Java - error funcion OnChange

public class crear extends AppCompatActivity {

    EditText cantidad, precio, comision;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_crear);

        cantidad = findViewById(R.id.cantidad);

        precio = findViewById(R.id.precio);

        comision = findViewById(R.id.comision);

        cantidad.addTextChangedListener(new TextWatcher() {

            public void afterTextChanged(Editable s) {

                String cant = cantidad.getText().toString();

                String price = precio.getText().toString();

                int c = Integer.parseInt(cant);

                int p = Integer.parseInt(price);

                double com = c*p*0.958;

                String cTotal = String.valueOf(com);

                comision.setText(cTotal);

            }

            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            public void onTextChanged(CharSequence s, int start, int before, int count) {}

        });

    }

}