android - 无法在 onclick 方法中访问变量

Question

我正在设置一个 onclick 方法，但我无法访问我在其父方法中设置的 int，是否有不同的方法来使用 Int？

这是代码：

Date past = new Date(cYear, cMonth, cDay); // current Date
    Date today = new Date(mYear, mMonth, mDay); // date Choosen by the user
    int days = Days.daysBetween(new DateTime(past), new DateTime(today)).getDays()+1;
    mDateDisplay.setText(""+days);
    // display the current date (this method is below)
   updateDisplay();

    mButton.setOnClickListener(
        new View.OnClickListener()
        {
            public void onClick(View view)
            {
               s = WorkoutChoice.this.weight.getText().toString();
               s2 = WorkoutChoice.this.height.getText().toString();
               int w = Integer.parseInt(s);
               double h = Double.parseDouble(s2);
               double BMI = (w/h)/h;
               t.setText(""+BMI);
               id = db.insertTitle("001", ""+days, ""+BMI)
            }
        });

Answer 1

为了从内部类中引用变量，您需要创建变量final：

final int days = Days.daysBetween(new DateTime(past), new DateTime(today)).getDays()+1;