替换edittext textwatch问题中的选定文本

Question

edittext1.addTextChangedListener（new TextWatcher（）{

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        selStart = edittext1.getSelectionStart();
        selEnd= edittext1.getSelectionEnd();
        lengthBefore = edittext1.getText().toString().length();
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

    @Override
    public void afterTextChanged(Editable s) {

        int lengthAfter = edittext1.getText().toString().length() - lengthBefore;


        if(!(lengthAfter < 0))
        {
            String codedBefore = editTextCoded.getText().toString().substring(0, selStart);
            String codedAfter;
            if(selEnd>1) {
                codedAfter = editTextCoded.getText().toString().substring(selEnd);
            }
            else
            {
                codedAfter = "";
            }
            editTextCoded.setText(codedBefore);

            //Zakodowanie nowego

            String toBeCoded = edittext1.getText().toString().substring(selStart, selEnd+ lengthAfter);
            for(int i=0; i<toBeCoded.length(); i++)
            {
                newChar = toBeCoded.charAt(i);

                    editTextCoded.setText(editTextCoded.getText().toString() + Character.toString(newChar));
            }

            //Dopisanie końcówki tłumaczenia
            editTextCoded.setText(editTextCoded.getText().toString() + codedAfter);

        }
        else
        {
            String codedBefore = editTextCoded.getText().toString().substring(0, selStart + lengthAfter);
            String codedAfter = editTextCoded.getText().toString().substring(selStart, editTextCoded.length());

            editTextCoded.setText(codedBefore + codedAfter);

        }
    }

});

在此操作之后，editTextCoded和edittext1应该显示相同的文本，但是当我复制部分文本，然后选择另一个（较小的）部分并粘贴它替换所选部分时，editTextCoded和edittext1中的文本会有所不同。

任何人都可以帮助我吗？我不知道如何处理它。