Question

我的xml中有3个微调器..

1. one is Product Name
2. one is Product Quantity.
3. and 3rd one is Discount

现在，我为每一个调用单独的Listener ..问题是我想使用项目数量来计算最终价格，我在所有的同一序列中调用了微调器，这是我写的名称，数量和折扣..

数量的听众最后被调用，即使我在上面写了折扣Spinner ..我不知道发生了什么..可能有人遇到过这个问题......请帮助我..

这是我的Spinner听众： -

spnSelectItem.setOnItemSelectedListener(new OnItemSelectedListener() 
        {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3)
            {
                strItem=spnSelectItem.getItemAtPosition(arg2).toString();           }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }
        });

          ///This method called last..
        spnQty.setOnItemSelectedListener(new OnItemSelectedListener() 
        {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3)
            {
                strQty=spnQty.getItemAtPosition(arg2).toString();

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }
        });
     ///This method called before spnQty ..
     spnItemDiscount.setOnItemSelectedListener(new OnItemSelectedListener()
        {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) 
            {
                disc=round(Double.parseDouble(spnItemDiscount.getItemAtPosition(arg2).toString().replace("%", "")));

            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

            }
        });

Answer 1

为什么不创建一个单独的方法来执行所有这样的计算：

private void calculatePrice() {
        String strItem = spnSelectItem.getSelectedItem().toString();
        String qty = spnQty.getSelectedItem().toString();
        String discount = spnItemDiscount.getSelectedItem().toString().replace("%", "");

        //perform calculate and update UI as you like
    }

然后为所有三个微调器创建一个侦听器，或者在所有三个微调器中调用它们，例如：

spnSelectItem.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {

            //do some work, update UI or reset qty and discount spinner or whatever
            strItem = spnSelectItem.getItemAtPosition(arg2).toString();

            //call calulcate method
            calculatePrice();
        }
    });

Android问题中的Spinner OnItemSelectedListener方法

1 个答案: