代码看起来像这样：

protected void onResume()
    {   
        super.onResume();

        Calendar expirationDate = Calendar.getInstance();
        expirationDate.set(2009,7,3);  //hardcoded expiration date
        Calendar t = Calendar.getInstance();  //Calendar with current time/date
        if (t.compareTo(expirationDate) == 1)
           finish();
    }