...

app/src/main/java/com/base/pdfviewerscannerwhite/ui/guide/GuideActivity.kt

@@ -54,7 +54,7 @@ class GuideActivity : BaseActivity<ActivityGuideBinding>() {
             //https://www.jianshu.com/p/f69bd30cf5b0
             //FragmentStateAdapter 这里必须传人fragment
             adapter = pageAdapter
-            offscreenPageLimit = 4
+            offscreenPageLimit = 3
         }
         binding.viewPager2.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
 

app/src/main/java/com/base/pdfviewerscannerwhite/ui/guide/GuidePageFragment.kt

 package com.base.pdfviewerscannerwhite.ui.guide
 
 import android.view.View
+import androidx.core.view.isEmpty
 import com.base.pdfviewerscannerwhite.R
 import com.base.pdfviewerscannerwhite.ads.admob.AdmobNativeUtils
 import com.base.pdfviewerscannerwhite.databinding.FragmentGuidePageBinding
@@ -14,6 +15,13 @@ class GuidePageFragment(
         FragmentGuidePageBinding.inflate(layoutInflater)
     }
 
+    override fun onResume() {
+        super.onResume()
+        if (binding.flAd.isEmpty()){
+            AdmobNativeUtils.showNativeAd(requireActivity(), binding.flAd, R.layout.layout_admob_document_in)
+        }
+    }
+
     override fun setView() {
         AdmobNativeUtils.showNativeAd(requireActivity(), binding.flAd, R.layout.layout_admob_document_in)