Android : periods not available in keypad to enter in edittext in android

I have a EditText, where I need to enter price. I need to show $ symbol before the digits and two decimal after period(.55) and period should be once. I used the following code. But when I hit "." it doesn't appear in the EditText.

<EditText
                    android:id="@+id/editTextForAddItemPrice"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_marginBottom="20dp"
                 android:inputType="numberDecimal"
                  android:digits="0123456789.,$"
                    android:layout_marginTop="20dp"
                    android:layout_toRightOf="@+id/textForAddItemPrice"
                    android:background="@color/app_bg_color"
                    android:gravity="right"
                    android:textColor="@color/txt_color_gray"
                    android:textSize="17dp" />

editTxtForPrice.addTextChangedListener(new TextWatcher() {
            boolean isEdiging;
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // TODO Auto-generated method stub


            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                    int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable s) {
                // TODO Auto-generated method stub
            //  String sText = editTxtForPrice.getText().toString();
                if(s.length()>0)
                {
                 if(isEdiging) return;
                    isEdiging = true;

                    String str = s.toString().replaceAll( "[^\\d]", "" );
                    if(!str.equals(""))
                    {
                    double s1 = Double.parseDouble(str);

                    NumberFormat nf2 = NumberFormat.getInstance(Locale.ENGLISH);
                    ((DecimalFormat)nf2).applyPattern("$ ###,###.###");
                    s.replace(0, s.length(), nf2.format(s1));


                    }
                    isEdiging = false;  
                    }
            }  
        });