedListener(this);
        String s_new = s.toString().replaceAll("[^0-9]", ""); // for example, if need
        chatTextArea.setText(s_new);
        chatTextArea.setSelection(start + count + s_new.length() - s.length());
        chatTextArea.addTextChangedListener(this);
    }