44. satır bu şekilde

double sayNet = Double.parseDouble(say1.getText().toString())-(Integer.parseInt(say2.getText().toString())/4);

üstüne geldiğimde gözüken yazı böyle

Inspection info: Reports integer division where the result is either directly or indirectly used as a floating point number. Such division is often an error, and may result in unexpected results due to truncation in integer division.