Android java math prob

Question

i have the following code. Whenever try to use numbers with decimals on my app crashes. I know is something wrong with my final result but whats wrong???

    b1.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            String f = et1.getText().toString();
            int i = Integer.parseInt(f);
            String s = et2.getText().toString();
            int j = Integer.parseInt(s);
            String w = et4.getText().toString();
            int q = Integer.parseInt(s);
            int price_gold = 10;

            int fpa = 10;
            int fpol = 10;
            int isot = 10;
            int sint_ker = 10;
            Integer result1 = (i * price_gold) + (j * 1000) + (q * isot);
            result = result1 / 340;

            String res = result.toString();
            et3.setText(res);
        }
    }

Answer 1

You should use Float.parseFloat but be careful of empty text, something like the following

String f = et1.getText().toString();
if (!TextUtils.isEmpty(f)) {
    Float i = Float.parseFloat(f);
}

Answer 2

if you want to have integer output as your answer, have all your values except result1 as doubles, much easier check below:

b1.setOnClickListener(new OnClickListener() {

    @Override

    public void onClick(View v) {

        String f = et1.getText().toString();

        double i = Double.parseDouble(f);

        String s = et2.getText().toString();

        double j = Double.parseDouble(s);

        String w = et4.getText().toString();

        double q = Double.parseDouble(s);

        double price_gold = 10;


        double fpa = 10;

        double fpol = 10;

        double isot = 10;

        double sint_ker = 10;

        Integer result1 = ((int)i * price_gold) + ((int)j * 1000) + ((int)q * isot);

        result = result1 / 340;

        String res = String.valueOf(result);

        et3.setText(res);
    }

This code should then give you your integer values you are looking for, Easy :)