...

app/src/main/java/com/base/browserwhite/ui/activity/result/ResultActivity.kt

@@ -4,7 +4,9 @@ import android.annotation.SuppressLint
 import android.content.Intent
 import android.graphics.Color
 import androidx.activity.addCallback
+import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
+import androidx.recyclerview.widget.LinearLayoutManager
 import com.base.browserwhite.ads.admob.AdmobNativeUtils
 import com.base.browserwhite.bean.ConstObject.APP_PROCESS
 import com.base.browserwhite.bean.ConstObject.JUNK_CLEANER
@@ -88,6 +90,26 @@ class ResultActivity : BaseActivity<ActivityResultBinding>() {
                 finish()
             }
         })
+        binding.rvNews.setOnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->
+//            LogEx.logDebug(TAG, "scrollY=$scrollY oldScrollY=$oldScrollY")
+
+            // 检查当前滚动位置
+            val firstVisibleItem: Int =
+                (binding.rvNews.layoutManager as LinearLayoutManager).findFirstVisibleItemPosition()
+
+            if (firstVisibleItem > 3) {
+                binding.ivUp.isVisible = true
+            }
+
+            if (firstVisibleItem == 0) {
+                binding.ivUp.isVisible = false
+            }
+
+        }
+        binding.ivUp.setOnClickListener {
+            binding.rvNews.scrollToPosition(0)
+            binding.ivUp.isVisible = false
+        }
         binding.rvNews.adapter = helper.adapter
         requestMore()
     }

app/src/main/res/layout/activity_result.xml

@@ -46,11 +46,29 @@
 
     </LinearLayout>
 
-    <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/rv_news"
+    <FrameLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
-        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
+        android:layout_height="match_parent">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/rv_news"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
+
+
+        <ImageView
+            android:id="@+id/iv_up"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="bottom|end"
+            android:layout_marginEnd="30dp"
+            android:layout_marginBottom="50dp"
+            android:src="@mipmap/huidingbu"
+            android:visibility="gone"
+            tools:ignore="ContentDescription" />
+
+    </FrameLayout>
+
 
 </LinearLayout>
\ No newline at end of file