修改过期方法viewPager

app/src/main/java/io/legado/app/ui/main/MainActivity.kt

@@ -3,12 +3,11 @@ package io.legado.app.ui.main
 import android.os.Bundle
 import android.view.KeyEvent
 import android.view.MenuItem
-import android.view.ViewGroup
 import androidx.activity.viewModels
 import androidx.fragment.app.Fragment
-import androidx.fragment.app.FragmentManager
-import androidx.fragment.app.FragmentStatePagerAdapter
 import androidx.viewpager.widget.ViewPager
+import androidx.viewpager2.adapter.FragmentStateAdapter
+import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.bottomnavigation.BottomNavigationView
 import io.legado.app.BuildConfig
 import io.legado.app.R
@@ -43,7 +42,7 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
     private var bookshelfReselected: Long = 0
     private var exploreReselected: Long = 0
     private var pagePosition = 0
-    private val fragmentMap = hashMapOf<Int, Fragment>()
+    private val fragmentMap = hashMapOf<Long, Fragment>()
 
     override fun getViewBinding(): ActivityMainBinding {
         return ActivityMainBinding.inflate(layoutInflater)
@@ -53,8 +52,12 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
         ATH.applyEdgeEffectColor(viewPagerMain)
         ATH.applyBottomNavigationColor(bottomNavigationView)
         viewPagerMain.offscreenPageLimit = 3
-        viewPagerMain.adapter = TabFragmentPageAdapter(supportFragmentManager)
-        viewPagerMain.addOnPageChangeListener(this@MainActivity)
+        viewPagerMain.adapter = TabFragmentPageAdapter()
+        viewPagerMain.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
+            override fun onPageSelected(position: Int) {
+                this@MainActivity.onPageSelected(position)
+            }
+        })
         bottomNavigationView.elevation =
             if (AppConfig.elevation < 0) elevation else AppConfig.elevation.toFloat()
         bottomNavigationView.setOnNavigationItemSelectedListener(this@MainActivity)
@@ -105,6 +108,10 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
         }
     }
 
+    fun getViewPager(): ViewPager2 {
+        return binding.viewPagerMain
+    }
+
     private fun upVersion() {
         if (LocalConfig.versionCode != appInfo.versionCode) {
             LocalConfig.versionCode = appInfo.versionCode
@@ -186,36 +193,29 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
         }
     }
 
-    private inner class TabFragmentPageAdapter(fm: FragmentManager) :
-        FragmentStatePagerAdapter(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT) {
+    private inner class TabFragmentPageAdapter :
+        FragmentStateAdapter(this) {
 
-        private fun getId(position: Int): Int {
+        override fun getItemId(position: Int): Long {
             return when (position) {
                 2 -> if (AppConfig.isShowRSS) 2 else 3
-                else -> position
+                else -> position.toLong()
             }
         }
 
-        override fun getItemPosition(`object`: Any): Int {
-            return POSITION_NONE
+        override fun getItemCount(): Int {
+            return if (AppConfig.isShowRSS) 4 else 3
         }
 
-        override fun getItem(position: Int): Fragment {
-            return when (getId(position)) {
-                0 -> BookshelfFragment()
-                1 -> ExploreFragment()
-                2 -> RssFragment()
+        override fun createFragment(position: Int): Fragment {
+            val id = getItemId(position)
+            val fragment = when (id) {
+                0L -> BookshelfFragment()
+                1L -> ExploreFragment()
+                2L -> RssFragment()
                 else -> MyFragment()
             }
-        }
-
-        override fun getCount(): Int {
-            return if (AppConfig.isShowRSS) 4 else 3
-        }
-
-        override fun instantiateItem(container: ViewGroup, position: Int): Any {
-            val fragment = super.instantiateItem(container, position) as Fragment
-            fragmentMap[getId(position)] = fragment
+            fragmentMap[id] = fragment
             return fragment
         }
 

app/src/main/java/io/legado/app/ui/main/bookshelf/RootView.kt

@@ -0,0 +1,88 @@
+package io.legado.app.ui.main.bookshelf
+
+import android.content.Context
+import android.gesture.GestureOverlayView.ORIENTATION_HORIZONTAL
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.View
+import android.view.ViewConfiguration
+import android.widget.LinearLayout
+import androidx.viewpager2.widget.ViewPager2
+import io.legado.app.R
+import io.legado.app.ui.main.MainActivity
+import io.legado.app.utils.activity
+import kotlin.math.absoluteValue
+import kotlin.math.sign
+
+class RootView : LinearLayout {
+
+    constructor(context: Context) : super(context)
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+
+    private var touchSlop = 0
+    private var initialX = 0f
+    private var initialY = 0f
+
+    private val parentViewPager: ViewPager2
+        get() {
+            return (activity as MainActivity).getViewPager()
+        }
+
+    private val childViewPager: View get() = findViewById(R.id.view_pager_bookshelf)
+
+    init {
+        touchSlop = ViewConfiguration.get(context).scaledTouchSlop
+    }
+
+    private fun canChildScroll(orientation: Int, delta: Float): Boolean {
+        val direction = -delta.sign.toInt()
+        return when (orientation) {
+            0 -> childViewPager.canScrollHorizontally(direction)
+            1 -> childViewPager.canScrollVertically(direction)
+            else -> throw IllegalArgumentException()
+        }
+    }
+
+    override fun onInterceptTouchEvent(e: MotionEvent): Boolean {
+        handleInterceptTouchEvent(e)
+        return super.onInterceptTouchEvent(e)
+    }
+
+    private fun handleInterceptTouchEvent(e: MotionEvent) {
+        val orientation = parentViewPager.orientation
+        // Early return if child can't scroll in same direction as parent
+        if (!canChildScroll(orientation, -1f) && !canChildScroll(orientation, 1f)) {
+            return
+        }
+
+        if (e.action == MotionEvent.ACTION_DOWN) {
+            initialX = e.x
+            initialY = e.y
+            parent.requestDisallowInterceptTouchEvent(true)
+        } else if (e.action == MotionEvent.ACTION_MOVE) {
+            val dx = e.x - initialX
+            val dy = e.y - initialY
+            val isVpHorizontal = orientation == ORIENTATION_HORIZONTAL
+            // assuming ViewPager2 touch-slop is 2x touch-slop of child
+            val scaledDx = dx.absoluteValue * if (isVpHorizontal) .5f else 1f
+            val scaledDy = dy.absoluteValue * if (isVpHorizontal) 1f else .5f
+
+            if (scaledDx > touchSlop || scaledDy > touchSlop) {
+
+                if (isVpHorizontal == (scaledDy > scaledDx)) {
+                    // Gesture is perpendicular, allow all parents to intercept
+                    parent.requestDisallowInterceptTouchEvent(false)
+                } else {
+                    // Gesture is parallel, query child if movement in that direction is possible
+                    if (canChildScroll(orientation, if (isVpHorizontal) dx else dy)) {
+                        // Child can scroll, disallow all parents to intercept
+                        parent.requestDisallowInterceptTouchEvent(true)
+                    } else {
+                        // Child cannot scroll, allow all parents to intercept
+                        parent.requestDisallowInterceptTouchEvent(false)
+                    }
+                }
+            }
+        }
+    }
+}

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

@@ -5,7 +5,7 @@
     android:layout_height="match_parent"
     android:orientation="vertical">
 
-    <androidx.viewpager.widget.ViewPager
+    <androidx.viewpager2.widget.ViewPager2
         android:id="@+id/view_pager_main"
         android:layout_width="match_parent"
         android:layout_height="0dp"

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

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<io.legado.app.ui.main.bookshelf.RootView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -10,12 +10,12 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:attachToActivity="false"
-        app:title="@string/bookshelf"
-        app:contentLayout="@layout/view_tab_layout_min" />
+        app:contentLayout="@layout/view_tab_layout_min"
+        app:title="@string/bookshelf" />
 
     <androidx.viewpager2.widget.ViewPager2
         android:id="@+id/view_pager_bookshelf"
         android:layout_width="match_parent"
         android:layout_height="match_parent" />
 
-</LinearLayout>
+</io.legado.app.ui.main.bookshelf.RootView>