无法解析符号 'listener'

Cannot resolve symbol 'listener'

我的以下代码中出现以下错误 "Cannot resolve symbol 'listener'",但似乎无法摆脱它。关于为什么会出现此错误的任何想法?

        public void onClick(View v) {
        Spinner spr = (Spinner) findViewById(R.id.planspinner);
        EditText editText6 =(EditText) findViewById(R.id.editText6);
        TextView textView8 =(TextView) findViewById(R.id.textView8);

        String selectedItem =(String) spr.getSelectedItem();
        int intItemPosition =spr.getSelectedItemPosition();

        if (selectedItem.trim().equals("*")){
            float result = Float.parseFloat(editText6.getText().toString()) * Float.parseFloat(Integer.toString(planlist.get(intItemPosition).getCalories()));
            textView8.setText(Float.toString(result));
        }

        Button button4 = (Button)findViewById(R.id.button4);
        button4.setOnClickListener(listener);

    }

需要声明的侦听器:

private planOnClickListener myClickListener = new planOnClickListener();

并适当 link 给听众:

Button button4 = (Button)findViewById(R.id.button4);
        button4.setOnClickListener(myClickListener);