Merge pull request #1006 from gongym12138/master

修复上下滑动会导致左右切换问题，添加了新的自定义组件RecyclerViewAtViewPager2

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

@@ -0,0 +1,40 @@
+package io.legado.app.ui.widget
+
+import android.content.Context
+import androidx.recyclerview.widget.RecyclerView
+import android.util.AttributeSet
+import android.view.MotionEvent
+import kotlin.math.abs
+
+class RecyclerViewAtViewPager2 : RecyclerView {
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
+
+    private var startX = 0
+    private var startY = 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) {
+                    if (disX > 50) {
+                        parent.requestDisallowInterceptTouchEvent(false)
+                    }
+                } else {
+                    parent.requestDisallowInterceptTouchEvent(true)
+                }
+            }
+            MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> parent.requestDisallowInterceptTouchEvent(false)
+        }
+        return super.dispatchTouchEvent(ev)
+    }
+}

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

@@ -9,7 +9,7 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent">
 
-        <androidx.recyclerview.widget.RecyclerView
+        <io.legado.app.ui.widget.RecyclerViewAtViewPager2
             android:id="@+id/rv_bookshelf"
             android:layout_width="match_parent"
             android:layout_height="match_parent"

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

@@ -15,7 +15,7 @@
         app:layout_constraintTop_toTopOf="parent"
         app:title="@string/discovery" />
 
-    <androidx.recyclerview.widget.RecyclerView
+    <io.legado.app.ui.widget.RecyclerViewAtViewPager2
         android:id="@+id/rv_find"
         android:layout_width="match_parent"
         android:layout_height="0dp"

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

@@ -15,7 +15,7 @@
         app:layout_constraintTop_toTopOf="parent"
         app:title="@string/rss" />
 
-    <androidx.recyclerview.widget.RecyclerView
+    <io.legado.app.ui.widget.RecyclerViewAtViewPager2
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"
         android:layout_height="0dp"

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

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