How to change the date format from one format to another in android?

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Android4x

I am assigning date to edittext in dd-MM-yyyy format using datepicker dialog,now before sending my date to database i want to change my date format as yyyy-MM-dd.
i want to send my date as string format.For this conversion i had tried the following code..

SimpleDateFormat inputFormat = new SimpleDateFormat("yyyy-MM-dd");
        String from=fromDateEtxt.getText().toString();
        Date d=new Date();
        try
        {
             d = inputFormat.parse(from);
        }
          catch (ParseException e1)
        {
            e1.printStackTrace();
        }
        String f=inputFormat.format(d);

Thanks