public void calculate(View view) { EditText flyingDistanceTextBox = (EditText) findViewById(R.id.flyingdistancecourseFlyingDistanceOutput); EditText courseTextBox = (EditText) findViewById(R.id.flyingdistancecourseCourse_2); double flyingDistance = 0; double course = 0; Distance d = new Distance(); flyingDistance = Calculation.calcFlyDis(airportOneChoice, airportTwoChoice); course = Calculation.calcCourBwAir(airportOneChoice, airportTwoChoice); if (distanceUnitChoice.equalsIgnoreCase("SM")) { flyingDistance = d.kilomToStat(flyingDistance); flyingDistanceTextBox.setText((String.format("%.2f", flyingDistance))); } else if (distanceUnitChoice.equalsIgnoreCase("NM")) { flyingDistance = d.kilomToNaut(flyingDistance); flyingDistanceTextBox.setText((String.format("%.2f", flyingDistance))); } else { flyingDistanceTextBox.setText((String.format("%.2f", flyingDistance))); } courseTextBox.setText(String.format("%.2f", course)); }