fix SHQBD-522 商品管理点击tab切换页面时自动刷新列表

Components/commodity/src/main/java/com/yidian/shenghuoquan/commodity/ui/coupon/CommodityManagementActivity.kt

@@ -49,22 +49,15 @@ class CommodityManagementActivity : BaseMvvmActivity<CommodityActivityCommodityM
           return CommodityListFragment(it[position])
         }
       }
-      // ViewPager2设置离屏加载页面数量
-      binding.vpCommodityList.offscreenPageLimit = 1
-
-      // TabLayout与ViewPager2绑定
-      TabLayoutMediator(
-        binding.tlCommodityList, binding.vpCommodityList
-      ) { tab, position ->
-        tab.text = it[position].name
-      }.attach()
 
       // TabLayout设置tab切换监听
-      // 此监听放在TabLayout与ViewPager2绑定之后 则不会自动回调第一个tab的onTabSelected方法
       binding.tlCommodityList.addOnTabSelectedListener(object : TabLayout.OnTabSelectedListener {
         override fun onTabSelected(tab: TabLayout.Tab?) {
           // 刷新商品列表
-          (supportFragmentManager.findFragmentByTag("f${tab?.position}") as CommodityListFragment).refreshCommodityList()
+          // 判空处理对应fragment未创建的情况
+          supportFragmentManager.findFragmentByTag("f${tab?.position}")?.let { fragment ->
+            (fragment as CommodityListFragment).refreshCommodityList()
+          }
         }
 
         override fun onTabUnselected(tab: TabLayout.Tab?) {
@@ -77,6 +70,13 @@ class CommodityManagementActivity : BaseMvvmActivity<CommodityActivityCommodityM
 
       })
 
+      // TabLayout与ViewPager2绑定
+      TabLayoutMediator(
+        binding.tlCommodityList, binding.vpCommodityList
+      ) { tab, position ->
+        tab.text = it[position].name
+      }.attach()
+
       // 记录审核中页面下标
       it.forEachIndexed { index, commodityStatus ->
         if (commodityStatus.tabId == ID_COMMODITY_AUDIT) {