设置微调器视图文本时出现空指针异常

Question

下面是在微调器中调用 onItemSelected 的代码。有时即使应用程序关闭，我也会收到空指针异常。 bug 的图片附在这个 post.

        /**
         * Store the selected product
         * @param parent
         * @param view
         * @param position
         * @param id
         */
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            QuickListItem selectedSpinnerProduct = productAdapter.getItem(position);

            if (selectedSpinnerProduct != null) {
                mgrApp.storeSharedPrefLong(ConstantsQuickList.SHARED_PREF_PRODUCT_ID,
                        selectedSpinnerProduct.getId());
            }

            SpannableStringBuilder builder = getPendingCallCount(products,
                    selectedSpinnerProduct);

            ((TextView) view).setText(builder, TextView.BufferType.SPANNABLE);

            //Hide the performance tracker as product will change
            ViewProspects.crdvPerformanceTracker.setVisibility(View.GONE);
            populateSalesTracker(typeOfOperation,ConstantsProspects.INVALID_STRING);

        }

Application cashed bug image

Answer 1

如果 selectedSpinnerProduct 为空，您将遇到问题。因此，请在所有地方检查 selectedSpinnerProduct 是否为 null。

 if (selectedSpinnerProduct != null) {
                mgrApp.storeSharedPrefLong(ConstantsQuickList.SHARED_PREF_PRODUCT_ID,
                        selectedSpinnerProduct.getId());
 SpannableStringBuilder builder = getPendingCallCount(products,
                    selectedSpinnerProduct);

            ((TextView) view).setText(builder, TextView.BufferType.SPANNABLE);
            }

设置微调器视图文本时出现空指针异常

Getting null pointer exception when setting spinner view text

android

view

nullpointerexception

spinner