Avoiding backspace in EditText afterTextChanged() method

Question

So, I have implemented a simple replace method that replaces a character just before where the text is changed.

 @Override
 public void afterTextChanged(Editable s) {

     editText.removeTextChangedListener(this);

     if (s.length() == 0)
       return;
       s.replace(editText.getSelectionStart(),editText.getSelectionStart()+1,"PP");

     editText.addTextChangedListener(this);
}

Since this is effective for all kind of text change, It adds the "PP" even I press the back space button. Is there any way to exclude backspace from this?

Answer 1

First detect Backspace pressed or not

then avoid your replace when backspace pressed

editText.addTextChangedListener(new TextWatcher() {

        //Normally assume that Backspace not pressed 
        boolean isNotBackspace = true;

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            //if current count is grater then before that means char added
            //So if current count is smaller then before that means backspace pressed 
            isNotBackspace = count>before;
        }

        @Override
        public void afterTextChanged(Editable s) {

            editText.removeTextChangedListener(this);
            Log.e("isNotBackButton", isNotBackButton+"");

            if (s.length() == 0) {
                //Edit is here 
                //return; //need to block return; because this preventing
                //from adding  adding addTextChangedListener
                isNotBackButton = true;
            //if not backspace pressed then proceed else no action 
            }else if(isNotBackButton){
                s.replace(editText.getSelectionStart(), editText.getSelectionEnd(), "PP");
            }

            editText.addTextChangedListener(this);

        }
 });