up

app/src/main/java/io/legado/app/ui/widget/recycler/RecyclerViewAtViewPager2.kt

@@ -0,0 +1,41 @@
+package io.legado.app.ui.widget.recycler
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.MotionEvent
+import androidx.recyclerview.widget.RecyclerView
+import kotlin.math.abs
+
+class RecyclerViewAtViewPager2(context: Context, attrs: AttributeSet?) :
+    RecyclerView(context, attrs) {
+
+    private var startX: Int = 0
+    private var startY: Int = 0
+
+    override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+        when (ev.action) {
+            MotionEvent.ACTION_DOWN -> {
+                startX = ev.x.toInt()
+                startY = ev.y.toInt()
+                parent.requestDisallowInterceptTouchEvent(true)
+            }
+            MotionEvent.ACTION_MOVE -> {
+                val endX = ev.x.toInt()
+                val endY = ev.y.toInt()
+                val disX = abs(endX - startX)
+                val disY = abs(endY - startY)
+                if (disX > disY) {
+                    parent.requestDisallowInterceptTouchEvent(canScrollHorizontally(startX - endX))
+                } else {
+                    parent.requestDisallowInterceptTouchEvent(canScrollVertically(startY - endY))
+                }
+            }
+            MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> parent.requestDisallowInterceptTouchEvent(
+                false
+            )
+        }
+        return super.dispatchTouchEvent(ev)
+    }
+
+
+}

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

@@ -4,7 +4,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <io.legado.app.ui.widget.recycler.RecyclerViewAtViewPager2
         android:id="@+id/rv_bookshelf"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />