java - 更改局部变量 android onClickListener

Question

我需要将此方法的返回值设置为在单选对话框中选择的项目...

但是，我无法设置 retVal 的值，因为它显然需要是最终值(因此无法更改)

有没有不用全局变量的方法呢？

private String getSaleType()
{
    String retVal = "";
    final String[] TYPES = {"Cash Sale", "Sales Order"};
    AlertDialog.Builder choose = null;

    try
    {
        choose = new AlertDialog.Builder(this);
        choose.setIcon(R.drawable.firstdroidicon);
        choose.setTitle("Sale Type");
        choose.setMessage("Type Of Sale?");
        choose.setSingleChoiceItems(TYPES, currentItem, new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                Log.i("Selected", TYPES[which]);
            }
        });
        choose.setPositiveButton("OK", new DialogInterface.OnClickListener()
        {
            @Override
            public void onClick(DialogInterface dialog, int which)
            {
                retVal = TYPES[which];
            }
        });

    }
    catch(Exception e)
    {
        messageBox("getSaleType", e.getMessage());
    }

    return retVal;
}

Answer 1

不可能。

您可以在 JLS # chapter 8 中找到它

Any local variable, formal parameter, or exception parameter used but not declared in an inner class must be declared final.

Any local variable used but not declared in an inner class must be definitely assigned (§16) before the body of the inner class.