...

app/src/main/java/com/base/browserwhite/ui/fragment/HomeFragment.kt

@@ -8,6 +8,7 @@ import android.view.inputmethod.EditorInfo.IME_ACTION_DONE
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.isVisible
 import com.base.browserwhite.R
 import com.base.browserwhite.bean.ConstObject
 import com.base.browserwhite.bean.ConstObject.BAIDU
@@ -44,6 +45,7 @@ import java.net.MalformedURLException
 import java.net.URL
 import java.net.URLEncoder
 import java.nio.charset.StandardCharsets
+import kotlin.math.abs
 
 
 class HomeFragment : BaseFragment<FragmentHomeBinding>() {
@@ -108,6 +110,12 @@ class HomeFragment : BaseFragment<FragmentHomeBinding>() {
         })
 
         binding.rv.adapter = helper.adapter
+        binding.rv.setOnScrollChangeListener { v, scrollX, scrollY, oldScrollX, oldScrollY ->
+            LogEx.logDebug(TAG, "scrollY=$scrollY oldScrollY=$oldScrollY")
+            if (!binding.ivUp.isVisible && abs(oldScrollY) > 35) {
+                binding.ivUp.isVisible = true
+            }
+        }
         requestMore()
     }
 
@@ -286,6 +294,10 @@ class HomeFragment : BaseFragment<FragmentHomeBinding>() {
 
             NotificationUtil.sendNotification(requireContext(), ConstObject.ID_NEWS)
         }
+        binding.ivUp.setOnClickListener {
+            binding.rv.scrollToPosition(0)
+            binding.ivUp.isVisible = false
+        }
 
     }
 

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

@@ -184,7 +184,19 @@
             android:layout_height="wrap_content"
             app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" />
 
+
     </LinearLayout>
 
 
+    <ImageView
+        android:id="@+id/iv_up"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="end|bottom"
+        android:layout_marginEnd="8dp"
+        android:layout_marginBottom="50dp"
+        android:src="@mipmap/huidingbu"
+        android:visibility="gone"
+        tools:ignore="ContentDescription" />
+
 </androidx.coordinatorlayout.widget.CoordinatorLayout>
\ No newline at end of file