优化

app/src/main/java/io/legado/app/ui/book/read/ReadBookActivity.kt

@@ -164,6 +164,7 @@ class ReadBookActivity : BaseReadBookActivity(),
         binding.cursorRight.setColorFilter(accentColor)
         binding.cursorLeft.setOnTouchListener(this)
         binding.cursorRight.setOnTouchListener(this)
+        window.setBackgroundDrawable(null)
         upScreenTimeOut()
         ReadBook.callBack = this
     }

app/src/main/java/io/legado/app/ui/book/read/page/PageView.kt

@@ -49,8 +49,6 @@ class PageView(context: Context) : FrameLayout(context) {
 
     init {
         if (!isInEditMode) {
-            //设置背景防止切换背景时文字重叠
-            setBackgroundColor(context.getCompatColor(R.color.background))
             upStyle()
         }
         binding.contentTextView.upView = {
@@ -202,7 +200,11 @@ class PageView(context: Context) : FrameLayout(context) {
     }
 
     fun upBg() {
+        if (ReadBookConfig.bgAlpha < 100) {
             binding.vwRoot.backgroundColor = ReadBookConfig.bgMeanColor
+        } else {
+            binding.vwRoot.background = null
+        }
         binding.vwBg.background = ReadBookConfig.bg
         upBgAlpha()
     }

app/src/main/java/io/legado/app/ui/book/read/page/ReadView.kt

@@ -26,6 +26,7 @@ import io.legado.app.ui.book.read.page.entities.TextPos
 import io.legado.app.ui.book.read.page.provider.ChapterProvider
 import io.legado.app.ui.book.read.page.provider.TextPageFactory
 import io.legado.app.utils.activity
+import io.legado.app.utils.invisible
 import io.legado.app.utils.screenshot
 import java.text.BreakIterator
 import java.util.*
@@ -97,6 +98,8 @@ class ReadView(context: Context, attrs: AttributeSet) :
         addView(nextPage)
         addView(curPage)
         addView(prevPage)
+        nextPage.invisible()
+        prevPage.invisible()
         if (!isInEditMode) {
             upBg()
             setWillNotDraw(false)

app/src/main/java/io/legado/app/ui/book/read/page/delegate/CoverPageDelegate.kt

@@ -5,6 +5,7 @@ import android.graphics.Matrix
 import android.graphics.drawable.GradientDrawable
 import io.legado.app.ui.book.read.page.ReadView
 import io.legado.app.ui.book.read.page.entities.PageDirection
+import io.legado.app.utils.screenshot
 
 class CoverPageDelegate(readView: ReadView) : HorizontalPageDelegate(readView) {
     private val bitmapMatrix = Matrix()
@@ -30,18 +31,46 @@ class CoverPageDelegate(readView: ReadView) : HorizontalPageDelegate(readView) {
 
         val distanceX = if (offsetX > 0) offsetX - viewWidth else offsetX + viewWidth
         if (mDirection == PageDirection.PREV) {
+            if (offsetX <= viewWidth) {
                 bitmapMatrix.setTranslate(distanceX, 0.toFloat())
-            curBitmap?.let { canvas.drawBitmap(it, 0f, 0f, null) }
                 prevBitmap?.let { canvas.drawBitmap(it, bitmapMatrix, null) }
                 addShadow(distanceX.toInt(), canvas)
+            } else {
+                prevBitmap?.let { canvas.drawBitmap(it, 0f, 0f, null) }
+            }
         } else if (mDirection == PageDirection.NEXT) {
             bitmapMatrix.setTranslate(distanceX - viewWidth, 0.toFloat())
-            nextBitmap?.let { canvas.drawBitmap(it, 0f, 0f, null) }
+            nextBitmap?.let {
+                canvas.apply {
+                    save()
+                    val width = it.width.toFloat()
+                    val height = it.height.toFloat()
+                    clipRect(width + offsetX, 0f, width, height)
+                    drawBitmap(it, 0f, 0f, null)
+                    restore()
+                }
+            }
             curBitmap?.let { canvas.drawBitmap(it, bitmapMatrix, null) }
             addShadow(distanceX.toInt(), canvas)
         }
     }
 
+    override fun setBitmap() {
+        when (mDirection) {
+            PageDirection.PREV -> {
+                prevBitmap?.recycle()
+                prevBitmap = prevPage.screenshot()
+            }
+            PageDirection.NEXT -> {
+                nextBitmap?.recycle()
+                nextBitmap = nextPage.screenshot()
+                curBitmap?.recycle()
+                curBitmap = curPage.screenshot()
+            }
+            else -> Unit
+        }
+    }
+
     private fun addShadow(left: Int, canvas: Canvas) {
         if (left < 0) {
             shadowDrawableR.setBounds(left + viewWidth, 0, left + viewWidth + 30, viewHeight)

app/src/main/java/io/legado/app/ui/book/read/page/delegate/HorizontalPageDelegate.kt

@@ -17,7 +17,7 @@ abstract class HorizontalPageDelegate(readView: ReadView) : PageDelegate(readVie
         setBitmap()
     }
 
-    private fun setBitmap() {
+    open fun setBitmap() {
         when (mDirection) {
             PageDirection.PREV -> {
                 prevBitmap?.recycle()

app/src/main/java/io/legado/app/ui/book/read/page/delegate/NoAnimPageDelegate.kt

@@ -2,9 +2,14 @@ package io.legado.app.ui.book.read.page.delegate
 
 import android.graphics.Canvas
 import io.legado.app.ui.book.read.page.ReadView
+import io.legado.app.ui.book.read.page.entities.PageDirection
 
 class NoAnimPageDelegate(readView: ReadView) : HorizontalPageDelegate(readView) {
 
+    override fun setDirection(direction: PageDirection) {
+        mDirection = direction
+    }
+
     override fun onAnimStart(animationSpeed: Int) {
         if (!isCancel) {
             readView.fillPage(mDirection)