...

app/src/main/java/com/base/scanqr/ui/main/HistoryFragment.kt

@@ -21,6 +21,7 @@ import com.base.scanqr.ui.widget.HistoryMoreDialog.showHistoryMoreDialog
 import com.base.scanqr.ui.widget.SortByDialog.showSortByDialog
 import com.base.scanqr.ui.wifi.WifiCodeActivity
 import com.base.scanqr.utils.BarUtils
+import com.base.scanqr.utils.CollectionEx.addStepElements
 import com.base.scanqr.utils.LogEx
 import com.google.gson.Gson
 import com.gyf.immersionbar.ktx.immersionBar
@@ -167,11 +168,8 @@ class HistoryFragment : BaseFragment<FragmentHistoryBinding>(FragmentHistoryBind
             val qrState = if (isCreateOrScan) 0 else 1
             val createList = viewModel.historyList.filter { it.createType == qrState }
             binding.llEmpty.isVisible = createList.isEmpty()
-            val sortList = sortList(createList).toMutableList()
-            if (sortList.size >= 3) {
-                sortList.add(2, AdScanBean())
-            }
-            adapter?.submitList(sortList)
+            val sortList = sortList(createList)
+            adapter?.submitList(sortList.addStepElements { AdScanBean() })
         }
         if (viewModel.dataRefreshFinish.get()) {
             uiRefresh.invoke()

app/src/main/java/com/base/scanqr/utils/CollectionEx.kt

+package com.base.scanqr.utils
+
+object CollectionEx {
+
+    fun <T> List<T>.addStepElements(beanStep: Int = 3, newElement: () -> T): MutableList<T> {
+        val chunkedList = this.chunked(beanStep)
+        val newList = mutableListOf<T>()
+        chunkedList.forEach {
+            newList.addAll(it)
+            newList.add(newElement())
+        }
+        return newList
+    }
+}
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